science-help

[agile torrent]

now when you mean increase linearly, does that mean it speeds up?

[noble marsh]

for example

acceleration zero --> the car always go at the same speed over 100km
constant acceleration --> the car start at 0km/h lets say, and speed up by 10km/h every 10 min until it reach 100km

[noble marsh]

yep speed up without variation

[agile torrent]

ohhhhhh gotcha so like the velocity would change every 10 km/h which would be constant, its not like going 10 km/h then 15 km/h every 10 mins, correct?

[noble marsh]

yeah u got it

[agile torrent]

yayyyyy thanks so much 🙂

[thorny gyro]

how do u define facilitated transport and passive transport?

are these the same things?

which molecules moves across the membrane through facilitated transport?

[hearty depot]

Hello! May I ask if you know which book I can read to learn about gravimetry?

[white fern]

you can search, there are many on the internet...

[white fern]

You can get books at your university..

[dusky garnet]

.

[sudden steeple]

can anyone help in this question

[twin mist]

b. Hopefully this helps

[sudden steeple]

thanks

[deft cove]

hi. did someone had work with spectrocopy lines?

[thorny gyro]

Cool

[restive valve]

Work is an amount of energy. They both have the same units.

[thorny gyro]

lads help me out here

why does this not display resonance

i am told that it is about the Ns not following the 4n+2 rule but i cant see how that is

any chemistry buffs please explain this

everyone wants to be the druglord heisenberg no one wants to be chemistry teacher mr white

[thorny gyro]

there are 2 lonepairs
anti

[thorny gyro]

why is this electron rich

are there not 4 methyl groups giving off - inductive effect?

4 of them and only 1 NH2 resonanting

[thorny gyro]

M>H>I

[thorny gyro]

methyl grp is giving hyperconjugation effect btw

[thorny gyro]

whats that

[thorny gyro]

?

i havent been taught this stuff can u explain

mesomeric>hyperconjugation>inductive

mesomeric eff is a type of resonance effect

[thorny gyro]

is this '-' implying -ve inductive eff?

then you are in the wrong

methyl grp is also giving +ve inductive effect

[thorny gyro]

yes

the shared pair of electron is shifted towards the ring from the methyl group

wait

ohhhh yeah mb

making it electron rich

its +

[thorny gyro]

yep

imma leave this m h i stuff out for now i havent been taught this

i have made a misake

thanks brother

[lime plaza]

help how todo

i do not understand this question

[thorny gyro]

i dont understand this

why is it methoxy

havent the O- groups been deprotonated?

[thorny gyro]

What will be answer of question 35?

[unique cosmos]

At 230

I would say that the letter A is the answer

[thorny gyro]

Ok, thanks

[torn oar]

use sin and cos

[twin mist]

Can you take picture of the question ?

[thorny gyro]

How did you find the x component of g

[valid oriole]

What's the difference between allosteric inhibition and non-competitive inhibition

[urban wave]

Why do precipitates behave differently towards acid?

[ebon vine]

help

how do i answer b, c,d

i already know radius=0.866 and theta = 30

[wind moth]

is ASTRONOMY a science?
if yes here i have a question

Two places lie on the same parallel at latitude φ 60°, finnd the distance d between these two places, if the time difference between them is 3 hours?

[thorny gyro]

hello,why do we transfer the zygote formed during cloning to a different carrier sheep ? can't we put the nucleus of the breast cell in the sheep from which we took it or the egg cell from which we took it

[upper island]

help pls

[stuck mountain]

guys

can someone help me?

which metal can resist?

[wraith basin]

guys can someone explain complexes in chemistry to me?

why does the 4d orbital not follow hund? and how do i know it's sp3d2?

[twin mist]

First i don't think this molecule is stable, secondly Fe needs to have sp3d2 for forming 6 bonds.

[wraith basin]

ahh i get the sp3d2 now

does it make a difference if i say d2sp3?

[twin mist]

They are not the same

For its to be d2sp3 d should be from (n-1)th shell

[wraith basin]

ohhh so it'd be 3d

and 4d would be empty

then it'd bond with a strong ligand

[twin mist]

Yes

[twin mist]

I dont know whats that though

[wraith basin]

hahaha it doesn't matter i have another example where it's d2sp3 so i get that now when i look at it

but just one more question😭

why does it go from 4p to 4d and not 5s?

[twin mist]

Because they need to be next to each other for making it, when you write it like 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 ... you are writing them based on energy not their distance to the nucleus

[wraith basin]

OOHH

YEEEH

THANK YOU SO MUCHHHHHH!!!

you're so nicee

[twin mist]

No probs sir

[little holly]

Yo i am studying in class 11 and currently studying phycis chapter fuild
Can anyone help me with that chapter

[twin mist]

You mean fluids?

[junior tangle]

Using the 14 bit model (5 bit for exponent & 8 bits for mantissa) what is the decimal number representing this binary (00111011100000)
(hint: the binary number is normalized and bias is used). HELP

[surreal needle]

Anyone know how to determine if a food sample was derived from GMO?

[forest falcon]

hello, I need bio help for gene mapping. I have two answers for this but map 1 is not in congruence with the order of gene appearance in Hfr2. Map 2, on the other hand, does not consider gene time appearance, but the order of genes make sense for all three strains. Any tips/ ideas where I could be wrong?

[little holly]

ya

[twin mist]

Allright

[deft summit]

IUPAC name w/ numbering

[eternal marlin]

Why after heating this compound with only aldehyde grp forms? in red ink

[thorny gyro]

dehydration?

also the h is taken from the -cho carrying carbon. why? well because the product is resonance stabilized and hence more stable

[eternal marlin]

soka

[odd ibex]

we don't have to count those carbons in circle?

[gaunt swift]

I need some help with 2 b ii. Please, I have found nothing online and I really need help please

[solid walrus]

Analog electronics help

[warped gulch]

hello

[little holly]

Yo can anyone give me prove of archimedes principle in short, our sir takes board test so i need it short and ple give it as soon as possible

[severe dew]

Can someone help me out

[zenith rose]

anyone wanna tackle this?

[noble marsh]

Its a principle so there is no proof of it, we just believe it and the day someone with an experience can demonstrate that its false, the principle is no longueur true

[little holly]

But there is derivation on this topic

?

[noble marsh]

wdym ?

[little holly]

wait

See there is derivation on this principle

I can't understand what happens in this derivation so i asked for help

[noble marsh]

Which line u didnt understand here

[little holly]

Entire derivation🗿

[noble marsh]

dm

[tiny plank]

???

[severe dew]

Can someone help me out

[thorny gyro]

->Magnesium Chloride + Water

[spark hill]

İs the tension 150?? Do you know answer if it is true answer ı am gonna explain @tiny plank

[tiny plank]

Explain it

[twin mist]

It is

[twin mist]

I am drawing it in a sec

[thorny gyro]

can someone hel me out here

what mechanism would this be

[spark hill]

@tiny plank We separate the rope tension into fx and fy. Then we get torque from the center of the beam. Fy and 100 have no effect as it passes through the center of the torque

[twin mist]

It should be 300 since it is asking tension from the rope

I forgot to draw it though, thank you

[spark hill]

Where did ı wrong ,could u explain?

[twin mist]

Nothing wrong you just need to find T from T=Fx.sin30

Which is 2*150=300 =T

[spark hill]

Ohh okay thanks for the answer😊

[twin mist]

No probs, are you studying for uni entrance exam?

[spark hill]

Yeahh, how did you know?

[twin mist]

You are Turkish and in this server so

Not much of a hard guess it is :)

[spark hill]

How do you know ı am Turkish 😂?

[twin mist]

1."ı" 2.Bio 3.Name

[spark hill]

You are a good observer

[twin mist]

No sir i am also Turkish that is why

[blazing sage]

[chemistry] anyone knows how to find how many grams of a compound/element are made from X grams of X compound/element? like, i know how to do it, i just have a math that doesnt add up so i got stuck

[ember quarry]

you multiple the molar mass of element to the molar mass of total in compound, we get percentage of that element , then mutiply the percentage of element to X

we get m of element

For example find C in 35g CO2, you calculate the total molar mass is 46, C is 12, you get 12/46 = 26%. Then 26% * 35 = result

@blazing sage

[thorny gyro]

maybe use stoichiometry?mass mass analysis

[ember quarry]

if calculate compound in reaction can use stoichiometry

[thorny gyro]

yes

[thorny gyro]

dm the question, I can help

[ember quarry]

it's ok bro, I just instruct the guy above

My major doesn't have chemistry:))

[thorny gyro]

and I am still in school

[ember quarry]

nice

[thorny gyro]

guys

say if the NNT of a comparison between 2 groups is really high

where one group is a good treatment and the other group is a better treatment

what does it mean

can someone make some sense out of that?

[ember quarry]

What is NNT stand for?

