science-help

[cyan prairie]

Plz solve this q ans js opt b

[slim hemlock]

A genetic counselor can also use the principles of population genetics in his advising. What is the basis for this type of counseling?

can anyone help me

[novel badger]

I tried 😅 but in vain
Please let me know if you get it

[cyan prairie]

okk

[hybrid rose]

Use kirchoff's law (KVL mainly)

And use I as dq/dt and solve for q

Once you get q , differentiate w.r.t time and you will get current in the circuit

[cyan prairie]

hey, could u plz snd the sol as well coz one of my frnd tried this n he's getting + sign in the power, n there's a lot of confusion

[hybrid rose]

Hmmm

Ok I'll try it later

[carmine pagoda]

How do u derive and explain how zinc hydroxide is formed?

[rancid badge]

Hi!! I can't find information about this question):
Translation:
Research and respond.
What is the difference, based on solubility, between sulfate and nitrate salts?

[novel geode]

Could someone tell me how would I solve this question?

The solution was B but I don't know how to get there.

[weary wasp]

all nitrate salts are soluble with no exceptions. Sulfate salts are also quite soluble except for mercury, barium, lead sulfates

[weary wasp]

the ratio between orbital periods (year length) is equal to the 3/2th power of the ratio between the average orbit radii according to kepler's laws.

[novel geode]

Wait, so how is it 1.8 earth years then?

[heady shell]

Can anyone suggest me a good youtube play list on Periodic table?

[novel geode]

Nvm I got what you meant, thanks for the help!

[hybrid rose]

Yes am getting B

Will send solution after sometime

[hybrid rose]

Just use KVL & solve

[hybrid rose]

@cyan prairie I hope it clears your doubt

[thick carbon]

Some good websites containing notes?

[cyan prairie]

@hybrid rose thanks a lot , @novel badger

[hybrid rose]

Np

[floral depot]

What is the best way to study computer science (Python) I am taking an intro class next semester and have already started learning python on my own a little bit at a time. But I was wondering when it comes to a class what's the best way to study computer science? Is it just by constantly writing code or are flashcards helpful or what? Thanks!

[modest oracle]

Learn how to use your IDE (the program you use to write codes)
Learn the basics (built-in types, variables, math operators, comments, built-in functions, built-in methods, logical operators, loops, writing functions, importing modules, writing classes, conventions for well-written programs).
Get comfortable with using documentation on the internet. Knowing all functions and methods by heart is impossible, so you must be able to use the docs to find a function or the way it works.
Learn some basic built-in methods (len, find,index,split, join, keys,..)
Spend much time actually writing programs, and fix their bugs until they work perfectly. Practice makes perfect. Use the internet when needed. ALWAYS make sure your program works with extreme cases (ie. you use a list as the parameter of your function instead of an int).

If you wish, I can give you the link of my professor's website, which contains theory and exercises

(Also, I think that question belongs more to #tech-related-help)

[quartz zealot]

I found the best way for me is (when taking courses) to read the assigned literature (usually one or two chapters from the textbook), and then do the assignments given, starting with sketching some figures (f.ex. what functions call each other, data structures, etc). Also it's often helpful to write testing functions that check that your functions yield the correct outputs for some given inputs

[thorny gyro]

can anyone pls explain what is dominant recessive epistasis in non mendelian inheritance?

[wet trench]

A spherical mirror produces an image of magnification -1 on a screen placed at a distance of 50cm from the mirror. Mention the type of mirror and find the distance of the image from the object.

[hybrid rose]

Concave mirror ,& use mirror formula to calculate image distance , Focal length would be 25cm

@wet trench

[wet trench]

How do u know the focal length is 25cm, plz explain

[hybrid rose]

When the object is placed as centre of curvature then it's image size is equal to the object size

@wet trench

And as magnification is given as '-1' it means that the size is same but it's inverted , so it's concave mirror

[wet trench]

Got it. Thx a lot @hybrid rose

[sudden loom]

Hi everyone! I'm a med biotech student and I'm in need of help with haematology/blood banking. A critical information lacking in the picture would be that the patient was transfused with irradiated blood products of packed rbc, platelets, FFP and cryoprecipitate only on the second transfusion. Could transfusion-associated graft versus host disease still happen with compatible irradiated blood products transfused into a immunocompromised patient? Also, could results of the reverse grouping be caused by the production of ABO antibodies by the B cells of the engrafted bone marrow typed O+? My team and I are in need of serious help with the explanation of the progression of his situation so any help would be very much appreciated 😭 DMs are welcome!!

[thorny gyro]

Because velocity ratio is the ratio of two distances and it is not affected my friction which makes it constant in all machines.

[boreal adder]

hello guys anyone know about Developed approaches for using induced pluripotent stem cells for in vitro modeling?

[woeful talon]

Thanks 😊

[thorny gyro]

help with ques 25 pls

[hybrid rose]

C

K = Ae^(-Ea/RT) , lnk = ln A - Ea/Rt

differentiate & you will get C

[thorny gyro]

got it thank youuu

[thorny gyro]

help

[stray umbra]

How to integrate this further?

In the solution they multiplied it with (b-a)/l

[boreal adder]

hello guys anyone know about Developed approaches for using induced pluripotent stem cells for in vitro modeling?

[modest oracle]

@stray umbra

[hybrid rose]

@modest oracle wrong ping

[modest oracle]

Oh yeah sry. Thank you !

[hybrid rose]

C?

[wet trench]

List the factors on which lateral displacement depend. I need this answer asap

[modest oracle]

What subject does the term "lateral displacement" come from ?

[cedar drum]

Physics ig

[quiet reef]

yes he is talking about lateral displacement of light in glass slab ig

[quiet reef]

1)angle of incident ray . 2)Thickness of glass slab 3) refractive index

[wet trench]

Physics

[wet trench]

That's it?

[quiet reef]

yes

[rancid badge]

Translation:
What effect does ethanol cause in solutions of sulfate salts? What is the reason why this phenomenon occurs?
I could not find information :/

[wet trench]

cool thx

[sick dagger]

anyone can help me with orgo 1

just a quick question thats all

[peak steppe]

hi!! i need a little help here. is the correct answer A or C?
for A, i remembered that ions are more stable than atoms. as for C, i know that ions move more freely. unless theres a problem with this question?

[wraith moss]

Yaa. A holds true for group 1 element
And i couldnt understand C

[peak steppe]

alright! thank you so much :)

[wraith moss]

:]

[thorny gyro]

Hey,is anyone good with the topic ‘describing movement’ under the topic mechanics ?
It’s still at an introductorylevel.

[modest oracle]

Yup

[thorny gyro]

Great ! I’ll dm you

[quiet reef]

yes..actually i am revising mechanics rn

[wintry terrace]

it says that we can add things with same dimensional formula but you can;t add speed to velocity because speed is scalar and velocity is vector

[thorny gyro]

I’ll let you know if I need more help but thank you ☺️

[quiet reef]

sure buddy

[cyan prairie]

do true solutions also shows brownian movements ? If yes then is it faster n true solutions or on colloids? if no then plz give the reason!!!!

[thorny gyro]

Can someone plsz verify this for me

Iam not getting the option A as my ans

[hybrid rose]

@thorny gyro yes it's A

Field is 2K lamda /R

Not R²

[thorny gyro]

Thanks mate 😭

@hybrid rose I FOWKING DID IT

[rancid badge]

If in an exothermic reaction the temperature is increased after the chemical equilibrium has been reached, in this reaction the following will take place:

??

[native hatch]

Reaction will proceed in backward direction

[hollow star]

can somebody tell me what this is named? I have some trouble with this

[quartz zealot]

1-(3-Ethylpiperidine-3-yl)ethanol?

[hybrid rose]

Great!

[vagrant loom]

help

[quiet reef]

that's what i was thinking..i started having a crisis with my education

[quiet reef]

this is from an Indian entrance test,right?

you preparing for JEE?

[thorny gyro]

Yess

[thorny gyro]

Iam preparing for kcet and comed-k
Its not that hard as JEE

[quiet reef]

Jee main isnt that hard..Jee advance is hard🥲

[native haven]

Please help in this question!!!

[hybrid rose]

t3/4= 2t1/2 for first order reaction & radioactive disintegration is a first order reaction

@native haven

[quiet reef]

3/4

in first half life half of the material will be disintegrated so thats 1/2

now half material is left to disintegrate..and in next half life the haf of the remaining 1/2 will be disintegrated ie.1/4

so after 2 half lives 1/2+1/4=3/4 fraction of original material is disintegrated

[native haven]

OK thanks

[visual minnow]

Chemistry help please

[keen kayak]

Do you want a more in depth explanation?

[swift glade]

heyy, does someone know how to do this exercise? :c (i translated it because it was in spanish)
@hidden tundra cdenio bbx? XD

[dense venture]

Step one find double bond equivalent

[quiet reef]

A - P ; B - S ; C - Q ; D - T

these are my guesses

[quiet reef]

could be wrong

[visual minnow]

its acc correct ty haha

[quiet reef]

oki oki

[native haven]

Please help with this question!!

[rancid badge]

I could already answer, thank you very much

[cunning crescent]

is there any information about what y2 is?

[stable sand]

someone help me with this electricity question

An electric lamp of 100 Ohms, a toaster of resistance 50 Ohms, and a water filter of resistance 500 Ohms are connected in parallel to a 220 V source. What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances, and what is the current through it?

[quiet reef]

bro where is rest part of the question XD

[vagrant loom]

2nd derivative d2y/dx^2

ans a

[quiet reef]

Feel free to ask if you dont get any of the calculations

[stable sand]

can you draw a diagram

i mean is it possible to have that electric iron connected along with those parallel resistors in a same diagram

same circuit

[quiet reef]

no u dont get the question

wait

electric lamp of 100 Ohms, a toaster of resistance 50 Ohms, and a water filter of resistance 500 Ohms are connected in parallel to a 220 V source. This is one circuit

and the iron is another circuit which has the resistance = equivalent resistance of 1st cicuit

[stable sand]

can it be like this

and how do we know they are separate circuits

[stable sand]

here can R4 have resistance = R1+R2+R3

[native haven]

@quiet reef this is the full question!!

[quiet reef]

no no no R4 is not in the circuit..bulid another circuit with just R4 in it..and 1/R4=1/R1+1/R2+1/R3

r1 ,r2,r3 are in circuit 1 and R4 is in circuit 2..

[stable sand]

how do we know that

it's not given in question

can this circuit exist anyway?

[quiet reef]

its given that electric iron is connected to same source ie 220 V and it takes the same amount of current combined of r1,r2,r3

sooooo,to have same amount of current it must have same resistance as equivalent resistance of r1,r2,r3

bcz the source ie 220 V is fixed/constant

[stable sand]

yes resistance is same

[quiet reef]

it isnt given that R4 is in series with r1,r2 and r3

so we consider another circuit with same P.D.

[quiet reef]

in your question there is no mention of y2...so there must be some equation or something..just send the full page

[stable sand]

thanks, i guess i will have to remember to make another one next time for the question sake

i guess R4 won't be equal to (R1+R2+R3) if drawn in single circuit

[thorny gyro]

Question B

This is the solution in the book

Can Any one explain a little bit

Why did we consider the voltage drop on 20V and 6 ohm resistance?

[fast fable]

you can in theory treat the problem by decomposing it in many cases, and then you superpose the solutions

[thorny gyro]

Can it be solved using just Kirchoff? I need to solve it without using any network thoerems(mesh/superposition etc)

is there a branch where I can simply use the KVL and find V?

[fast fable]

you can use KVL everywhere, just the derivation will be easier for some branches

[thorny gyro]

I see. Thank you

[fast fable]

KLV is equivalently done in terms of currents, that is just the same concept

[thorny gyro]

Is the solution correct?

@fast fable

[fast fable]

the result seems correct

[thorny gyro]

Thanks

[small badge]

Can you apply zero potential method in this?

[cloud igloo]

@thorny gyro option b?

jaja I'll tell the method

and surface charge distribution

[arctic quartz]

help

[thorny gyro]

B

((3k || 2k) +4k ) || 1k || 5k

[thorny gyro]

The second part

[lime pumice]

Take each and terminal and find the effective resistance using the formula for series and parallel combination. Then replace those resistances with the calculated effective resistance and continue doing so till you reach your final terminals.

Take an element charge and calculate the dipole moment with the corresponding opposite charge. Then add the infinetesimaly small dipole moments using integration. Just try imagining the given structure as an accumulation of many dipoles.

[thorny gyro]

hi what would be the name of this compound?

[tired obsidian]

So one of my projects right now is about atmospheric modelling and I need to use a certain equation but im not sure how to interpret it.
It's eqn 4 from https://brian-rose.github.io/ClimateLaboratoryBook/courseware/one-dim-ebm.html
Could someone help me out a bit

[left sail]

The variation in respect of time of the temperature of the surface of the ocean is obviously proportional to the effective heat capacity of the atmosphere (the C(phi) term)), think of it as the mass in Newton's law: F=ma. Now, this variation is the result of the difference between the outgoing and the absorbed radiation (makes sense, if you receive less energy than you emit, you lose energy), so that's what the ASR(phi)-OLR(phi) signifies.

[tired obsidian]

what is the C(phi) term again? the heat capacity?

[left sail]

Yes! It's the energy needed for a liter of the ocean to go up 1 K

[tired obsidian]

oh so C(phi) * dT/dt is the rate of change of heat content?

[left sail]

(more or less, that's how I understand it), see the heat capacity is defined as the derivative in respect to the temperature of the heat.

[left sail]

Well, you have to understand sort of as the term ma in F=ma for instance. dTs/dt is the rate of change of surface temperature, and it is moderated by the heat capacity of the oceans

[tired obsidian]

yeah

theres also one more equation that im not sure of

[left sail]

Sure, H is the local heat flux density, and Fourier's law gives us H=-KdT/dy if you take a unidimensional approach. Now, here, the temperature considered is the surface temperature. This is why the surface 2pia^2cos(phi) appears.

[tired obsidian]

so in Fourier's Law you get the dy bit, where does that go in the 2nd equation?

[left sail]

Here y is the latitude phi

[tired obsidian]

oh i see

I'm guessing the K term becomes 2 * pi * a^2 * cos(phi) * D

[left sail]

Well the authors wanted to use the thermal conductivity which normally appears in Fourier's law as H=-DdT/dphi, yet there, we want to make Ts = T/(2pia^2cos(phi) ) appear so we just write the law from the screenshot which is an approximation as we neglect the variations of cos(phi) in respect to phi (H=-Dd(Ts2pia^2cos(phi))/dphi=-2pia^2*cos(phi)DdTs/dphi

[tired obsidian]

why is Ts = T/(2pia^2cos(phi)) what we want? what is T in this case

[left sail]

Yes, sorry I'm mistaken, H is simply the heat flux, and in Fourier's law, we have H/S= -DdT/dy, which gives the expression above

[tired obsidian]

whats S

[left sail]

the surface considered, at phi latitude

[tired obsidian]

oh ok

i think i get it now

thanks for the help!

[left sail]

sorry for being confusing 🙂

[tired obsidian]

out of curiousity

do you study this topic

you seem quite knowledgeable

[left sail]

I have touched on this topic recently in a 6 hours long exam paper (the hardest paper of this year's concours) and have studied it a little bit as a result out of curiosity in May. I have no other experience on it though

[tired obsidian]

oh nice. i was surprised at how fast i got a response to my question. It's quite a niche topic

Well good luck in your exams!

[left sail]

Glad I could help, this topic is quite interesting!

About my exam, I'll be taking it in April 2022 so I have a fair bit of time!

[lime pumice]

Some one please help me out with this one

[woeful talon]

why do RBCs dont have Endoplasmic Reticulum?

[lime pumice]

ER would make the RBC's rigid and they won't be able to bend to fit in the capillaries.

[sick raven]

What color spectrum heats more a glass of water: Red or Violet? and why?

[left sail]

Purple (that is close to ultraviolet) corresponds to higher frequencies than red (close to infrared) thus, knowing that E=hv where v is the frequency of the wave, violet heats more as it transmits more energy

[sick raven]

So why the infrared is most used to heat things?

[left sail]

Infrared light is not used to heat things but rather infrared lights are detected to see hot objects as according certain laws (Wien's displacement law for instance) , objects that have a temperature of about 10^3K emit most of their radiations in the infrared spectrum

[sick raven]

Ok thanks

[pale girder]

i have a doubt in a derivation

anyone?

please

in derivation of 3rd eq of motion my teacher did a step in integration that i did not understand if anyone does please explain i will send ss

when he integrates vdv it becomes vsquare by 2 why?

please tell

[pale girder]

ahhh okay

so u use the rule
x n+1/n+1

shit

so ez

[pale girder]

sheeeesh

[pale girder]

ok so

a jet airplane travelling at a speed of 500 km/h ejects its product of combustion 1500 km/h relative to the jet, what is the speed of the combustion wiht respect to observer on ground

i did it but my value is coming 1000km/h for speed of combustion but not relative velocity between combustion and observer

[pale girder]

oh so as observer is stationary therefore velocity of combustion is equal to what observer sees?

ok

thanks bro

[sacred peak]

Can someone explain the circled calculation

[modest oracle]

Line 2 : everything in the fraction cancels out except 0,5² / 1,5² = (0,5/1,5)² = (1/3)² = 1/9 = 0,1111111...1...

Line 3 : 6 * 0,11111...1... = 6,666...6... ~= 6,67

Line 4 : 1*10^-2 m = 1 cm

[sacred peak]

Ohhh ok thank u so much!

[bold kelp]

CO2 + H2O = H2CO3 when is it when pressure is high or low
and what does h2co3 give when high pressure

low pressure carbonic acid??

what does h2co3 give when high temperature

ohhh

nvm

[pale girder]

my teacher defined angle of resultant vector b/w two vectors which were equal in magnitude (angle was 120) so i got all the steps but one step troubles me

why did he do 1-1/2?

[idle idol]

What’s vectors form the 120 angles?

[pale girder]

a and b

[exotic wagon]

does anyone know class 12 cbse physics

[pale girder]

im in 11th 😦

[idle idol]

Do you have a pic ?

[foggy frost]

Physics 20 (grade 11) how to manipulate formula of d=1/2a(t squared)?