[feral kindle]

can someone explain the atomic mass how does it work

[light quail]

Yeah , whats your problem tell me

[feral kindle]

ok i dont get the difference between Ar and Me

Mr*\

[light quail]

Ar is An element which belongs from the noble gas group , it is called "Aragon"
And Me is stand for Methyl

[feral kindle]

in chemistry of course

no bro

i am talking about mass

like AR

Ar

is the atomic mass

Mr

[light quail]

??? Explain it clearly ??

[feral kindle]

wawit

wait

[light quail]

R u talking about atomic mass ?

[feral kindle]

atomic mass, the quantity of matter contained in an atom of an element

yes

[light quail]

Then what can i help you in atomic mass

[feral kindle]

like help me understand how it works

[light quail]

It helps in many ways
Can you send your questions ??

[feral kindle]

yes wait

explain how the atomic mass work

thats the question i have

[light quail]

Atomic mass is the sum of total no of proton and neutron of an atom

[light quail]

The mass of one atom of carbon-12 the atomic mass of carbon-12 is exactly 12 atomic mass units. The mass of one mole of carbon-12 atoms is exactly 12 grams; its molar mass is exactly 12 grams per mole

[feral kindle]

and the Z is the total of neutrons in a atom

right?

[light quail]

No brother,

Z is atomic no
And it total no of proton or electron

[thorny gyro]

Help me outtt

[rough lodge]

Damnnn!! Can't stop laughing 😆
Electrical this sem?? Enjoyyyyy 😆 😭 🍀

[gleaming moss]

could someone help me with Lineweaver-burk plot

i understand nothing 😩

[last remnant]

Has anyone tried making a flail chest model? (For my physiology class.) Basically, a pathological lung model that moves paradoxically. I tried deforming my bottle under heat…Made an “H” with straws and some variations of blocking the hole, poking a hole on the straw or the balloon. Eveb asked my parents for tips resulting to them almost fighting lol. But seriously, tips? Anyone? 🥹

[thorny gyro]

guys

if neurons are firing tonically, what does it mean?

ive looked at definitions but i cant understand them

[thorny gyro]

Someone please help me

[thorny gyro]

"Singularity" and "Post Singularity"

[thorny gyro]

😭😭😭😭 dont laugh at my suffering ok

[thorny gyro]

THANK YOU SO MUCHHH

[thorny gyro]

guys can someone help me out with functional groups

say there is a pyrrole group attached to a benzene group

wht would you call it

[lime tundra]

How do I find IB?

Might be important to say that B = 300 = IC/IB

[mint stirrup]

I have a question related to simple harmonic motion, it says:

Write the equation of the wave taking as the origin of times the instant in which the end of the rope has zero elongation and positive velocity.

in this case, to write the ecuation, do i need to calculate the initial phase?

[hot prairie]

pls help

[quasi tangle]

is the cathode the one that's always on the right?

[rough lodge]

@thorny gyro this should be revision for you

[blazing sage]

anyone for a molarity problem?

[cunning crescent]

Anyone have good resources for determination of molecular structure by mass spectrometry? Masters/Uni level

[crude bridge]

pls help

[neon osprey]

I have to explain why the olm lost its vision in Darwin’s theory and Lamarck theory can anyone help

[eternal marlin]

So the ques is to convert using grignard reagent into propanoice acid

I hv converted into propan-2-oic acid so i was wondering if could apply rearrangement the nxt process to shift the alc grp to the nxt c atom

(Idk much abt rearrg but ik that it has some function related to shifting or something like that)

[thorny gyro]

I will kill you😭

But I don’t have this yet, second sem probably

[rough lodge]

O.o
So you were helping someone out then?

[subtle goblet]

ain't OH already attached to the more stable carbon?

[thorny gyro]

What

No

I have basic electrical as my subject

These notations seem out of my league

[rough lodge]

Don't worry. They won't bother you again. Next sem it will be electronics I guess, which is relatively easyy

[thorny gyro]

Hopefullyyyy

Electrical SUCKS

[rough lodge]

Less than a month to suffer through this trouble

[thorny gyro]

Yeahh my ESTs begin on 2 Jan and end on 14th

[rough lodge]

SO no studying for now na? XD

College engineering implies going to the library for the last five days before an exam and studying 😆

[thorny gyro]

Hahahah I still have my msts going on, this sem is a joke

[fair sierra]

Hey all! Hope the semester is going well for you all. Finals are approaching for me and I found a stark difference between "content taught" and "content tested", so I've made a YouTube channel where I'm solving typical exam questions. You can check it out here, https://www.youtube.com/@chemicalengineeringsolved
Let me know if you have any video requests, and I hope it helps you all

[odd cosmos]

could anyone help me with a question on virial equations please 😭

i keep getting 3936kPa for Co2 which is evidently wrong

[void blade]

Hi there, I have a huge problem with my numerical methods assignment. I need to find an approximation for a given function using two different functions in MATLAB. I managed to succeed with the first one but I have a huge problem with the other one. I attached a rough translation of the assignment. As you can see on the charts, the first one looks great but the other one is huge. I'll send my code in the next message

w = 100 * pi;
fi = pi/3;
A = 50;
T=0.001;
a = w*T;
dist = 0.4*A*(0.5-rand(1));
mnoznik = 1;
f = @(t) A*sin(w*t + fi);

% Discrete vectors of x and y values for initial function
x = linspace(0, 0.02, 21);
y = linspace(0, 1, 20);
for i=1:21
    y(i)=f(i * 0.001)+dist;
end

% ~~~~~~~~~~~~FUNC 1~~~~~~~~~~~~~~~~
% f ~ a0 -a a1(ak) + a2(ak)^2 - a3(ak)^3 + a4(ak)^4

H = zeros(21, 5);
for i=1:21
    H(i,1) = (1);
    H(i,2) = (-a*x(i));
    H(i,3) = (a*x(i))^2;
    H(i,4) = (-a*x(i))^3;
    H(i,5) = (a*x(i))^4;
end
X1 = (transpose(H)*H)^(-1)*transpose(H)*transpose(y);
f2 = @(k) X1(1)-X1(2)*(a*k)+X1(3)*(a*k)^2-X1(4)*(a*k)^3+X1(5)*(a*k)^4;

% ~~~~~~~~~~~FUNC 2~~~~~~~~~~~~~~~~ 
% f ~ a1 * sin(a*k) + a2 * cos(a*k)

H2 = zeros(21, 2);
for i=1:21
    H2(i,1)=sin(a*x(i));
    H2(i,2)=cos(a*x(i));
end

X2 =(transpose(H2)*H2)^(-1)*transpose(H2)*transpose(y);
f3 = @(k) X2(1)*sin(a*k) + X2(2)*cos(a*k);


plot(x, y, '.', 'MarkerSize', 15)
hold on

fplot (f2, [0, 0.02],'--', 'linewidth', 1)
%fplot (f3, [0, 0.02],'--', 'linewidth', 1)

hold off```

[fringe kraken]

Just gonna put this in here.
When initializing a char array in C does it already have memory allocated to it when you initialize it like:
char * array{500];
confused cause technically you are reserving 500 char spaces for it right?
Basically I want to know if when i say char * array[500]; do I need to allocate memory for it to hold a string before I use memcpy() on the array

[fringe kraken]

It has been figured out ^

char * array{500]; already allocates mem to the stack

[unique shell]

hii

has anyone taken IB ?

IB physics

[fallen radish]

Would anyone be up to reading over my one-page essay and checking for any mistakes? It's for biology...

[honest thunder]

im in ap physics

[cold axle]

same

[thorny gyro]

im in regular physics and it's still kicking my ass brooo 😭

[stable sand]

Chem help equilibrium pls

||In a container of 1 L Which contains 4 mol o NH3 and 6 moles of H2S at equilibrium. Calculate the number of moles of H2S that should be added such that at new equilibrium, moles of NH3 decrease by 50% o its value at previous equilibrium.||

||kc=12||

[molten dune]

I need help with question 8

[cobalt crest]

Idk. My english is not that good

[cobalt crest]

Btw, what educational level is this problem?

[molten dune]

undergraduate

[shut hornet]

A block of 240g mass is pulled by a massless string over a pulley that is attached to a mass of 100g. Assume acceleration is 1.33m/s^2. What is the coefficient of friction?

can someone help me with this

[thorny gyro]

So why would you say anything at all in the first place lol

[thorny gyro]

Okay this is general chemistry I'm assuming. This is a Polyprotic Base/Acid problem. Meaning, you would use Ka2 = (products)/(reactants without water) then after you get the H3O concentration you can use that to get the pH

[molten dune]

@thorny gyro do I have to use Ka2 only to calculate the pH for all point?