Module i have does not show me how to do it, they just give final formula

[midnight crest]

Does anyone know any chemistry books that I could read? like not exactly a text book but like something with minimum pictures. Something for year 11

Thanks

[pale girder]

@thorny gyro why did u do 1-1/2

[pale girder]

its ok

yeah yeah i got that much cos 120 is -1/2

but why does it get subtracted from 1

@thorny gyro

[pale girder]

oh ok

[thorny gyro]

yep

[covert sierra]

Hello

[ornate panther]

Does any body have any life-changing tips for Physics?

[modest oracle]

F = ma

Tbh, this question is very wide. What're you talking about: mecanics, electricity, waves ?

[wet trench]

do u like math? if no then try and develop an interest cuz math is literally the foundation of phy

[keen vector]

Try to visualise everything and imagine the given situation. Visual connection when integrates with curiosity is a bomb. Inspite of being a biology student I crave for physics because it generates a lot of questions and possibilities when you imagine the situation and try to find it's solution.❤️

[visual minnow]

anyone know the structure of this

[abstract scarab]

hey can i get help with

diphosphorus pentabromide

in a chemical formula?

[vagrant parrot]

Can someone help me out with a certain chemistry questions on VC

[rugged apex]

help!

[ornate panther]

I do well in math but I don't necessarily like it lol

[ornate panther]

Very helpful, thanks!!

[thorny gyro]

option A because it is a mixture of strong acid and a weak base

[rugged apex]

thankyou any luck with the rest of them

[thorny gyro]

Q26' s answer should be A and D i suppose

[thorny gyro]

Do you have to choose only one option? because both a) and d) should be correct here

[rugged apex]

yeah its mltiple choice

thankyou

[wet trench]

Yea thats wt im saying, try develop the so called liking towards the subject
It'll help by not stressing u out

[cunning crescent]

I see this is really much later and I haven't looked fully into it, but I believe D ) is the right one, A) can act as a buffer bc there is half as much strong acid as weak, therefore a buffer can be formed from the reactants. Whereas in D there is 1 mole of strong acid, so no buffer can be made

[cerulean juniper]

hey everyone, i’m having a lot of difficulty with this question

[thorny gyro]

there a several ways to solve this, one of them is using equation of trajectory.

[thorny gyro]

exact trajectory of projectile.
hope it helps

[tacit notch]

Hii

[sick dust]

I need solution for this. Thank you

[exotic wagon]

anyone cbse 12th or can help with 12th chem

[cerulean juniper]

you're amazing, God bless you

[marble nova]

pls help me too

[cunning crescent]

If you have any specific questions you need help with I can probably help ya, just post them here and ping me, I'll get back to them later or someone else will help you find a solution :)

[exotic wagon]

suree thanks a lot eva!!

[sick dust]

Anyone please..?

[exotic wagon]

hey difference between aldehydes and ketones

[thorny gyro]

for such questions always try to first find the dependent relation relation between distances which on differentiating gives dependent velocities.
hope it helps 😃

[sick dust]

Thanks a lot, you saved my day!!!

[jade wraith]

hey guys, does anyone know any resources like books where i can practice questions of fracture mechanics- having topics like weibull distribution, size of plastic zone, fracture toughness, energy release rate

[cunning crescent]

An aldehyde is a ketone with an H as one of the R groups, basically.

[thorny gyro]

help i tried doing this using kcl but the answers not coming

ok nvm guys i got it thank u

[slow raptor]

Hi guys, I need help with this question if anyone know how to do it 🥲
the strategies i've come up with are:

1. Reduce the thickness (z) of the wall
2. Reduce the size of the molecules as smaller molecules diffuse faster
3. Increasing the pressure in position 1 by increasing the concentration of molecules
4. Increase the surface area of position 1

i know its about the derivation of Fick's First Law of Diffusion but the problem is, i dont know how to derive the equation. So, i would really appreciate it if someone can teach me how to do this question ..

[digital mango]

Hi, I need some help, I traduced the best I could, but I'm not sure it's right, here it goes; Sensitive information travels in the form of action potentials of equal amplitude but variable frequency and they are only discriminated in the brain. The brain does not determine the type of stimulus because they all arrive as action potentials, but through where the potential arrived. Any activity arriving from the photoreceptors will be decoded in the center of vision as light; if, for some reason, it reached the center of the ear, it would be interpreted as sound.

[digital mango]

Oh, don't worry, I already understood :).

[spare lotus]

Include potential and study capacitance later

[wraith moss]

Completing the whole electrostatics portion in 1 go will be better no? 👀

[fast fable]

The beginning of the exercice, that seems to be about a miximization of the flux, so your propositions seem okay (I made an analogy with plasma physics as I have never studied so much diffusion theory); now , for a constant flux, you can derive the law by considering what you wrote: the flux is a linear vectorial quantity of all the quantities implied, so try to write a multiplicative expression of the flux by considering : "if I increase it, that gives a ... flux" (tips: if something makes the flux decrease by increasing, it is situated in denominator); then fins what is constant and what is not; tips: spacial quantities are barely always differential and as you have a volume, you can derive a differential surface and for deriving the surfacic flux. Then put a random positive coefficient (corresponding to a caracteristic coeff of the system) and an adapted sign corresponding of what you observe in experimentations (is the tea concentrating or diffusing in your mug over time that directly depends on the sign..); then after obtaining the flux as a expression of the concentration (easy task by playing with coeff, but you need to consider infinitively small z), you can write equal to the temporal derivative of the concentration. I hope that will help you..

[slow raptor]

omgg thank you so much!! now I understand a bit , but i'll go through again to make sure i really understand 100% hehe thankyouuu!!

[fast fable]

your welcome! sorry for the tipos, I did not double-checked .. If you need help I can try to help you

[broken halo]

I have a physics lab and I have to try to predict where 2 balls will meet when the ramps are 1 meter apart, and the consensus speed for ball one is .224 m/s and ball 2 is .278 m/s. I know it is simple but I am missing a key step. Can anyone help? Thanks in advance.

[pale girder]

what is the formula for molarity for finding molarity and mass of a third subs

[fast fable]

you know that the speeds are different but each ball need a time t to reach the point x to meet the other ball; and : distance/speed = time

the first ball needs to cross x; and if the total length is D, the other ball crossesthe distance D-x

[broken halo]

Ok thank you!

[fast fable]

does it make sense?

[broken halo]

I think so. Is there a formula besides the speed = d/t? Sorry if this is the question reiterated.

[fast fable]

perhaps, Idk sorry

[broken halo]

No problem!

I got until August 6th to forgive it out.

[wraith moss]

I dont think there is a specific formula fir what you are saying
But there is the molarity equation
M1×V1 =M2×V2(dilution from volume V1 to V2)
This equation might be helpful

[pale girder]

isnt there one like m3 = m1v1+m2v2/v1+v2

and for v3 = v1+v2

[wraith moss]

Yaa. The final molarity is given by that formula but valid only for non reacting solutions

[wraith moss]

Ig because they r not reacting

[wraith moss]

Is there a specific question?

[pale girder]

my ques was to find out molarity of na2so4 in a reaction of h2s04 of 1l solution and 0.1 molarity, and naoh of same qt.

[pale girder]

so i took out molarity of na2so4 by this formula

whcih was wrong

[pale girder]

@wraith moss try solving this

[wraith moss]

Ok imma try

[pale girder]

ty

[wraith moss]

I didnt used this formula cause i realised later that they react to form water
Nd the formula is only when the substance dont react

The reaction will be
H2so4 + naoh-> na2so4 +h2o

[pale girder]

yeah

but they only asking for h2so4

how do we do this ques

[wraith moss]

Balancing it we get.
H2so4 + 2naoh -> na2so4 +2h2o
We hav 0.1 moles of h2so4 and naoh
So naoh will limit the reaction

[wraith moss]

H2so4 is given

[pale girder]

oh mb

na2so4

[wraith moss]

Only 0.05 moles of Naoh will get involve in the reaction

0.05 moles of Na2so4 will be formed
As 0.1 mole of h2so4 will react with 0.05 mole naoh

Answer is 0.05?

[abstract scarab]

can i pls get some science help

I

[cunning crescent]

Al(NO3)3

[peak steppe]

hi! quick question, will water remain as molecules when reacted with hydrochloric acid?

[rancid badge]

Translation: Determine the functions to be able to construct the shear force and bending moment diagram for the structure

[rotund bobcat]

hey anyone prepaing for neet 2022?

[shy bone]

Yes

[thorny gyro]

yep

[dawn elk]

Ayo guys can anyone give me some tips on how to study physics T.T

[rotund bobcat]

have fun learning it

[pine cave]

Yupp

[wooden basalt]

can someone introduce me to physics? due to personal reasons i had to take six months off school and am now doing summer school but the teacher isnt providing us with enough to learn from- so any links to videos or reccomendations would be so much help

[small badge]

Can someone please help in balancing this?

[cunning crescent]

Do you just want the balanced reaction or like a step by step guide to balancing it?

[small badge]

The balanced one alone would do. Thank you :)

[rotund bobcat]

6NaOH + 3Cl2 --> 5Nacl +NaClO3 + 3H2O

[civic kraken]

Yo

[small badge]

Oh that's what i missed! Thanks a lot @rotund bobcat!

silly mistake though😅

[small badge]

yoo

[rotund bobcat]

your welcome. haha happens

[civic kraken]

U are from

[cunning crescent]

OH I fkn missed that the starting equation had the wrong relation, I was really struggling lmfao

[small badge]

i balanced the rest and that damn oxygen was killing me(well it doesnt make sense haha). But uh yep turns out i had sodium wrong.