[random trout]

does anyone know wobble hypothesis

please help

[thorny gyro]

https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Acids_and_Bases/Monoprotic_Versus_Polyprotic_Acids_And_Bases/Calculating_the_pH_of_the_Solution_of_a_Polyprotic_Base%2F%2FAcid

This is what I used to learn the topic when I had to go through it earlier this semester

[thorny gyro]

Yes, the wobble hypothesis is essentially the reason why despite us only having a ton of codons - there are only a set number of amino acids

Because if you do the math out counting all the codon sequences possible - you would assume that the number of amino acids possible would be much greater than what we have

This is because multiple codon sequences that have different third letter positions can code from the exact same amino acid vs coding a different one

Notice how for example GUU, GUC, GUA, GUG ALL code for the same amino acid - Valine. This is because the third position here is wobbling!

[mint stirrup]

if i'm being asked the total mechanical energy of a satellite with an elliptic orbit which velocity/radium should i use to calculate it

[quick rapids]

how do they know the wavelength is 0.8

i dont get what calculation was made

[pseudo portal]

when the wave goes up and down again and back to the central point it is one wavelength, so that shows 1.5 wavelengths (1.2m) so if you do 1.2 * (2/3) to get one wavelength you get 0.8m

i hope that kinda makes sense

[quick rapids]

ohhh

ok tysm

[stoic flame]

hello

Is the angle of incidence complementary to the angle of refraction when moving from a medium of high refractive index to lower index?

[thorny gyro]

Nah man

[stoic flame]

Thank you

[thorny gyro]

yoo guys

how can i explain Standard potential and standard half-cell potential, E° to complete newbies?

i mean how can i possibly phrase it in easiest way possible

[short moon]

how newbie are we talking here? like primary school newbie or at least like high school?

well either way, i let an ai run it a couple times and this was the best i got from it. got no clue if it is correct or makes sense but maybe it helps you

"Standard potential (E°) is a measure of the potential energy difference between two half-cells in an electrochemical cell. A half-cell is a single electrode in an electrochemical cell, and the potential energy difference between two half-cells is the measure of the amount of energy required to move an electron from one half-cell to the other. The standard potential is measured in volts (V) and gives an indication of how readily a reaction can occur in the cell. Standard Half-cell potential (E°) is the potential energy difference between two half-cells when both half-cells are at the same temperature and pressure, and when concentrations of all reactants and products are 1 M. This measure is important because it allows scientists to compare the relative reactivity of different electrochemical reactions, and to predict which reactions will occur spontaneously in a given system."

i got this from openai.com maybe you can try it yourself since you got more expertise than me and maybe know how to phrase the input for it better than me

@thorny gyro

[thorny gyro]

than you so much

[thorny gyro]

high school

[worn smelt]

ik this is the most basic question

but how do you go about solving a question like this?

[robust mica]

You do what is called a dimensional analysis, since you do know all the units in the formula but the b you can figure out what b is : Fmax is in Newton which is Meter. seconds ^-2, so you type it as L.T^-2 ( For time not period and L is for length) and you do that for every variable there, in the end you will figure out what b is

(btw it's not necessary to name L as length or T for time if that confuses for now, but usually that's the way people do it)

https://en.wikipedia.org/wiki/Dimensional_analysis

Hope that helps a bit

[worn smelt]

got it. thank you so much 🙂

[robust mica]

no problem!

[worn smelt]

I was working this out and got stuck again at this part

any idea of what the next step is?

[robust mica]

I'd suggest you don't develop the square

and work it out slowly

wait nvm u can even work it out from here i think

what are newtons?

in si units?

[worn smelt]

kg.m/s^2

ohhhh

[robust mica]

Well u got ur answer!

[worn smelt]

wait ill try that haha thanks

[robust mica]

Even tho I don't recommend hmm the way u worked it out , it still works (since now u kinda want to say that b = 0 which is not the case but hey if it works it works)

[worn smelt]

haha yeah

idk how i got stuck on this for so long lol

the solution looks so short

[robust mica]

yep

Usually in physics

what's in the denominators

or when u have an addition

[agile torrent]

Using the principles of classical Newtonian physics, is an object in orbit around the Earth (for example, the Moon) in equilibrium? Explain why, or why not.

[robust mica]

it has the same units

In common english, you can't mix apples with oranges

[worn smelt]

haha yeah

[agile torrent]

A soccer ball is kicked on a level field with a speed of 15.0 m/s at an angle of 35.0° above the horizontal.

a. For how much time is the soccer ball in the air?

b. How far does the ball travel horizontally before hitting the ground the first time?

[robust mica]

Use the kinematics formulas, split the problem into a horizontal velocity (no gravity involved, this one for the second question) and vertical one ( this one will help u get the time by applying the acceleration of gravity and checking when does the soccer gets into an instantaneous speed of 0) and u'll get the answer

There are some vids in khanacademy dealing with these sort of problems!

[coarse stream]

hi guys I have to write a report about any topic in quantum mechanics i need idea or topic

[hollow sonnet]

Can you tell about that topic

[edgy scroll]

decay rates of different substances, the fact that some have a half life of mere minutes

what they decay into?

maybe nuclear reactors and how they run on uranium and maybe explore other alternatives

[worn smelt]

how do you do the b part of the question (instantaneous acceleration)?

[worn smelt]

nvm got it

[coarse stream]

oh thank you 💜

[woeful minnow]

https://youtu.be/wZ9QIeWKStQ

[woeful minnow]

https://youtu.be/PqqcwSUoQmA

[thorny gyro]

HELPpp

[dire shuttle]

is there any difference between keto and oxo prefix like any limitations when to use either of it?

[radiant yoke]

Please can anyone help me with 45 and 38.

[dire shuttle]

probably you have to use that FMC rule in the 45th one

i forgot read it like 1-2 years ago💀

[dire shuttle]

here you will use uhh that bar magnet property that a solenoid works as a bar magnet

[obsidian lagoon]

The keto prefix is used to describe a compound that contains a ketone group, which is a molecule with a carbon atom double-bonded to an oxygen atom and single-bonded to two other carbon atoms.

The oxo prefix is used to describe a compound that contains an oxygen atom that is bonded to a carbon atom. This prefix is also commonly used in organic chemistry to describe compounds that contain an oxygen atom as a substituent on a carbon chain.

There are no specific limitations on when to use either of these prefixes, and they can be used in a variety of contexts to describe different types of chemical compounds. However, it is important to use them correctly in order to accurately describe the chemical structure and properties of a compound.

[eager atlas]

i don't understand why 1,2-dichlorohexane isn't formed? can the chlorine not act as an electrophile?

can anyone help

[remote ermine]

Because in my view, Br for several reasons, in this case due to space (the Br atom is much larger than Cl, which makes it better accommodate charges) and due to electronetivity, it does not easily abandon electrons. Therefore, it is formed more easily than Cl

[remote ermine]

.

[dim stirrup]

Don't know if this is the right place to ask, but I could use some advice. I am taking my first physics class in college next semester and I haven't taken a physics class in like 4 years. I was wondering if anyone has any recommendations on some materials to go over to refresh myself before starting the class next month

[obsidian lagoon]

https://www.youtube.com/watch?v=bZLKG43Qcps

[hot ridge]

I recommend solving a few problems in dynamics, kinematics, work and energy, etc. You can find basic and well explained problems on Khan Academy. And when it comes to learning advice, don't worry if you don't understand something right away. It takes time sometimes.

[thin shoal]

anyone can help me to solve this question

1. calculate and determine the Vth
2. calculate and determine the IB

thank you:)

[thin shoal]

I'm done, thank you guys^^

[dire shuttle]

THANKSSSSSS!!

[dire shuttle]

so like can we call subsituents which are double bonded Oxygen atoms

ketones

?

isint it the same thing

[obsidian lagoon]

No they are not, here is a good example to help you correlate the 2

An ester is a functional group that consists of a carbon atom double-bonded to an oxygen atom, with a single bond to another oxygen atom and a single bond to a carbon atom. Esters are ** not** ketones, even though they contain a carbon-oxygen double bond.

This is due to ester not sharing all the same properties as a ketone. For example, esters are typically more polar than ketones and are more readily hydrolyzed (broken down by reacting with water) under acidic conditions. Ketones, on the other hand, are typically less polar than esters and are more resistant to hydrolysis. Simply having a carbon-oxygen double bond does not necessarily mean that a molecule is a ketone.

There are a few that fit the ketone rule but are not ketones. But usually... almost all double bonds to oxygen are ketones

Esters,Elons,Epoxides,Anhydrides,Peroxides are not Ketones but fit the rule.

If your in O chem you will only need to know Esters,Elons are not ketones.

[final cloak]

I got the first one but i cant figure out the 2nd one, can anyone help?

i tried 1/2 m v^2 and swapped v^2 for (10.2^2 - 12.3^2)

[obsidian lagoon]

Part one we find Sallys KE is 7514.7 J.
So for part two, to find her new KE we plug in the new value for her velocity.
KE = (1/2) * mass * velocity^2
(1/2) * 49.5 kg * 10.2 m/s^2 = 2586.42 J
You where close but since the speed changes, and you have to find the new KE. The previous speed is un needed.

[final cloak]

I jus checked my wrok cuz i thought i did that

messed up on one of the digits 🤦‍♂️

thx so much tho

[ashen sparrow]

I have a question.

what does this mean?

[eager atlas]

which part is unclear?

[ashen sparrow]

"hereditary"

[eager atlas]

it’s when something’s genetically passed on from parents to their kids

[ashen sparrow]

Ah ok, thanks! ❤️

[ashen sparrow]

can someone help me with this? I don't understand it

[grim matrix]

I don't think B is the right answer

it should be A

[ashen sparrow]

Can you explain what it's asking?

[grim matrix]

Do you mind waiting a bit? I'm gonna try and write it down and send the screenshot

[ashen sparrow]

Only if you want to!

[grim matrix]

@ashen sparrow you should be able to solve it with this

i forgt the e in are so it just says ar in between the first brackets 💀

[ashen sparrow]

Thank youuuu sooooo muuuch! ❤️ ❤️

Also, i'm in love with your handwriting lol

[grim matrix]

Also its not really conservation of mass, try conservation of mattter

😄

[ashen sparrow]

Will do!

You're amazing!

😊

[grim matrix]

I mean mass can do

https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Basics_of_General_Organic_and_Biological_Chemistry_(Ball_et_al.)/05%3A_Introduction_to_Chemical_Reactions/5.01%3A_The_Law_of_Conservation_of_Matter

[ashen sparrow]

It all makes so much sense now

You're a great teacher

[grim matrix]

😄 chem can be fun when its explained well

[ashen sparrow]

I'm very interested in biochemistry

[grim matrix]

not many teachers make much effort to explain it well so it seems hard to a lot people

[ashen sparrow]

yeah!

[grim matrix]

oh fun! I'm not as much of a fan but i don't hate it too much haha

[ashen sparrow]

lol

[grim matrix]

I don't like to learn stuff by heart a lot

I ike to find answers by thinking logically instead of repeating what i studied, i feel like theres a lot of stuff to study in biochem

but that could just be my lack of understanding too 😄

[ashen sparrow]

I've just started studying biology but i want to study chemistry in the future as well

[grim matrix]

chemistry is where its at

[ashen sparrow]

lol yup

[grim matrix]

I might be biased 😄

[ashen sparrow]

Hahaha

[ashen sparrow]

Are you going to be studying today?

[grim matrix]

yep

i have exams shortly after new years so

[ashen sparrow]

Wanna study together?

[grim matrix]

ah sorry im already studying with people today 🥺

[ashen sparrow]

You're amazing, so you'll ace them I'm sure!

[ashen sparrow]

It's alright~

[crisp gulch]

hi! I am having problems understanding 'Law of conservation of Angular Momentum'. would someone like to help?

[obsidian lagoon]

The law of conservation of angular momentum states that the total angular momentum of a closed system (a system that does not exchange matter or energy with its surroundings) remains constant over time, unless acted upon by an external torque.

Basically, the angular momentum of an object or group of objects will stay the same unless something else changes it.

A good example of this is planets in out solar system they will keep rotating around our suns gravity intill something is acted on them. This explains stability in the solar system and behavior of spinning objects.

[hallow tinsel]

does anyone know a good method/chain of reasoning when it comes to mechanisms in ochem apart from just memorising them?

[crisp gulch]

thanks

[ashen sparrow]

I'm having trouble remembering about cytoplasts, deoxyribonucleic acid and nucleotides

How do i memorise adenine, thymine, cytosine and guanine?

[ashen sparrow]

What is a good science podcast?

[wraith basin]

what exactly do you want to memorise?

[ashen sparrow]

I want to memorise biology

[wraith basin]

nucleoTide has a phospaTe

[ashen sparrow]

PhospaTe?

[wraith basin]

you can remember cYtosine and thYmine are pYrimidine and the others are purine

[wraith basin]

yeah a phosphate chain

[ashen sparrow]

I only started studying biology a few days ago

[wraith basin]

ooohh

yeah you'll need the foundation first

[ashen sparrow]

What books do you recommend?

Documentaries?

podcasts?

[wraith basin]

uhmm well I'm native german so i don't know any books

[ashen sparrow]

Ah ok

[wraith basin]

i watch professor dave tho

on youtube

if i need anything

[ashen sparrow]

Any other channels?

[wraith basin]

but i think that may be too advanced

[wraith basin]

let me see

[ashen sparrow]

thank you ❤️

[wraith basin]

ohh the amoeba sisters

we watched some videos of them in class too hahaha

[wraith basin]

no probss

[ashen sparrow]

I'll look them up now!

[wraith basin]

there's also the organic chemistry tutor

you might find videos you need there too

[ashen sparrow]

I signed up for an Open University science course and it starts at the end of the month, so hopefully I can enroll in it

[wraith basin]

and there's a site called osmosis (but it costs a lot) you can use their free trial for one month i think (i did that) their videos are soo good but more medicine related and also kind of advanced

[wraith basin]

yess! that'd be the most effective way to learn and study

[ashen sparrow]

All I need to do is sort out my funding

[wraith basin]

i hope you'll make itt

[ashen sparrow]

Thank you! I hope so too ❤️

[wraith basin]

ofcc💕

[ashen sparrow]

There's something off about this lol. I need to choose my modules and get my funding sorted out by the 12th but it can take up to 15 days to be able to choose my modules

Well, better leave it up to fate. If it's meant to be, it'll be

[wraith basin]

ohh yeah that's shitty

i says within the next 15 days tho

so hopefully it'll take less than 15 days

[ashen sparrow]

I hope so too

[wraith basin]

i had a similar problem too

that's just typical university organisation

[ashen sparrow]

Darn

[wraith basin]

they can't do shit💀

[ashen sparrow]

lmao true that

It's nice to meet you btw, I'm Ruari

[wraith basin]

yup

ohh hii I'm marya

[ashen sparrow]

Nice name!

[wraith basin]

ruari is a cool name

hahaha thankss

[ashen sparrow]

It's Scottish Gaelic

Gaidhlig lol

[wraith basin]

OHH

coooool

[ashen sparrow]

It is~

[ashen sparrow]

Hey. can anybody help me with this?

[restive valve]

well, i guess since the amino acids don't change it would be neutral

[ashen sparrow]

Thank you!

[quick rapids]

can someone help me please

[restive valve]

Let V be the battery's voltage. Calculate the total equivalent resistance, find the net current of the circuit, and then calculate the voltages at every node of the circuit (fractions of V). Then calculate the powers consumed at each resistor as expressions of V, find which of them is arithmetically largest and from that expression find the maximum value of V for which the power at that resistor is 2 W.

[summer ember]

can anyone tell what types of bonds are available in Na2SO4??

[wraith basin]

I'd just say it's an ionic bond

and so4 is covalent bond

[wraith basin]

.

[halcyon horizon]

does anybody have websites for IGCSE revision notes? for chemistry, biology and physics.

[hallow tinsel]

physicsandmathstutor

[halcyon horizon]

thank you!!

[hallow tinsel]

np

[summer ember]

oh..i agree with u..but my answer sheet says there are 3 types of bonds so i was confused

thanks a lot marya for ur help!!

[wraith basin]

hmmm then maybe they mean na2 is also covalent?

[wraith basin]

hahaha ofc~~~

[dense tide]

can anyone help me understand, why is there (+-1) at the end, when we're calculating pKb1 values?

[obsidian lagoon]

Its the uncertainty

[ashen sparrow]

Does anyone know any good biology or biochemistry books for people just starting to study?

I'm also up for reading research papers

[thorny gyro]

desperate times

someone quick

[obsidian lagoon]

Answers
||Do it your self||

[thorny gyro]

ik i did

[ashen sparrow]

Can someone explain adenine, cytosine, thymine and guanine in the simplest way possible please?

[hot scroll]

so from my rudimentary understanding of biology, adenine, cytosine, thymine and guanine are nucleotides, and they're strung together in DNA and RNA as a sort of code for amino acid production.

In a double-helix structure like DNA, there are two strings of nucleotides that correspond to each other, so for example cytosine matches with guanine, and adenine matches with cytosine.

there are twenty (?) different amino acids that can be produced, and each one has a code called a codon (fitting), which is a set of three nucleotides together (for example, methionine, an amino acid that starts the chain, would be ATG in DNA)

i haven't taken biology in two years so please take that with a grain of salt and if anyone has a correction or anything to add feel free

[ashen sparrow]

Thank you! ❤️

[hot scroll]

ofc <3

also if you see a U in an RNA sequence that's uracil, another nucleotide that is unique to RNA

i think for all practical purposes it takes the place of T

[final cloak]

anyone know a good resource for studying phyics, i kind of keep up in class but i wanna do sell studying otusdie so im prepared for AP

[ashen sparrow]

Thanks! ❤️

[hot scroll]

i think khan academy has physics lessons now, not sure where you’re at in physics but it could be worth checking out

[final cloak]

I jus take the class and like I understand some stuff (rn we on springs and energy stuff) but like I wanna start from the beginning yk

I’m might jus watch college board videos + Kahn

[waxen sorrel]

can someone tell me is the origin of water on both sides of the photosynthetic equation the same ?