[cunning crescent]

I was wondering how the hell I was supposed to balance an equation with one extra Na and one extra Cl, never struck me to remove the NaCl 😂

[small badge]

same! 😆

welll thank you both for your help!

[faint nymph]

2021

[rotund bobcat]

good luck

[burnt blaze]

jee but close enough xd

[lone juniper]

Can someone tell me how to read this..? Like they said I is 2 when the Terminal Potential diff is zero but according to the graph isn’t that 8V or am I doing sth wrong?

[thorny gyro]

what does hydration energy mean in the context that Li is The Best reductant because of its small size and high hydration energy
all the sources i look up online detail hydration energy as the energy taken in or given off when a ionic salt disassociates in water

[cunning crescent]

Probably that Li oxidises easily

[thorny gyro]

yeah i get that but what is attempted to be said about Li referencing Hydration energy
that is what i dont understand

[broken halo]

If something with an initial velocity of zero gained speed until a final velocity of 26 m/s how far would it travel? The time is 8 seconds

I can’t figure this out and I know it is supposed to be easy

[keen jetty]

x = (1/2) a t2 + vit.
vi=0
a= (26/8)
x= (1/2)(26/8)(8^2)+0*8
x=104m

assuming the speed gained was linear

[broken halo]

Oh. Thank you!

[stray umbra]

The Miller indices of two parallel lattice planes which intercept all the three crystallographic axes are 111 and 222 .The intercept of 222 will be ?
a) = of the (111) plane b)double or 111 plane c) half of 111 plane d)none of these
Any idea??

[cunning crescent]

If Li has a high hydration energy it means it will dissociate quickly in water, therefore going quickly from Li to Li+. So I think they just mean it oxidises quickly, unless there is more context to this, f.x. the reaction taking place in water

[celest terrace]

Am feeling very difficulty in doing Physics numericals 😶😶

[dry juniper]

can anyone help me in chemistry?

[thorny gyro]

Thanks dude I finally get it

[sick dust]

Please help me with this problem

[thorny gyro]

I may be oversimplifying this, but I'll give this a shot. If you are looking for the minimum time that one of the ships will hear the gun shot from the other ship, then would you not just use the quickest possible value for the speed of sound (in this case, water would be the medium)? If this were the case, knowing that the two ships are 3km apart, and average speed is equal to distance over time, we can rearrange the formula for speed to solve for time such that time is equal to distance over speed. Likewise, if we know that the speed of sound in water (which is the fastest in the given example) then we can substitute 1500 m/s for the speed, and 3000 m for the distance. Divide the distance by the speed, and you get 2 seconds.

At least, that is my take on the question. This question is worded very strangely, and can be interpreted in numerous ways. So I apologize if that is not the answer you were looking for, I'm not sure what topics you are covering in your class.

[keen jetty]

There is also the speed in the rock, but in the end it will be the same time in both

[keen kayak]

The last part is it like a fact that two point masses coming together (attractive force) will ne considered as -ve? And repulsive forces will be considered as +ve?

[fast fable]

As mass is assumed as always positive, and gravity is a distant attractive force, you need to put a -

[sick dust]

I also gave the answer as two but the key answer showed it as wrong. It didn't give me the exact answer. It just said your answer is wrong

[sick dust]

Exactly

[thorny gyro]

I really don't understand what they're asking then, I apologize.

Maybe they want you to average the speed of sound in all mediums?

But the fact they gave you the height of the water makes me think that's not what they mean.

[pearl jacinth]

I would try to watch some crash course videos and Khan Academy can also help with learning Physics

[thorny gyro]

I got it

So

The sound will first travel from the bottom of one boat to the bottom of the ocean at 1500 m/s

then the sound will travel through the rock at 4500 m/s for 3000 m

then the sound will go back up to the other boat through the water at 1500 m/s

I haven't done the calculation yet, but it's either that

or simply 333 m/s for 3000 m

But I think it's the one I just said

[versed bane]

i’m having the same problem :/

[civic kraken]

Is there any mimicary artist I need help

[celest terrace]

Anyone know Latimer diagram??

[fair mason]

Can someone help me out w some jee level questions rn?

[main plank]

anyone can tryand explain

[compact scroll]

Because VR is a ratio of distance and decrease in effort doesn't affect VR. Only the distance travelled by the effort arm and load arm matters in its case. And for MA, force is the deciding factor like distance for VR.

[fierce sun]

t represents time, substitute in the four seconds given to you to get 2

[tame karma]

Would you call a Frisbee a 'disc' or a 'disk'?

[fierce sun]

id say disc but up to you

[stone aspen]

Esxape velocity

[tame karma]

Thanks, I would say disc too.

[digital thicket]

Will it be zero since a dc source is used?

[modest oracle]

It depends on the hypothesis, but I would say it's incorrect. During its fall, a rain drop undergoes its own weight : a gravitational force that attracts it towards the ground. Even with air friction, it isn't in equilibrium (net force ≠ 0)

[thorny gyro]

if its in dynamic equilibrium, then air friction = weight. Newtons first law states that these need to be equal for constant motion (equilibrium)

[modest oracle]

Oh I may have misunderstood the question

[thorny gyro]

I think theyre confused on the forces involved in dynamic equilibrium (aka terminal velocity)

[woeful talon]

If you could answer this. Thanks! Appreciate it.

[thorny gyro]

When the raindrop leaves the cloud, it only has 1 force - its on weight. This causes it to accelerate towards the ground. But as it gets quicker and quicker, air friction starts push back on the rain drop. The force of air friction will increase, until it is the same as the force of the weight, and they are now equal. This means the raindrop will stop accelerating and stay at a constant speed. This is newtons 1st law, because the up and down forces are equal, and so net force = 0, so there are now no changes to its speed.

[white wasp]

i dont understand the solution of this and other tasks. i want to take a step back. what should i learn first?

[stray umbra]

Does M₀.₉₈O (M-metal) does this means the compound is impure? What does that decimal subscript for?

[vapid relic]

hi! i just started teaching myself physics, sorry if this is a stupid question. i had to draw a feynman diagram for this interaction: An electron and a positron annihilate to produce two gamma ray photons, one of which then pair produces an electron and a positron pair.
the diagram was easy, but i was wondering, isn't this a violation of the law of conservation of energy? how does one gamma ray produced via annihilation of an electron-positron pair then go on to produce a second electron-positron pair itself? surely the incident photon doesn't have sufficient energy for this?

[void elbow]

Hi would anybody be able to help me? :)
If a-amalayse is transcribed and translation occurs on the rough endoplasmic reticulim in cells of the salivary gland, how is the molecule prepared and secreted by cells of the salivary gland after translation has taken place?
Thank youu

[celest terrace]

U need question bank?

[vapid relic]

that'll be describing the steps before, during and after entering the golgi apparatus!

[void elbow]

@vapid relic do I need to talk about exocytosis?

[vapid relic]

definitely :)

[void elbow]

@vapid relic ok thank you 🙂

[small badge]

Hello everyone. i have a doubt regarding acids and bases. When an acid is dissolved in water, basically the H+ ions are disassociated from the acid right? and the H+ ions are combined with water so H3O+? If possible a diagram showing this would be great. thanks

[quartz zealot]

When an acid is dissolved in water, basically the H+ ions are disassociated from the acid right? and the H+ ions are combined with water so H3O+? I
Correct. There isn't really any big trick to it, the Lewis structure would be like this: https://hi-static.z-dn.net/files/dbc/28ebe6a3e2c84cda844cefaed15b7d5b.jpg

[last tulip]

can someone help me please

[modest oracle]

Translation ?

[wind atlas]

el angulo lo podes sacar por trigonometria,creo

[small badge]

Oh I see… thank you!

[quartz zealot]

Note, I'm not well versed in physics, but I think first question should be trivial by using formula
R = (mv) / (qB)
(Note that you might need to use the relativistic equation instead)
Second question is trigonometry (you should sketch it out), but I think it should work out to
x = 2 * R * cos(60°)
Then, I believe you can use trigonometry to find the answer to the third question

[dull yoke]

heyy, im doing my assignment, do anyone here familiar with industrial hygiene? especially with Occupational Exposure Limits (OELs). if anyone does, please help me🥲

[small badge]

Hello all. I have a question regarding magnetic effects of current. the question is based on the observation that as the current is increased, the magnitude of the magnetic field is also increased. Is the magnitude of a magnetic field directly proportional to the magnitude of current? Is there an expression to show this? thanks in advance

[modest oracle]

It is. For an infinitely long, straight, thin, wire, you get, via Ampere's law applied to a circle of radius r perpendicular to the wire (with a current I), you get :

[modest oracle]

(H, dl, I and B are vectors, but I can't remember the command to add small arrows above symbols)

(The reason H can exit the integral is that, as the trajectory if dl along the circle stays at the same distance r from the wire, H is constant everywhere in the trajectory)

But everything I wrote is only valid for an infinitely long , thin, straight wire. In other cases, the formula of B changes, still stays proportional to I.

[storm anchor]

Someone can help me with this question please

[small badge]

Thanks a lot for that!! Its advanced compared to what im learning atm(really advanced infact). But im able to get what you're saying. thanks again

[modest oracle]

Oh, sorry. If there's anything you'd like explained to you, feel free to ask in dm or here

[storm anchor]

ty

lul the formula disappeared

[modest oracle]

Yeah

'cause I'm not sure anymore about it. I'm in a car and doing the calculation in my head, so I'm not 100% focused

But basically, the acceleration in a uniform, circular movement is v²/r

Thus Fb = mv²/r

(Fb = magnetic force)

(Fb and v are vectors)

[storm anchor]

and fb also equals to qv x B

[modest oracle]

Yup

As v and B are perpendicular to each other, you can get rid of the dot product and keep the magnitudes of v and B

[thorny gyro]

helpppp

[pseudo fern]

Anyone who have used DWSIM?

[hybrid rose]

Write equation of current & put i = I/4 , where I would be initial current

[dark charm]

Hi, I have a quick question. In physics, if you see the symbol W with a subscript, for example, Wman, does that mean work done by man or work done on the man?

[vagrant parrot]

I really need someone to help me in chemistry

[thorny gyro]

i tried but the answer isnt coming

[thorny gyro]

its a wheatstone bridge

[open lichen]

Exactly as @thorny gyro said, wheatstone bridge were Vd of R5 becomes 0, and you only need to do a parallel

[sand spade]

Is the ans option 3?

[shell drum]

Did you figure it out ?

[shell drum]

I'm just gonna leave the solution here since nobody else did

[shell drum]

@sullen slate

[sullen slate]

thank you sooo much, i got it

[shell drum]

[daring canyon]

Okay, so I will surely ask a very stupid question here:

I'm definitely wrong, but; why isn't time a vector?

I know it isn't, because division of vectors is surely impossible. But, if we were to assume that time IS a vector (it has magnitude and direction), then we shouldn't be able to rationalise the increment of a vector by its time to obtain rate of change...

Thanks in advance. It is not necessarily a math topic (I do this in the name of physics...).

[modest oracle]

The reason, I think, time can't be a vector, is that the world only has one "timeline"

[daring canyon]

As in, a forced direction, on which we relate everything else?

Because, well....if time follows that ' line' , then time would be a vector, no? 😛

[modest oracle]

No, because the line is the t-axis, and only numbers (not vectors) hold in single axis (which are 1-dimensional)

Vectors hold in plan, space, ... but not axis

[thorny gyro]

hey, I have just done some quick research, but I think that the idea that makes the most sense, is that time is a vector component.
In Newtonian pyhsics, time is an invariant quantity, and a scalar is something which is invariant under coorrdiante transformations. If the magnitude of a time vector is its only component, then time would have to be scalar. However, in relativity, space and time can be combined into a single thing (spacetime), a four-vector, which has three spacial dimensions and one time dimension. As time is a component of a four-vector, it cannot be an invariant quality, so cannot be scalar, but is also not a vector, so is considered a vector component. It is also sometimes described as a bivector, so i guess you could say it is a vector, but not in a typical way? but yh, i hope this makes sense, pls correct me on anything because i am really not an expert.

[modest oracle]

(Of course, numbers can be seen as one-dimensional vectors or 1x1 matrix, but that doesn't change anything, as they only contain one number)

[daring canyon]

Why couldn't it be a vector with component e_t*a_t with e_t the unit vector for time, and a_t any scalar, which is a function of something bigger?

[modest oracle]

Because, if time effectively was a vector, then there could be multiple information about time for a same instantaneous situation

Instead of "4s seconds have elapsed since ...", we would have to say "4 seconds and 7 parallel seconds have elapsed since ..."
Thus, that would mark a difference between the time-vectors [4,7] and [4,0], meaning that, at 4 seconds, there are many parallel universe with different values for parallel seconds (7 and 0 in my example). But including parallel universe isn't nothing at all in physics.

More practical example. Let's pretend that time is a 2-component vector.

How would you sort chronologically several events that happened in your life using a 2D plan, not a unique axis ? For this latter, you could merely use years as unit, and define birth as the origin of the axis. But for a plan ?

[fading mango]

Are magnetic field lines and magnetic lines of force the same thing? Cuz in Resnick & Halliday it says the tangent of a field line gives the direction of Magnetic Field (B) but in my school textbook it says the tangent gives the direction of Force (F).... and they can't both be right cuz magnetic field and force are perpendicular, right?

We know that a compass aligns itself along these lines... so do we say it's responding to the force or is it aligning itself with the magnetic field?

[modest oracle]

Field lines are tangent to magnetic field (B), because they are a discrete representation of it

[fading mango]

so the tangent to a field line is B, not F?

my school textbook is wrong?

(It's quite possible, it's a very bad textbook)

[modest oracle]

Checking on the 8internet

The internet is your friend

https://tenor.com/view/boburnham-inside-netflix-internet-computer-gif-21887509

[thorny gyro]

Hi, can y'all help me out with this?

[hybrid rose]

217.5

[thorny gyro]

It's either 48.3g or 43.5g.

[hybrid rose]

Ah wait lemme check cal

[hybrid rose]

My bad , I divided by 2 instead of 9 , it would be 48.333

[thorny gyro]

Can you please send the solution?

[hybrid rose]

Moles of cl2 = 1/2

Moles of mno2 required = 1/2

Mass of mno2 required = 87/2

87/2 is 90% of mass of solution

So mass of solution is 87/1.8

@thorny gyro

[thorny gyro]

Okay but then if we're reacting 0.5 moles of Cl2 we then it's MnO2 reacting with it will have to be pure right? As impurities won't take part in the reaction. So 1/2 mole of MnO2 is the pure 90% right?

[hybrid rose]

Yes

Impurities don't take part in reactions until it's mentioned so

[thorny gyro]

Yeah so as it's not mentioned here we should be considering the final mass as 48.3 g right?

@hybrid rose

[hybrid rose]

Yep required mass of solution would be 48.3

[thorny gyro]

Okay thank you!

[hybrid rose]

Np

[torpid totem]

what a coincidence
i was studying this topic

too

[modest oracle]

Haha

Timing

[hybrid rose]

B

[rugged apex]

thank you

[small badge]

https://youtu.be/1eaYQqizfTc Any thoughts on this? i would love to discuss this topic( though i dont know too much but very interested)

[hybrid rose]

46 - 7
47- 2
48- 5 ?
49- 4
50- 6

[vagrant parrot]

Also if anyone knows where I can find questions or moles be it a document or site I'd really appreciate it

[vagrant parrot]

I got 0.01dm^3 on question 1

And 0.02dm^3 (20cm^3) on question 2

Are those correct?

[hybrid rose]

No.

[vagrant parrot]

What's the answer?

[wraith moss]

2nd one is right .
And i think 1st should be 0.01 Lt ,not dm^3

[vagrant parrot]

Oh it doesn't mention that unit in my book
It's HS stuff so it's prolly not really indepth

Phew but if the numbers are right then I did it correctly thank god

[visual minnow]

please help me out

im litrally stuck at this part of my assignment for so long

or someone plesase help me understand arotmatic compounds

thanks

[sly ridge]

i want to self study physics. any recommandations for textbooks, youtube channels, online courses?

[hybrid rose]

A compound is aromatic when :-

It is cyclic & planar
It has cyclic conjugation
It has 4n+2 electrons in conjugation

[hybrid rose]

dm³ = litre

[hybrid rose]

My bad , I took molarity of NaOH to be 0.1

[vagrant parrot]

Oh? So it's correct?

[thorny gyro]

pls help me out

[hybrid rose]

Yes

[thorny gyro]

any1 trying this out?

[vagrant parrot]

AWESOME!!

[modest oracle]

Hold on, I might miss something obvious because I'm tired, but the dot product v × B is directed perpendicularly to both v and B, which means towards us/the back of the page. Thus, the force (and acceleration because if Newton's first law) undergone by the electron is also directed that way (because F = q v×B). That means that the acceleration of the electron will never make it move vertically (towards point Y), but rather towards/away from us. Then, the only angle that allows an XY trajectory is the straight line caused by angle alpha = 0, because a = 0 in that case

Due to the amount of data in the question, I'm seriously doubting my answer, but that seems like it to me

[past dock]

Is there any formula for calculating the number of spectral lines in a particular series(lyman, balmer)?

[past dock]

How is the c part right?

[ivory spade]

I am getting 1.76 part but i dont get why is there a 10^-9 s in the answer

[ivory spade]

radius of circular path would be

R = m v/qBsin alpha

for it to pass through Y we can say
2R = 10 cm = 0.1 m

2R = 2 mv / qBsinalpha = 0.1

velocity = sqrt (2 q V/ m)

[ivory spade]

as velocity is inversely propotional to principal quantum number

[lone juniper]

Does anyone know why is the latter relation between the magnetic field outside and r non linear while inside it was linear?

[hybrid rose]

B inside only depends on distance from central axis (r) , while on outside it depends on 1/r

@lone juniper

[lone juniper]

So like all inversely proportional relations HAVE TO BE NON LINEAR...or is it just this case?

[hybrid rose]

inversely proportional is hyperbola

xy= c form

linear relations are straight lines

Inside field has form of y= mx , whereas outside is of form xy=c

[visual minnow]

mate could you please help me for that i am so confused

i still cant do it

[lone juniper]

Ahh i need time to digest what was said there ah i still can't lemme try a bit more

[potent shard]

yo guys, not a deep into content question, but if im self studying physics using books, should i just browse the book or should i take notes? if taking notes is effective, what are the best methods?