[thorny gyro]

Doubt is that why will we displace NH2 by OH?

[dense tide]

what's more distant from Cl, Rb or Na?

[wraith basin]

what do you mean by distant?

[dense tide]

Distance between elements

[wraith basin]

if you mean like geographical distance then rb is farther away

not sure if i understood your question

[dense tide]

Idk how to explain that, basically, the bigger distance between atoms, the stronger metal bonding is

If it helps

[restive valve]

maybe you mean electronegativity?

[dense tide]

Nope

[wraith basin]

cl is a non metal tho

is that a hw/textbook question?

[twin mist]

Na is the closer one, but has stronger metalic bond :))

[woeful talon]

here just by simple calculations 10^5 + 10x10^5 we get 11x10^5, but shouldnt we consider the pressure exerted by the air inside the balloon which will reduce the overall net force and hence the pressure, thanks

[dense tide]

ty, that's exactly what i needed to know

[twin mist]

Does not make any sense, but no probs mate

[dense tide]

Well, I have task only in Czech language so you won’t really understand anything

[twin mist]

I can try

[surreal cliff]

anyone have advice on what i should be taking notes on in biology for class? i don't wanna write too much and too little which keeps happening to me

[tame magnet]

Idk much ah biology but notes should usually only be a sign pointing toward a larger concept

It trains recall in a better way

Science is good cuz you can use a lot of diagrams and symbols to jog ur memory

Just write a little sign to urself that refers back to the broader concept then try remember just using that little signpost

Forgetting the words and remembering the concept will always be superior to remembering the words and forgetting the concept

[spice cipher]

i mainly just write notes to explain processes so i understand them but biology should always be about the bigger picture as sufa said^

[glossy olive]

does anyone know if eukaryotic RNApolymerases can join prokaryotic promotors?

[dense tide]

Can anyone help and show me "net ionic equation of reaction of dichromate with a ferrous salt in an acidic environment"

[surreal cliff]

ty and @spice cipher i really appreciate the help

[hot scroll]

could anyone explain letter C to me? the answer is ||8.9 seconds|| but i'm not really sure how to get there with the three kinematic equations

[spice cipher]

basically s is 300m which is told in the question, u is -10 (as it says it is moving 10 m/s upwards but the wall is moving downwards so that is why it is -10), a= 9.8 (gravity) lmk if this helps!

[hot scroll]

what do you mean when you say the wall is moving downwards?

[spice cipher]

so in the question it says the hot air balloon is moving upwards at a speed of 10 m/s
however for c we are being asked the velocity of the ball as it hits the ground
so remember velocity has magnitude and direction

if we take the ball moving down as positive (hence displacement is +300m). as we know the initial movement of the ball is upwards and hence opposite it has to be -10.

im really sorry i am not the best at explaining things!

[hot scroll]

C asks for the time that it takes to hit the ground though

i'm seeing where you get the answer from, i just think i flipped a negative sign somewhere

ohh wait now i get it

i'll try it again, thanks for your help!

[spice cipher]

yeah so write out what you have info wise for suvat, s = 300m (balloon is 300m above the ground), u = -10, v = ? a = 9.8 (gravity as ball is falling down with gravity) t = what we want

then we just need to find a suvat equation which uses s, u, a, and t to work time out

so the only equation that does that is the 2nd one which is why we use it

but lmk if you still don't get it and i shall try to help

[hot scroll]

got it! thanks for your help and patience :)

[fiery geyser]

hey, does anybody know a strategy to gain more understanding for physics? idc if it's a certain youtuber, book or something similar but somehow I have a really hard time with this subject even though I'm interested in maths and science overall 🙂 thank you

[twilit pendant]

what level physics are you doing? (w pfp btw)

[quasi tangle]

does anyone know if this is an acceptable answer or not?

[acoustic igloo]

Hey guys! This message is mostly for CS students 🙂 I'm thinking on the idea of opening a coding club at my uni, though I study economics. Could you please share your knowledge on how coding can be applied in economics/business. I would really appreciate to read your opinion on this!

[fiery geyser]

I'm in year 11 out of 12 if that helps, your pfp is cool too 😉

[twilit pendant]

thanks haha - lemme search up what year that is because american school system is diff to english 1 sec

[twilit pendant]

so youre a junior right?

[twilit pendant]

https://www.youtube.com/@PhysicsOnline/videos

this may be the totally wrong stuff that you want to look at but he does quite simple but interesting topics and by watching him ive improved my grades by quite a bit

[fiery geyser]

alright thank you, although I should've mentioned that I'm a german student sorry but still I'll check it out

[ashen sparrow]

what even is this book

[twin mist]

E

[sand elm]

how?

[twin mist]

I will explain in a minute

[coarse flicker]

for the first one u should use PV=nRT

and for the second u should use p1v1+p2v2......=psvs

im not so sure abt the last one but if volume increases pressure will decrease so thats probably why its not included in the answer

[twin mist]

PV=nRT den zaten n, R ve T sabit

1. Şık için X gazının PV si 18 geliyor Vsi 3 den 10a çıkıyor bu yüzden çarpım sabit olması için 1.8 oluyor basıncı
   2.Şıkta Xin kısmi basıncı 1.8 Yninki 0.6 Zninki 2 toplam basınç 4.4
2. 2. Kaptaki kaptaki 3ten 4.4 3. Kaptaki 4ten 4.4 oluyor

[twin mist]

Hepsi doğruymuş

[coarse flicker]

çünkü dediğin gibi 4,4 oluyor ama sen b deyince ben de kap havimlerine böldün sandım 😅

*hacim

[twin mist]

Göz gezdiriken yanlış çözmüşüm

[twin mist]

Yok :))

[sand elm]

teşekkürr

[echo plover]

ig it is acceptable!.... as oxygen is more electronegative than sp2 carbon here... so it will stabilize the -ve charge!! correct me if i am wrong!

[echo plover]

as there is no external torque or the external force... ig you can conserver energy!!
[K.E. (ball) + Rotational Energy of bat] initial = [K.E. (ball) + Rotational Energy of bat] final

[stiff minnow]

Thank you 🙏🏿

[ashen sparrow]

"An atom is the smallest unit of matter that contains all of the element's chemical properties"
do you know how to rephrase this?

[past storm]

Is geopolitics considered a science ?

[reef quail]

all the chemical properties of an element are contained in the smallest unit of matter known as atom

[ashen sparrow]

Thank you!!!

[thorny gyro]

Any cbse class 12 (PCB) pass out here?

[echo plover]

not PCB but PCM if that helps!!

[thorny gyro]

oh I wanted to know smth about practical exams

[thorny gyro]

Can you help a bit ...just few questions

[echo plover]

truth is i never gave practical exams😅

so sorry cant help with that...

[thorny gyro]

Oh ok np ...Thanks for replying

[ashen sparrow]

"Atoms of each element contain a characteristic number of protons and electrons."

What does this mean?

"Atoms of each element have a unique amount of protons and electrons that give the atoms its properties"?

[glad smelt]

Each atom has an atomic-number (Z). The atomic number determines how many protons that specified atom has.
E.g.: O - oxygen has atom number 8, and thus has 8 protons, He - Helium has atomic number 1, and thus has 1 proton

If the atom is a neutral atom, that atom number is also the amount of electrons it has

These determine the properties of an atom (how it reacts with other atoms/fyscal world/...)

[ashen sparrow]

Thank you!!! ❤️

[torn oar]

I think an important note here is the fact that the atomic number, ie, number of protons, is completely unique to the element in question. If we talk about Carbon, while the amount of electrons may vary for different Carbon ions and the amount of neutrons may differ with different isotopes, something that does not change is the amount of protons in the atom. If you change the number of protons you are changing the element entirely.

[ashen sparrow]

Thanks!! ❤️

[dim escarp]

guys does anyone here know circuits, something is driving me nuts

[sacred orchid]

anyone got tips on AP physics, I feel like I usually understand the material but perform really eh on the tests

[dim sapphire]

does anyone know what is molecular vibration pls explain it to me thanks

[dim sapphire]

\

[radiant yoke]

Could anyone help me with this please

[grave pendant]

A 60 W bulb will glow more brightly. Since the circuit is in series the same amount of current is drawn by both the bulbs. However power is a quantity which measures how much energy is consumed in one second. So one bulb consumes 60 joules of energy in one second . More energy drawn means the bulb will glow more brightly.