[scenic spear]

if we have any physics university students here (astronomy focus would help) who want to get involved in a project i'm building using the python LightKurve library to search for exoplanets, it would be helpful to have someone help work through which areas of the process can be automated and which require a manual decision making period.

The project spec can be shortened down to an automated webApp which analyses Nasa data from the Kepler mission to search for exoplanets and then takes these findings and renders them onto web pages along with some stylish graphics. Very early stages of the process and fully open source but hoping it'll be interesting

[celest gorge]

i think taking notes would be better, as they are very helpful for revising the concept. more effective way of taking notes would be rather than copying directly from the book, first read the concept from the book (and other sources), then later summarise it on your own in the notebook. then revise the concept few days later, first by recalling through the mind without looking at notes, then go through the notes in the end. repeat the same process for later revision.
this method uses 'active recall' and 'spaced repetition'.

[potent shard]

thank you!

[hybrid rose]

Let's say x is linearly dependent on y , it means x =k y¹, it's graph is straight line

[hybrid rose]

Ok , lemme answer some , that might help

[hybrid rose]

1- non -aromatic ( non planar)
2- aromatic ( 4n+2 conjugation electrons)
3- aromatic ( if that is +ve charge ) or anti-aromatic (if it's negative)

[thorny gyro]

can someone explain the last two steps pls

[ivory spade]

this is what i did but there's a 2 factor missing i dont know in step 3 they expanded sin but they kept it sin alpha / 2 instead of sin alpha / 4

[past dock]

Shouldn’t that mean that it depends on it?

[hybrid rose]

product will be independent@past dock

[ivory spade]

then according to the question we multiplied with n so its independent now

[thorny gyro]

yes i got itttt thank u smmm

[daring canyon]

Quick question: Generally speaking, I know that |∆ a| ≠ ∆ |a|, however, I seem to have found one instance where they could have the same answer, even though their meaning is different... Am I wrong? 😮

I'm probably lying somewhere...right? Small mistake: | a - ∆ a| after the 'However;' comment.

*edit I think I solved it: Even though the magnitude is the same; their direction is completely different (so, even if their lengths were the same, they don't have the same meaning, still).

**edit no, I think they still have the same meaning...I am confusion.

[daring canyon]

That depends! What level physics are you now currently? If uni, then I strongly urge you to check out the book by I.V. Savelyev, which I have a PDF I can send over if you want to, however, the exam questions do not exist in English, for that book (it is a translation from Russian).

[sly ridge]

i’m looking for a textbook that starts from the basics and emphasizes on explaining the concepts since i never got that from my teacher (she mainly focused on formulas :| ). i don’t know exactly at what level i am, i’m at the end of high school and i’m looking to relearn mechanics, electromagnetism and termodynamics. if the book you recommended is not too complex then you could send it to me.

[daring canyon]

I can send it to you, of course. The book is one of the best I know! It starts from the basics; and derives pretty much everything you need to know. 🙂 Don't get scared if there's something you don't understand; just don't skip anything, and you'll understand everything, I think!

[modest oracle]

And, whenever you struggle with some concept, the internet is your friend

(I'm not kidding, I think I've used YouTube more than my textbooks to answer my questions until now :p)

[past dock]

Oh right thanks

[sonic flint]

found this helpful for stat students
https://youtu.be/wsvfasNpU2s

[wet trench]

This question is specifically for Indian Students
is it compulsory for me to take chemistry in 11th and 12th to qualify for the jee mains? can i take Phy, Math, Eco instead?

[hybrid rose]

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.careers360.com/question-chemistry-is-not-mandatory-for-jee-mains-2021-instead-of-that-we-can-choose-another-subject-if-suppose-instead-of-chemistry-cs-is-choosed-what-about-those-students-who-are-preparing-for-jee-advanced-and-chemistry-is-important/amp&ved=2ahUKEwiu58ifk4XyAhWV7HMBHQLwB9IQFjABegQIBBAG&usg=AOvVaw3BHexkt-YTqjtsiK-Bhm8W&ampcf=1

Found it on google

[wet trench]

but a lot of websites r saying its only for 2021 batch

im currently in 10th ri8 now [half of the session is over]

and i rly dont like chem but im rly into tech and all
and also i rly like economics

so engineering is my best choice, but im confused ri8 now bout my stream

[stable sand]

what is encephalogy, is it a valid term?

[brisk shell]

hi @wet trench as for me I think you are eligible to qualify jee mains cuz the main subjects are chemistry and maths so it doesn't matter if u even take economics and all the best for preparation

[vagrant parrot]

Can someone explain for me how to solve question 2

I calculated 79.8% as the percentage yield of the first question, is that right?

[stable sand]

Does anyone know about placenta?

and endometrium

[solid barn]

does anyone know any good books about string theory?

[celest gorge]

you may find good answers on physics stack exchange.

[flat ore]

do any of you all know how to use pymol?

[thorny gyro]

HELP PLS!

MORE than 1 options correct

[past dock]

U need chemistry

[wraith moss]

The first two are the conditions
But the other two are correct in a sense that binary solutions must be of a non polar solute and non polar solvent .or a polar solvent with a polar solute. (Some exceptions are there tho like N2 with water )

[thorny gyro]

Here distance and displacement will be same if particle is travelling in straight line. So use "s= ut+ 1/2 at^2"

[haughty gale]

thenks ❤️

[pale girder]

hel

explain the sentence

[pale girder]

nvm got it

ty

[brazen mirage]

Hi! I need some help from chemistry student... Where should I start my journey with chemistry? Like what basics should I learn? Any tips?

[haughty gale]

depends on the grade mate

[brazen mirage]

what do you mean by "grade mate"?

[thorny gyro]

First go through fundamentals of chemistry they are the basics ones

Then periodic classification of elements

[thorny gyro]

Which grade/class r u?

Ayo can anyone pls answer all these questions pls like I only need options and if u want to give explanation feel free to explain

AND PLEASE PLEASE IGNORE MY UGLY TOE

[brazen mirage]

11 th grade according to american schools

[thorny gyro]

Omg

I'm 8th grader

[brazen mirage]

0.0

hahah

[thorny gyro]

I'm smol

[thorny gyro]

But these are the basics I learnt when I started studying chemistry

[brazen mirage]

no problem, thanks for helping me anyways : DD

[thorny gyro]

:)

[odd flume]

hey

could anyone help with this question

[compact elbow]

https://twitter.com/thePiggsBoson/status/1420357139642535936

sunny (@thePiggsBoson)

Wanna Learn String theory and M-theory for free?

A Thread 👇

Retweets

1155

Likes

5460

Twitter · Jul 28, 2021, 12:15 PM

[fast fable]

the Heisenberg Principle holds only when we reach the classical/quantum limit; we does not observe it at our scale because from our point of view, the caracteristics quantities of space, time mass and energy are far far from the limit (h^2\2). Particularly, it impacts directly the undulatory aspect of microscopic objets, thing that we do not observe at our scale.

[pale girder]

ok ok

thankss

[digital thicket]

Can anyone solve this thing?

[haughty gale]

which grade are u in? and mate means friend 😄

[brazen mirage]

ohhh, I'm in 11th grade 😅

[solid barn]

thanks! ❤️

[fierce sun]

what compound is this?

(pretty sure it's H3 on the end)

[haughty gale]

i seeeeeeeee

[brazen mirage]

btw love your avatar man hahah

trynda quite op

[haughty gale]

what mine !?

[brazen mirage]

yes!!!

[odd flume]

can anyone help me with this?

[cunning crescent]

The end is C2H5, aka CH2CH3. It is a type of chlorinated ester, there are programs that you can use to get structure names from drawings. I use ChemDraw but it might cost money if you don't get it through your school/uni idk

I dont remember the naming rules exactly

[cunning crescent]

I'd guess you take m(C14) - m(N14) -m(e-) to find the answer

[fierce sun]

Cheers

[haughty gale]

can u solve this for me ? i tried just cant do it

[thorny gyro]

Avarage Atomic mass of cl is 35.5 u calculate it's mass in gm and atomic mass of the element

[vagrant parrot]

Can anyone help me with questions 10 and 12

[plucky mango]

I need help with this problem

[ivory spade]

10. A. 37.7 cm^3
11. B. 8 dm^3

[white wasp]

Is here an electrical engineer?

[native hatch]

Do you know the answer so that I can recheck first?

[vagrant parrot]

Can you explain for me how you found them?

[ivory spade]

okie, in q10, density is given 1/2 mol / dm^ 3
Vol.(in dm^3) x Density = Moles
Moles Required = 2/106 moles
Volume = 2 x 2/106 dm^3
and 1 dm^3 = 10^3 cm^3

Volume = 4/106 x 10^3 cm^3

[ivory spade]

q12. acc to the reaction if 2 moles of Al react then 3 Moles of H2 is produced

that means in 6/26 moles of Al React then 9/26 moles of H2 should be produced

so volume 9/26 moles of H2 at RTP = 9/26 x 24 dm^3 = 8.30.... approx = 8 dm^3 (as it was the closest matching answer i am not sure about the RTP Values but i took it as 24, as i am used to taking 22.4)

[haughty gale]

it got 3 phases

[ivory spade]

7/5 sqroot (a x S / 2) [not sure i just tried once]

[haughty gale]

thenks man ❤️

[thorny gyro]

u guys know projectile motion

[glad pulsar]

1. apply equation of motion in vertical direction at highest point v= 0 and acceleration is constant throughout (which is g = 9.8 m/s) v2= u2+2as
2. now apply equation of motion in horizontal direction as no acceleration in vertical js apply ucos50t= 7 m and get the time

also man i doubt that angle will be 30 not 50

[thorny gyro]

thanks I appreciate it

[thorny gyro]

let me gather my thoughts

[static flicker]

I'm not getting this one, if anyone can explain how it's done it'll be a great help

[unique fjord]

Thanks jayyyyy 🫂 🫂

[static flicker]

"Iodine oxides I2O5 and I2O7 are insoluble solids and decompose on heating" is this statement right ?

[plucky mango]

can anyone help with this problem, Please?

[wraith moss]

Iodine doesnt forms I207

And I205 is soluble in wter and decomposes to vapour Iodine on heating

https://en.m.wikipedia.org/wiki/Iodine_pentoxide

[wicked brook]

Guys help me out

[wraith moss]

( if anything is wrong pls correct me)
But i think they are-
1.
3,3-dimethyl Pentan 2-ol
2 .
2-bromo 3-methyl but 2-ene 1 ol
3.
3-phenyl Prop -2ene 1 ol
4.methyl tert butyl ether
5.
2 phenyl ethan 1-ol
6.
2,4 - dinitro phenol
7.
2 methyl Propen3-ol

[wicked brook]

I guess this is correct for 3rd qn

[wraith moss]

Hmm. But the numbering is wrong . hydroxyl grp is given more priority while numbering

[wicked brook]

Yup i made a change

[jade wraith]

does anyone know how we solve this

[cunning crescent]

That question certainly said words

[potent shard]

Paracetamol

[wheat narwhal]

man, i cant understand how does a rear wheel drive car works?

[wheat narwhal]

my book says, "while a vehicle is executing a curve, frictional forces providing necessary centripetal force acts only on those wheels that are steered." can anyone please give me a crisp/brief explanation to this?

[quiet reef]

Any help with both the question 6 and 7

[thorny gyro]

Anyone do competitive programming?

[steep copper]

nope, want to start tho

[sweet vapor]

hi, this is for revision purposes, can anyone please help me confirm if this is correct? if not what should i do differently? thanks

[haughty gale]

?

[ivory spade]

14?

[haughty gale]

lemme check

[ivory spade]

okie

[haughty gale]

DAMn

u right @ivory spade

[ivory spade]

ohh

u want written solution?

[haughty gale]

i mean i have it now so 🙂 thanks but no 😄 sorry if its rude

[ivory spade]

oh its okie dokie no worries

[ivory spade]

can you explain how are we supposed to use tao here

i cant understand the integration limits here

[quiet reef]

tao is the time between 2 successive collision of an electron in a crstal lattice

[ivory spade]

yes

so steady state velocity means

velocity at t = infinity

or

do we have to find avg velocity

[quiet reef]

avg vel i guess

[sonic flint]

has anyone used these? curious if it's used in college or uni? (it's called a french curve)

[ivory spade]

3rd option

[native hatch]

Is friction 2N or 20 N?

[native hatch]

Plus you have used work energy theorem but included the work done by friction force (non- conservative force).
The KE in the theorem comes from the work done by conservative forces).
Correct me if I’m wrong. 🙂

[native hatch]

I think v should be 10m/s.
You can simply use Ui+Ki = Uf +Kf where ki=0 and Uf=0
Ui= mgh = 5105 and Kf= 1/2 * 5 *v^2

[wraith moss]

<@&717391911132069929> ?

[grim matrix]

Oop what was it

[thorny gyro]

guys, can any1 explain why magnesium's electron structure is 2, 8,8,1 instead of 2,8,9 as the third orbit can hold up to a maximum of 18 electrons. HAs this got something to do with the aufbau diagram and finding the energy levels of each orbit by the schrodinger equation? pls help. I'd really appreciate it. 🙂

@everyone

if it works

lol

@grim matrix

can some1 pls help

sry for pinging tho

😦

[grim matrix]

hey please don't ping everyone, try to be patient someone always reads this chat

[thorny gyro]

sry

sir

[grim matrix]

i'm not a sir

lets see i do chem i can maybe help

[thorny gyro]

ok

are u seeing my question>

?

[grim matrix]

yep

[thorny gyro]

kok

ok

[grim matrix]

do you mean the configuration?

[thorny gyro]

yep

like

magnesium

configuration

is 2, 8, 8 ,1

why it isn't 2, 8 ,9

?

[grim matrix]

1s2 2s2 2p6 3s2

cuz the electrons in the s and p orbitals can only go to 8 there

2 in 2s orbital and 6 in 2p orbital

you follow the chart until all your electrons are used up

[thorny gyro]

ok

this is the aufbau

diagram?

right

?

[grim matrix]

yup the aufbau principle

[thorny gyro]

ok\

thx

🙂

[grim matrix]

no prob :))

[thorny gyro]

So, how'd this become 1.25 x 10^-4 from 10^3

[thorny gyro]

it is simple man

first take the 10 to the power 3 in the numerator

it will give u

0.125*10^-3

in writng things in standard from

the digits apart from the exponenet 10 one is supposed as a

this a needs to be bigger than 1 but samller than 10

so we multiply 0.125 with 10 whihc makes it 1.25

if we multiply it on one side we will divide on the other side

so it will be

[blazing horizon]

pls what is the answer for the first question

of the friends

[thorny gyro]

(0.125*10) * (10^-3/10^1

)

so then u get the answer

and because it is division

ypou do -3-1

so

=

-4

[blazing horizon]

help in these questions plz

A car is moving at 7 meters per second and later speeds up to 15 meters per second in 10 minutes. What is the acceleration of the car?

[thorny gyro]

I think it will be right side as he is saying OF A so take it from A's perspective @blazing horizon

@blazing horizon if u r taking it from ur perspective then it is left

but i think right of a is the answer

[thorny gyro]

just apply accelration formula

[blazing horizon]

just what is the answer broo plz

[thorny gyro]

0.0133

do u know how to say thank you?

@blazing horizon

[blazing horizon]

yes thank a lot i really appreciate this

thank you

[thorny gyro]

ok

🙂

[thorny gyro]

no prob

[cunning crescent]

@blazing horizon remember that you're not supposed to ask in this chat if you're having a test, just for revising :)

[blazing horizon]

it's not a test i just have no time to revise

[thorny gyro]

clapped

[cunning crescent]

Alright, just making sure

[thorny gyro]

ok

[thorny gyro]

Aight, but how did 10 get -4?

[cunning crescent]

Do you know logarithmic values? 0.12510^-3 = 1.2510^-4

[blazing horizon]

can anyone help me with this question plz
What is the gravitational acceleration when a 30 Kg object has a 14 N weight in that area?
is the answer 0.467 ?

[cunning crescent]

Seems right

[blazing horizon]

ok thnx

[sullen sun]

hi! can somebody please explain the concept of general relativity? and if it is an evolution of understanding of the law of gravity?

[near wraith]

xd

[potent shard]

why search every question on google

[austere cedar]

Hi guys can anyone suggest some original cartoons made on the topic cyber crime

[modest oracle]

The only thing that pops in my mind is the anime PyschoPass. To be honest, it's more about "cyber" and "crime" than "cyber crime", but maybe that could do. Hope it helps

[kind marten]

general relativity is indeed an evolution of our understanding of gravity, after einstein's paper was published and physicists started accepting his theory they realized that gravity is not a force, but a consequence of objects moving in space-time. they warp the fabric of space-time (keep in mind that its 3d and that fabric is oversimplification) and hence all other objects in their path are affected by this warping, including light, and its called the curvature of space-time. it's essentially a geometric approach to gravity and explains how bodies are attracted to each other in the universe.

sorry for the lengthy response, if you have any questions lmk

[paper maple]

right side of a

[austere cedar]

@modest oracle thanks you so much

Hi guys can anyone please provide some information about
Self defence by animals and plants through chemical warfare

[wanton shale]

hey...am having some doubt with a kinematic AS level question..can someone please help me?

this is the question...how do we do it?

So, actually, this was a distance-time graph, and the gradient is 10.5cm2-

[raven meadow]

Acceleration is velocity / time . But it's also double differentiation of distance w.r.t time

This is type of question also related to banked road??

[keen vector]

Anyone please

[raven meadow]

Okay wait

[hybrid rose]

Take two parts first when the block moves left it's period would be 2π√m/2k, but it is on the left side for only half of the time so it's π√m/2k, now when the block goes right only spring force will act on it so it would be π√m/k

So total (√2+1)π √m/2k

[keen vector]

Thank you soo much for this🤍 🤍

[magic warren]

how is it pi rtm/2k one side and pi rtm/k on the other?

is it because of the different strings

[hybrid rose]

String can only exert force when it is stretched (in this case it will happen if block moves left) , when block is on the right side string will slack off

[magic warren]

ohh okay makes sensee, thank you

[hybrid rose]

👍

[wanton shale]

this is how the whole question looks like

[thorny gyro]

i have a test tom and im having trouble in understanding haplod dilpoaid and all the chromosomes division in meiosis and mitosis

pls help

[wanton shale]

am sorry I cannot help because I don't take biology. But I recommend you to watch youtube videos on that topic. Maybe you'll understand.