[radiant yoke]

Thank you so much.!!!! What about the energy......my answer camelike 24kwhr

I'm not sure if that's right

[restive valve]

yeah, 24 kWh should be correct

For the previous questions, however, I thought you would have to find their resistances first which would give you a completely different answer

[radiant yoke]

Yes I thought that too

But another interpretation is when they are in series the current is same

Andthe voltage is also given same

So won't they consume same power?

Since power= VI

[restive valve]

when they are in series, they won't have the same voltage across

[radiant yoke]

But it's said

They are getting 220V

Against the supply line of 220V

[radiant yoke]

There rating is 40W , 220 V will that mean they would be able to consume that power?

[restive valve]

That means that when the voltage across it is 220 V, it consumes 40 W

but since they are in series both against 220V supply

[restive valve]

the voltage is "shared"

[radiant yoke]

It's a similar question, it's done like this

If it is the way, then my answer 24 kwhr is wrong

[restive valve]

yes that would be my solution

[restive valve]

no that is correct because it is a completely different question, it says 220 V supply each

[radiant yoke]

Okayyyy thank youuuu

Then 24kwhr is correct?

[restive valve]

yeah

[radiant yoke]

Yayayyy

[restive valve]

and when in series, the brighter lamp will be the one that ends up consuming more power I guess

[radiant yoke]

Yesss

[restive valve]

which will turn out to be the lamp that's rated 40W, 220V if i'm not mistaken

are you given the final answers by any chance?

[radiant yoke]

Not yett

[radiant yoke]

Power = v/r²

So power is inversely prop to resistance

60W has to power so less resistance

Hence it'll glow brighter?

That's my interpretation

[restive valve]

calculate their resistances first and then find their power using R^2 * I, easier that way because they have the same current

just like the picture you sent before

[radiant yoke]

Yes, ig that's how it should be done and not how it is done to get 24kwhr

[restive valve]

like i said before, the final question is worded differently than the first two because it says 220 V supply each, so I think 24kwhr is correct

[radiant yoke]

Okayy thank youuh

[bronze flame]

Hi I have a physics test tomorrow on Uniform Circular Motion and rotational kinematics, my teacher released some info on the test but dont know what he means by "converting to linear quantities"
here:

One 2-part question, straightforward, involving rotational kinematics and converting to linear quantities (8pts)

[spice cipher]

i'm sorry i dont know anything about physics but we have the same pfp lmao!!

[bronze flame]

https://tenor.com/view/clap-gif-25211694

Great pfp!

[radiant yoke]

i have a doubt, In this question they have taken the formula I²R = P so here, power is Directly proportional to R but if we consider the formula P= V²/R Then power is inversely proportional to Resistance. Which will have a completely different explanation of this. I can't get it. If you could help me it would be really helpful thank you.

[restive valve]

You can compare them based on their resistances using I²R because they have the same current running through (in series). In order to use the formula V²/R to compare them based on their resistances they would have to have the same voltage across them (in parallel). So the first formula is useful when they are in series and the other formula when they are in parallel

[radiant yoke]

Ohhhh now I got it thank you so much you're really good

[grave pendant]

What he/she means is write all the equations of motions you would write for non circular motion.

[worn smelt]

how do you do questions like this?

[restive valve]

the voltmeter is dead easy, it's connected to 6V at the positive end and 8V at the negative end, so it shows -2V

now for the ammeter, you may solve the circuit first by negating the effect of one of the Voltage supplies and then by negating the effect of the other Voltage supply

and at the end add the two results together

for the current I mean

[worn smelt]

oh ok great

thanks for the help

[dire shuttle]

Anybody?
Q.44

[woeful talon]

when do we cant apply bernoulli's theorm? or what are the conditions we are assuming to apply bernoulli's?

[teal birch]

the very instant after releasing the system, i think it will be in equilibrium, so try assuming the hinge reaction to up/down based on how u can balance the forces of the system in an fbd
so basically try writing the force and torque equations so that the system is in equilibrium, i think that can help you find the answer

[woven pivot]

guys, can someone solve me this? i have to fill in the blanks but im so confused

[thorny gyro]

what is the general outer electronic configuration of d, f orbitals; my textbooks say one thing and the internet says otherwise ://

[dark sundial]

i’ll send a chart to help with electronic configuration

d orbitals go up to 10 and f goes up to 14

for elements in the 6th and 7th periods the f configuration comes before the d configuration

[surreal pagoda]

i need some help with this. i don't know how to simplify the equation in order to solve for T1 which has a final answer of 4.0 N. appreciate any help.

[harsh oak]

You first have to solve the sinus and cosinus. First, you calculate sin(60)* cos(30)/cos(60), thats 1.5. Then the equation is T1*sin(60) + 1.5(from step 1)T1=8N. You know that sin(60)=0.5, so the equation is 2T1=8N. So T1=4N

Btw sry if my english is bad, im from switzerland

[surreal pagoda]

yooow thank you

[vague tinsel]

does anyone know how to solve this?

[spice cipher]

start of by writing an equation for the reaction of HCl and NaOH
then calculate the moles of NaOH
you can use then calculate the moles of HCl by comparing the molar ratios of HCl and NaOH
then calculate molarity!

[dim stirrup]

Don't understand this at all. I get the density equation but I can't seem to figure out the algebra behind the conversion

[harsh oak]

First you gotta get from yd^3 to yd, so you calculate the 3rd root of 75, which is about 4.217. Then you multiply that by 1.094 to get to meters. Then you multiply that by 100 to get cm. You get about 461.357cm. Then you potentiate that with 3 to get cm^3, so you get 9.82 x 10^7 cm^3. You know that 1cm^3 is 1g, so you get 9.82 x 10^7 g.

[timber tusk]

can anyone help me with year 10 chemistry?

[cunning crescent]

Just post your question here

[umbral girder]

can someone please show me how to do this conversion (step by step using the whole table thing)
Convert 45 kg cm / hr^2 to Newtons

[thorny gyro]

Two cells of emf 4V and 2V having respective internal resistance of 1 Ω and 2 Ω are
connected in parallel, so as to send current in the same direction through an external
resistance of 5 Ω. Find the current through the external resistance.

[woven pivot]

Thank you! That actually didn’t come up on my exam so I got to look at it with a more relaxed mind 😤 but thank you so much for the help!

[zealous spear]

Hi, I am currently learning basic chemistry (and once mastered, will lean towards organic chemistry).
I am looking for great lectures/ books/ other resources, anything would be greatly appreciated !
Thanks

[buoyant void]

You can try ""organic chemistry tutor"" yt channel

[zealous spear]

Thank you ^^
I'll look it up

[floral drift]

brain not braining

[thorny gyro]

hey guys so we’re asked to calculate the frequency but we weren’t really told much about the oscilloscope and i’m confused. any help appreciated

[zealous spear]

the formula for frequency is f=1/t (with f for Frequency and t for Time)

The knobs right above the port (circled in blue) are used to change the time (in ms) / voltage (in V) scale.
What you've got there is a sine function (in red), signal often repeat, which in your case does.
The interval (yellow line) is your t, which you will divide 1 by, resulting in f, your researched frequency

Do ask your teacher about Markers, they will become essential as they can precisely measure an interval, be it of time or of voltage.

[zealous spear]

like so

also sorry for answering so late

[thorny gyro]

thank you so much! that is so helpful

[zealous spear]

np

[copper forge]

does anyone know whether the efficiency of an absorption column increases with increasing flow rate of the absorbent?

[worn smelt]

hey guys for this problem the solution is

but i dont understand change in kinetic energy is only the highlighted part

because should it be a kinetic energy - a kinetic energy

instead of just - kinetic energy

[restive valve]

yeah it should be final KE - initial KE but the final is 0

[worn smelt]

but in this case didnt they do the opposite

[worn smelt]

because for some reason the kinetic energy is negative

[restive valve]

no, it's 0 minus the initial, that's why it's negative

[worn smelt]

but the kinetic energy thats highlighted is for the final

because it has both the masses

or am i confused lol idek anymore

[restive valve]

oh, by final in this step I mean the final KE when the block stops

and by initial I meant the KE of the block with the bullet inside right after collision

[worn smelt]

ohh shit yeah idk why i was mixing up 2 scenarios haha

thanks i got it now

[restive valve]

no problem

[crystal hare]

Hello I am struggling with the following question in experimental physics: if every being living on earth were to travel to the equator, which consequences would there be for the duration of a day?

[snow meadow]

the earth would take longer to rotate because rotational inertia increased

aka days would be longer

[crystal hare]

Thanks :)

[snow meadow]

lmk if u need anything cuz im taking physics for engineers

[rocky folio]

Hi, does anyone here use Anki method for psych? And would you recommend it?

[olive kelp]

Hey, can someone help me with figuring the balanced equation for the reaction between sodium chloride and mandelic acid

[sinful mirage]

Chapter oscillations
Topic : analysis of phase where the object at t=0 at different positions from mean position such as A/2 ,(√3/2)A etc. and we calculate the phase and using that find velocity and displacement .
I dont understand why the teacher calculated the valueof "velocity" by putting t=0 and phase value in general expression of velocity , but in case of displacement only the phase value is put in general expression and expression is derived. Is it because we already know its value through the diagram its given like A/2 etc. ?
Why we did not put t=0 in general expression of displacement too ???????

If its too long read the last line only , its the question in short

[cyan cargo]

You are not finding displacement here I think

You are finding the general expression of a simple harmonic motion

and for that you need t in the expression

to find the displacement at any time 't'

[cyan cargo]

You are already given the displacement at t=0

which is A/2

using which you found the phase angle of the shm

[sinful mirage]

So we are finding the velocity value and shm equation

[cyan cargo]

Yes, using the initial displacement given

[sinful mirage]

Thanks

[sinful mirage]

Which one is correct ? with locant name we use bis instead of di , so with common name too we use bis Or we use di?????

PCC= PARENT CARBON CHAIN
NOW , in 5th why we chose C-CH3 AS CHAIN not CH3-C-CH3 ?
IS it because locant names are fixed , so it will only be 1',1'-dimethyethyl

[sinful mirage]

How do I draw these angles in the phasor diagram such as π/4 , π/6 i mean which side i always end up marking them other side like π/4 is near π/3 but i drew that other side how do i know which side to draw the angle

If anyone knows pls answer

[marble geyser]

These are alkyl groups, not the main principal groups

its already connected to a bigger chain

[sinful mirage]

Ehhh.. but above they are still considered above in making pcc in complex substituent

[cyan cargo]

see this for example

[cyan cargo]

if you take CH3 -- C -- CH3 chain in the alkyl group, you'll end up with 3 carbons

while if you take CH3-C, it'll form a bigger chain with 6 carbons along with pcc

[sinful mirage]

I can only see 2 carbon ,the C is already included in big purple chain

[cyan cargo]

those two are different scenarios....

[sinful mirage]

I see well . I will work on my basics then

[sinful mirage]

Thanks for your time

[cyan cargo]

do you know the rule for selecting the main chain?

[sinful mirage]

Yes

[cyan cargo]

then you just ignore these, you can name the chain by selecting the main according to the priorities

[sinful mirage]

Max carbon -----> if same no. Carbon chain formed in more ways then the one with more substituents

[cyan cargo]

yes correct!

[woeful talon]

why did we equate force due to surface tension = weight of liquid column?

[alpine hedge]

iiiii dont know whats going on here

i got 55m as an answwer but it says its -91

[vagrant widget]

The energy used in a 100 kilometres car trip is about 15 kWh. Assuming that the energy content of the fuel is 10 kWh/litre and the efficiency of the engine is 33 %, how many litres of fuel are needed for a 100 kilometres car trip? Choose the best alternative.
Help me

[barren cliff]

Can Anyone help me how can i solve these types of questions

[native parrot]

i need help!

[thorny gyro]

How much energy does it take from a detonator (blasting cap) to detonate C4

google won't tell me anything

this is for educational purposes

(strictly)

using a pyrotechnic fuse

[topaz garden]

Bear with my stupidity here but

How does O2 turn into O5? 😭

I thought both sides were supposed to be equal or something

[zealous spear]

yep, that makes a lot more sense now, thanks !

[waxen cosmos]

what is this answer rounded to correct sig figs?

30.61?

[crimson pivot]

Can someone check my answers so far?

[sinful mirage]

My teacher wrote -5-ethyl after -3-cyclopropyl , saying lowest locant rule will work here as it gives 1,3,5 but if we write ethyl before cyclopropyl it gives 1,5,3 ...... and locant rule will have priority over alphabetical order
How tf there is locant rule there when NAMING it

[woeful talon]

organic chem doubt!
why in the case of halogens attached to beneze ring, it shows -I inductive effect more than resonance?

[languid summit]

the numbers should just be as small as possible

[spiral valley]

guys

I need help

is it possible to solve phy problems without memorizing fourmulas

[languid summit]

what chapter/topic

[valid ice]

When was the most inappropriate time you busted out in laughter?

[languid summit]

sry

[pale girder]

Why benzene given different priorities here?

Bro just reacted 😭

[languid summit]

😳 i always thought they were the same thing

[pale girder]

😭😭 now you know

[languid summit]

😭 chem sux

[zealous spear]

I was studying chem a few weeks ago but haven't gotten to this point yet, so I simply curious what the answer is.
Sorry that I can't help

[cyan cargo]

can you explain what do you mean by given different priorities here?

[reef charm]

Second one is C6Cl6 Hexachlorobenzene https://en.wikipedia.org/wiki/Hexachlorobenzene
First one, idk. Weird that it doesn't have resonance, and that you wrote "benzene", so I'd say, double check.

Ohhh, could be this https://en.wikipedia.org/wiki/Lindane

First time I see this

C6H6Cl6

Lindane is the gamma isomer of hexachlorocyclohexane ("γ-HCH").

is an organochlorine chemical and an isomer of hexachlorocyclohexane that has been used both as an agricultural insecticide and as a pharmaceutical treatment for lice and scabies.
Lindane is a neurotoxin that interferes with GABA neurotransmitter function by interacting with the GABAA receptor-chloride channel complex at the picrotoxin binding site. In humans, lindane affects the nervous system, liver, and kidneys, and may well be a carcinogen.[5][6] Whether lindane is an endocrine disruptor is unclear.[7][8][9]

So it's the gamma isomer of https://en.wikipedia.org/wiki/Hexachlorocyclohexane 🧐

is any of several polyhalogenated organic compounds consisting of a six-carbon ring with one chlorine and one hydrogen attached to each carbon. This structure has nine stereoisomers (eight diastereomers, one of which has two enantiomers), which differ by the stereochemistry of the individual chlorine substituents on the cyclohexane. It is sometimes erroneously called "benzene hexachloride" (BHC). They have been used as models for analyzing the effects of different geometric positions of the large atoms with dipolar bonds on the stability of the cyclohexane conformation.[1] The isomers are poisonous, pesticidal, and persistent organic pollutants, to varying degrees.

Huh

[reef charm]

It's a lil' confusing because from what I know, benzene substitutes hydrogen with different molecules like chloride, and there's resonance for Hexachlorobenzene, so I know what that is. Don't know what exactly the other one is, because it has the hydrogen atoms and doesn't have resonance. Seems to just be a cyclohexane with chlorine substituents 1,2,3,4,5,6-hexachlorocyclohexane

The second one is 1,2,3,4,5,6-hexachlorobenzene

[reef charm]

Apparently, this used to be called "benzene hexachloride" because historically you could get it from benzene.

So there you go

I hope my explanation wasn't confusing. I was learning while trying to explain 🤣

[pale girder]

Thank you so much i loved your explaination nd the sources too

[pale girder]

Naming of compounds in organic chem is based on their priorities so i suspected why is it so that benzene is given priority to be Frist in first structure nd last in second

[visual minnow]

SOS

[reef charm]

np mate!

[sinful mirage]

The prostrate gland does the secretion too?

But it alone does not secrete the seminal fluid

Is it the reson 3rd is the only correct one

[wraith heart]

does anyone know the best way to understand reaction mechanisms and their conditions? I'm in college ochem studying about sn1, sn2, e1, e2, and some additional variations that may occur.

I'm struggling to understand the concepts

[fair hearth]

(Physics) Does light always reflect when it hits the boundary between two different mediums?

[reef charm]

A video that helped me
https://www.youtube.com/watch?v=hz-fSXifP9w

I go for this channel whenever I'm struggling with Organic Chemistry

[wraith heart]

i used to really like ochem tutor as well

but a lot of his videos were shortened

and to watc hthe full one you need patreon dono

but thank you for the reccomendation!

[reef charm]

yeh that does suck xP

But honestly, I don't know where else to look for

There is professor Dave https://www.youtube.com/watch?v=IOViLLuDMTs

And the Crash Course ochem series
https://www.youtube.com/watch?v=2SWVieovfsQ

Although ochem has shortened his videos, some are still full length, and he often makes multiple vids about the same topic

Besides these 3, I check wikipedia 🤣

[reef charm]

I looked it up, and I think deferens transfers sperm, but the fluid part is produced by the prostate gland if I'm understanding this correctly .w.
What is the question?

Also, the more you know

https://tenor.com/view/the-more-you-know-gif-26317296

[reef charm]

@wraith heart sorry for pinging you again
https://chem.libretexts.org/Courses/Purdue/Purdue_Chem_26100%3A_Organic_Chemistry_I_(Wenthold)/Chapter_06%3A_Alkyl_Halides.__Nucleophilic_Substitution_and_Elimination/6.13_Summary%3A_Determining_SN2%2C_SN1%2C_E2_or_E1/Summary%3A_Determining_SN2%2C_SN¬1%2C_E2_or_E1

This site contains completely free and open information about chemistry in general
Scroll below for some additional resources on the matter
Hope it helps ^^

This whole chapter explains and compares them https://chem.libretexts.org/Courses/Purdue/Purdue_Chem_26100%3A_Organic_Chemistry_I_(Wenthold)/Chapter_06%3A_Alkyl_Halides.__Nucleophilic_Substitution_and_Elimination

I should study em' again

[cunning crescent]

Khan Academy is also a good learning resource, you can see if they've got anything on o-chem

[wraith heart]

Don’t be sorry for ping me! I really appreciate the links thank you!