[celest gorge]

campbell biology is good reference book for that (it's bit lengthy though).

[thorny gyro]

is it like complicated?
imn 14 lol

[thorny gyro]

np ty anyways :)

[celest gorge]

language of the book is not so difficult, but topics are covered in more detail. maybe you can try and study it if you find it suitable for your needs, else search some other sources on web.

[thorny gyro]

my board dosent care abt knowledge
all they care abt it keywords
so i need to study from the book i hv
if i write something else i wont get marks 🤷‍♂️

[celest gorge]

ok. good luck.

[wanton shale]

what board do you take?

[thorny gyro]

icse
indian

[wanton shale]

ooh...alright! what std are studying?

[nocturne wave]

what you can try is looking up schemes with pictures of the cell division, visualisation really helped me to understand the differences!

I hope this helps with meiosis vs mitosis

and here is an visualisation of haploid vs diploid :))

[sick raven]

Anyone knows why being Deuterostome was an evolutionary achievement? (to the phyla Echinordemata and Chordata)

[tulip otter]

Hii can you help me with this question
Assertion :Alkylbenzene is not prepared by Friedel-Crafts alkylation of benzene.
Reason : Alkyl halides are less reactive than acyl halides.

[hybrid rose]

assertion is wrong byt reason is right

But*

[hoary kite]

can u explain...i dont get it

[tulip otter]

ohh..can i know why..

(a) both Assertion and Reason are correct and the Reason is a correct explanation
of the Assertion.
(b) both Assertion and Reason are correct but Reason is not a correct explanation of
the Assertion.
(c) Assertion is correct but Reason is incorrect.
(d) both the Assertion and Reason are incorrect

[hybrid rose]

Alkyl benzene is prepared by freidal craft reaction

[tulip otter]

actually its formed not prepared r8?

[hybrid rose]

Nah it is an example of EAS

Electrophilic aromatic substitution

AND Acyl halides are more reactive than alkyl because of carbonyl bond

[hoary kite]

yes yes that i can get

but in the options,

she gave like

[tulip otter]

yeah reason is correct...but how can you say assertion is wrong

[hoary kite]

(a) both Assertion and Reason are correct and the Reason is a correct explanation
of the Assertion.
(b) both Assertion and Reason are correct but Reason is not a correct explanation of
the Assertion.
(c) Assertion is correct but Reason is incorrect.
(d) both the Assertion and Reason are incorrect

if assertion wrong means reason should be wrong acc.to ques right

[hybrid rose]

Hmmm , ok benzene+ R-Cl /alcl3 gives - R-Ph

[hoary kite]

but if we subs anything other than ch3 instead of r, wouldnt the reaction be difficult?

[hybrid rose]

Nope , it is still feasible

Well sterric factor will increase but that would be when R will be too large

[tulip otter]

The monoalkyl derivative first formed readily undergoes further alkylation at a still greater speed to produce polysubstituted products r8?

[hoary kite]

ooh yea i get it

[hybrid rose]

Another factor will be carbocation Stability

[hybrid rose]

Um yeah it will be more reactive than only benzene but para would be major if R is big

@tulip otter just asking to check the question maybe the assertion is positive statement?

Then it would be b

[hoary kite]

i think its B but cant get the proper reason..could you explain a little simple?

as to y assertion is correct

[hybrid rose]

If assertion is positive statement (negation of current one) , then it would be correct

In friedal craft reaction

alkyl halide in presence of Lewis acid forms alkylcation , which reacts with benzene

[hoary kite]

yes..

[hybrid rose]

Pi bond of benzene attacks the carbocation

Forming Wieland intermediate

Then it loses hydrogen to form a pi bond

[hoary kite]

oh okay

[hybrid rose]

Then you get the product alkylbenzene

This reaction mainly depends upon carbocation Stability

[hoary kite]

oh okayyy,,got it!

Thanks!

[hybrid rose]

Np

[hybrid rose]

Correction , just checked , R.D.S is Attack of benzene on carbocation , so sterric will affect it too

[hoary kite]

Okayy

[tulip otter]

@hybrid rose thanks!!

[hybrid rose]

Np👍

[haughty gale]

Whole solution pleasee

[modest oracle]

Using trigonometry :

[modest oracle]

a = ( 4 sqrt(2) cos(45°), 4 sqrt(2) sin(45°) )
b = (0,-15)
c = (-15cos(37°), 15 sin(37°) )

From there, just add the x- and y-components of a,b and c (using the appropriate coefficients 1, -2 and 3 given in the question) to get the resultant

[midnight crest]

What is the difference between water at 0 degrees and Negative temperatures? eg -34

[stable sand]

is it redox or just oxidation reaction
S + o2 > SO2

[fast fable]

what do you mean? and is it pure water or water + something ?

[cunning crescent]

As its a full reaction snd not a half rx, it is a redox reaction. S oxidises, O reduces

[modest oracle]

Below 0°C, water is solid (ice)
Above 0°C, it is liquid

[stable sand]

thank you

is 2Mg + o2 > 2MgO also an oxidation and combination reaction

[cunning crescent]

All reactions where electrons are transferred are redox reactions, it is not possible to have an oxidation without also having a reduction

[cunning crescent]

So this reactions is also a redox reaction

And example of an oxidation reaction is a half reaction: Mg -> Mg2+ + 2e-

Whereas the reduction is the other half reaction: O2 + 4 e- -> 2O^2-

[digital saddle]

what are these dots? are these lewis dot structues?

[modest oracle]

Two dots represent a pair of electrons that doesn't like the corresponding atom to another

Example for H2O (right circle on your screenshot) :
Oxygen atoms can form up to 4 simple links, but H2O only has 2 H-O links. Put simply, we represent the two non-linking pairs of electrons by double dots in a Lewis structure

Actually, it is a little more complex than my "it's like a notation" answer, and I highly encourage you to search about it to deeply understand what valence and linking have to do with electronic pairs

@digital saddle

(Disclaimer : I haven't double-checked my answer like I usually do, and only worked from memory. Any correction is welcome)

[digital saddle]

thanks

i just forgot about it and was confused thanks for clearing my doubts

[thorny gyro]

hey yall pls help me with this question

[hybrid rose]

Uhhhh, conserve momentum in +ve z direction , you will get the velocity of combined charges in +ve z direction , now Magnetic field is in +z direction so it won't affect this velocity , from initial condition find the value of magnetic field , now find new radius of circular part then find what would be it's coordinate in x&y axis , for z it would directly be v ×t (v = velocity you got after conserving momentum along +z)

[thorny gyro]

okay im gonna try using this method

[hybrid rose]

Yeah try it you should get the answer

[thorny gyro]

omg i got it thank u sm

[hybrid rose]

Good job !

[stable sand]

what's the diff between gustatory and pappilae

can i write pappilae are the receptors for the sensation of taste

[wind plinth]

Could someone help? If I have a closed electric circuit that's positioned in a magnetic field, does a magnetic force affect the circuit?

[modest oracle]

A closed electric circuit involves moving charges (v ≠ 0). Therefore, via Laplace's formula (F = q v*B), the circuit undergoes a magnetic force

[rare shadow]

Yes if it is a conductor .it will experience a force. Current is rate of flow of charges. As when a charge moving with a velocity is placed in external magnetic field ,it experience a force,F=q(v×B) ; as in a circuit current is there due to flow of charges.therefore charges will experience a force .hence due to all charges the conductor will experience a magnetic force.

[woeful talon]

In a pulley system, when we pull the string at one end, it moves downward because of direct contact of our hand and string OR the string moves after the effort gets reduced at pulley then the friction caused due to it(reduced effort) causes string to rotate/move.

[hybrid rose]

We don't directly exert force on pulley , what rotates the pully is the tension of the string

[thorny gyro]

Dots are lone pairs(e-) .it's not Lewis dot structure.

[thorny gyro]

What are cathode rays??? Pls ans in a simple way

[timid raptor]

Hi anyone know why i cannot say ‘ gas is produced ‘?

[cunning crescent]

Maybe because writing that it's released suggests that the gas was already in the substance, whereas gas is produced suggests that the substance is losing mass because it is turned into gas

[timid raptor]

can i know how gas is in the subtance? Do you mean carbonate -> CO2 smth like that?

[cunning crescent]

I mean like, f.ex. a glass of water with bubbles in it - that's gas in the water being released when the bubbles burst at the surface. Whereas a boiling pot - the bubbles are produced first by increasing the temperature and making liquid water into steam, and then they are released into the atmosphere

Honestly it's a very fastidious correction imo

[timid raptor]

hm alright.

Thank you

[reef flume]

ı have some general chemistry questions is there anybody who can solve these problems?

[thorny gyro]

lone pairs of electrons so basically the valence electrons that are not involved in bond formation

[acoustic bobcat]

isn't oxidation state directly proportional to acidic nature?

why is the answer 4,can someone explain...thank you

[weary quest]

Can anyone help me with grade 12u chemistry??

I just want to get my answer double checked if it’s right or not, please and thank you!

[modest oracle]

Send the question here, someone will give you their answer :)

[cunning crescent]

It's not in my head but I would guess its also connected to electronegativity (and possibly size) - think Lewis definition of acids/bases