[reef charm]

np 💖

[granite sierra]

s

[wind musk]

doesnt always

[fair hearth]

Yeaahh like sometimes it absorbs the light

[wind musk]

Quantum physics is hard af

[wind musk]

refracted

[fair hearth]

Yeah 😭

[stoic flame]

I umderstand if u cant read the handwriting and i am truly sorry but i was in a rush and i really needed help so if anyone can pls do help

[left maple]

Do any of you have any notes on electromagnetism that you would like to share? 🙏

[potent bobcat]

How the hell do I do this guys ????

[eager heron]

which grade

[languid summit]

for radius, use the formula -> r=mv/qb
and for pitch you can just do -> distance=speed*time
where speed would be the velocity in the x direction

[cedar slate]

any french speaker who can understand a physics problem and help me with it please?

[zealous spear]

I'm french

[cedar slate]

could you help me please?

[zealous spear]

sure let's try

[cedar slate]

it’s the 10

the picture is uploading

[zealous spear]

I'm sorry this is way too advanced for me

[cedar slate]

it’s okay thank you for trying ♥️

[zealous spear]

but I can translate it in english so someone else might be able to, if you want

[cedar slate]

i’ll try to do that myself

thanks

[zealous spear]

alright
feel free to DM if you have any doubts

[olive warren]

how would i calculate the current flowing through each resistor?

[warm gull]

is the 12 V for both of the batteries or its 24 in total

if its 12 in total for both

flow is divided between em based on how much R we got, the smaller R gets more flow ( bigR/smallR of the flow) n the bigger R gets the rest

for exp

hope it helps

[olive warren]

thanks

[olive warren]

sorry, was having lunch. its 12v for both

[warm gull]

no problem! bon appétit

[hushed saddle]

this image.light hit the CC mirror. If the mirror moves to the left with a velocity v m/s, then the change in distance AB in seconds is?

[hushed saddle]

help..

[cyan cargo]

is the answer 2v/sec? because velocity of image is twice the velocity of mirror in same orientation

[wispy musk]

hi anyone can give me help ?

[warm gull]

what help

[steady gale]

Hello, I have a physics question relating to the coefficient of friction. Does the mass of an object affect the coefficient of friction? The equation µ = Ff/Fn (µ equalling the coefficient of friction, Ff equalling the force of friction and Fn equalling the normal force), suggests the force of friction and the normal force determine the coefficient of friction. Though, if you look deeper into the normal force; if the object is at rest vertically, the net force must equal zero right? In that case, the normal force and the force of gravity equal (Fn = Fg), to calculate Fg, we can use the equation Fg = mg (m equalling mass, and g equalling gravity, 9.8). So, I'm assuming with that logic, we can say Fn = mg. Therefore, mass affects the normal force, which also affects the coefficient of friction. So I concluded that mass has an effect on the coefficient of friction. But just to make sure, I Googled my question, and apparently, according to a couple of websites, mass does not affect the coefficient of friction. So, now I am even more confused than before. If anyone knows, please, does the mass of an object affect the coefficient of friction? And if you know why? That would be a great help too.

[signal stump]

No, coefficient of friction isn't dependent of mass of object and is constant for a pair of objects

[signal stump]

Take an example, speed of light is f*wavelength. Right?

So it depends on both factors? Not really. The value is constant for a medium and other two change accordingly

Same goes for resistance and capacitance. It's constant and other values adjust accordingly

[hushed saddle]

if it is changed to TAN 60 DEGREE, it means ab/ao=√3. means ab=ao=?

What is the next?

√3?

[white fern]

is this the correct answer?

v√3

[hushed saddle]

ty

I'm suck at physics

[ebon canopy]

c

[topaz pasture]

Materials:

A sandwich-sized ziplock bag
A snack-sized ziplock bag
10 mL vinegar
10 mL baking soda solution (made by mixing 1 tablespoon of baking soda with water until it dissolves)
1 tablespoon calcium chloride
1 tablespoon citric acid
Water
Paper clips
Rubber bands
Straws
Tape
Thermometer

Instructions:

Mix the citric acid and calcium chloride in the snack-sized ziplock bag and seal it. This will be the inner bag that holds the reactive ingredients.
In the sandwich-sized ziplock bag, mix 10 mL of vinegar and 10 mL of baking soda solution. This will be the outer bag that activates the inner bag.
Fill the outer bag with water, leaving some space for the inner bag to fit in.
Insert the inner bag into the outer bag, making sure the two bags don't mix yet.
Use a straw to suck out the air from the outer bag and seal it.
Tape the thermometer to the outside of the outer bag, making sure it's in contact with the water.
Use a paper clip to puncture the inner bag, releasing its contents into the water in the outer bag. Quickly seal the outer bag and shake it to mix the contents.
Use rubber bands to secure the cold pack to the affected area.
Explanation:
The chemical reaction between the citric acid and calcium chloride in the inner bag is highly exothermic, releasing a large amount of heat when mixed. When the inner bag is punctured and its contents are mixed with the water in the outer bag, the reaction causes the water to rapidly cool down, resulting in a temperature decrease of at least 10 degrees Celsius in 5 minutes. The Law of Conservation of Mass states that the total mass of the reactants before a chemical reaction is equal to the total mass of the products after the reaction. In this case, the mass of the reactants (citric acid and calcium chloride) in the inner bag is equal to the mass of the products (heat energy) released by the exothermic reaction. The outer bag containing water and the reactive ingredients is portable and can be activated when needed by puncturing the inner bag with a paper clip.

[fluid socket]

damn

[signal stump]

Who else but PW 😂

[ashen sparrow]

Does anyone know any good online courses to do with beginning bioloy? Preferably not one that i have to have qualifications for

also, any interactive websites or apps i can use to help learn it?

[ebon canopy]

I LOVE U SO MUCH TYSM

[ebon canopy]

khan academy

[thorny gyro]

alakh?

[topaz pasture]

HELLOOO BACHOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO...

[thorny gyro]

OMG ALAKH SIR, PLEASE GIVE ME SPACE IN KOTA

[topaz pasture]

Don't worry bacha, Kota keeps getting empty anyways

[solemn cave]

ong HAHHAHAH 💀💀💀

[potent bobcat]

Help please

[fringe siren]

Cbse 12th boards 😭??

I know this one will solve and send this in 10

[hexed pollen]

Ka = 1.76 x 10^-5

Can someone please help me solve these two questions? Thank you

[olive warren]

Can anyone explain number D, the solution given here is confusing

[viral sorrel]

use archimedes' law to determine the density of your gold bar and compare it with gold density

[olive warren]

Alright

How would i solve, C

[viral sorrel]

distance=vp* t+vq* t

find t

[olive warren]

I feel dumb 💀

Thanks

[viral sorrel]

dw

[olive warren]

Can anyone explain the intution behind solving D

[viral sorrel]

distance=vullet* t -1/2a *t^2
you find a with f=ma

[olive warren]

Whats the value of F?

[viral sorrel]

given by the problem

[olive warren]

Isnt that friction, How thats related to the velocity of the bullet?

[viral sorrel]

you're being given the force the sand exerts on the bullet

[solemn jay]

anyone knows iupac naming

[fringe siren]

Yes ik have my Chem exam in like 4 days

[solemn jay]

i posted it on general help chat few min ago

rourou answered it and i think its correct can you confirm

[steel basalt]

A tank contains 300g of nitrogen gas at a temperature of 30c and a pressure of 5atm, then what would be the volume of the nitrogen gas then?
Correct solution: 0.0523m^3

seems like i messed up at my answer as its not matching

[viral sorrel]

find the molar mass of nitrogen, then find the number of moles, after that you just have to apply pV=nRT after converting the temperature from celsius to kelvin

[steel basalt]

I did that yes but my answer was not matching 💀

maybe the ans is wrong there then

[viral sorrel]

what's your answer and what's the book answer?

[steel basalt]

Mine answer was 0.05226 approximately

And the book ans was something with 1200 i guess, can’t remember

I did something wrong ig

[odd ibex]

quick, sir gonna give 100 to the one who solves

QUCK

quick

Just gotta explain it

QUICK

Gotta explain

not answer

quick

explain

explain every step

not google

[viral sorrel]

seems wrong

i got something like 1,09 m^3

[steel basalt]

What u counted W as

n = w/m

[odd ibex]

he said we can do whatever we want, we have to explain it

9 seconds