CHEMISTRY COMMUNITY

Karen Zheng_2K

For this class, they will usually tell you in the question itself.

Karen Zheng_2K

When in doubt, check MyUCLA, but if it's still not on there, email your TA!

Karen Zheng_2K

It can only change through temperature!

Karen Zheng_2K

The first order reaction has a rate proportional to the [reactants], the second order reaction has a rate proportional to [reactants]^2.

Karen Zheng_2K

3/14, 9:30 am - 11:00 am PST which gives us about an hour and a half.

Karen Zheng_2K

For this class, I do handwritten notes on Goodnotes just because there's a lot of stuff that is easier explained in diagrams and drawings.

Karen Zheng_2K

Honestly for me taking small breaks between and doing a hobby on an off day helps a lot, especially with online classes :///

Karen Zheng_2K

Sometimes you leave a space in the equation without knowing or are missing something small like a parentheses!

Karen Zheng_2K

We would use H+ and OH- accordingly, but not H2O!

Karen Zheng_2K

Highly recommend Gushi, Bibibop if it's still there, and Sharetea!

Karen Zheng_2K

If any of you guys like kdramas the Uncanny Encounter on Netflix is really good

Karen Zheng_2K

Knowing common ones will be useful for the MCAT and other similar tests, but for this class I think they're mostly given to you.

Karen Zheng_2K

The Night Circus by Erin Morgenstern!

Karen Zheng_2K

The problem will usually tell you what each one is but water is usually l and you can assume most metals will be s.

Karen Zheng_2K

Just switch the cathode and the anode!

Karen Zheng_2K

I think this is fine? As long as you clarify which class you're in.

Karen Zheng_2K

From what I've seen, I'm planning on going to as many Step-Up sessions as possible as well as redoing all the textbook problems.

Karen Zheng_2K

Last time it was about a week, maybe earlier.

Karen Zheng_2K

Units help in determining which R value to use!

Karen Zheng_2K

Highly recommend going to office hours and Step-Up sessions, or even the youtube videos the GroupMe recommends!

Karen Zheng_2K

Thank you for sharing this, it gives me new motivation for the upcoming midterm!!

Karen Zheng_2K

q can only be equal to -w, and only when delta U is at 0.

Karen Zheng_2K

The little degree symbol just stands for G at standard condition.

Karen Zheng_2K

Lavelle only teaches gen chem!!

Karen Zheng_2K

I think you'll be fine, sometimes they open up more spaces due to demand right before week 1 of the quarter, so check back then!

Karen Zheng_2K

You can use the PV=nRT and then the work function equation to solve for this.

Karen Zheng_2K

I heard some people saying it should be out of 20 but mine was out of 25.

Karen Zheng_2K

I agree with the textbook problems!

Karen Zheng_2K

Endo = (+)delta H, and Exo = (-)delta H

Karen Zheng_2K

I've really only seen adiabatic but none of the other ones (yet).

Karen Zheng_2K

Change in temp is just represented by delta T, and you can use the equation q = mc delta T to solve this problem!

Karen Zheng_2K

Your image doesn't work but you can use PV=nrt to solve it I'm guessing?

Karen Zheng_2K

Only temperature! I got confused too, but V and P don't affect it at all.

Karen Zheng_2K

Kaleb Tuliau 3E wrote:Does 14C have a lab as well?

There's a 14CL but you may not have to take it depending on your major. Med and dental schools do require it though, and people usually take this during 14D or after 14C/D.

Karen Zheng_2K

I assume with all the different versions and partial credit calculations, probably this coming Friday or weekend?

Karen Zheng_2K

I usually keep the full number in my calculator until the very last step, so if you haven't tried that you can do that and see if it works!

Karen Zheng_2K

Setting up an ICE table and then using the Ka equations to solve for this would be the way to go.

Karen Zheng_2K

We are allowed to have the equation sheet and the periodic table out for the midterm!

Karen Zheng_2K

For salts, they usually have a spectator ion like Na+,or K+, and an anion which is the conjugate base of the acid. As for why non-neutral salts combine with water, it's usually because the negative atom (i.e. Na in NaCl) is attracted to the negative atom (O-).

Karen Zheng_2K

I feel like all of the UA sessions are doing general midterm topic review if that's what you're looking for? I've been to the ones over the weekend and they did a lot of ICE table problems.

Karen Zheng_2K

Chase Atlantic and blackbear are good for studying!

Karen Zheng_2K

Inverse of Kc would just be used for the reverse reaction, so products --> reactants!

Karen Zheng_2K

I feel like reading the textbook will help reinforce the mechanisms and explanations he does in lecture, but the extra discussion sections and actual textbook problems will help with actually working through problems/concepts.

Karen Zheng_2K

From Andrew's discussion section he said that we can use either bars or atm, but if something is in Pascals, you would need to convert it back to atm usually!

Karen Zheng_2K

It's simply just due to the fact that there is a bigger difference between 1000 and .001, and it would be easier to tell apart whether the reactants or products are in a higher concentration than say, 0.9 vs 1.1.

Karen Zheng_2K

I got the same problem with one of the Sapling problems for this week, I just kind of looked at which number seemed the most feasible and also just plugged it back into the quadratic equation to double check!

Karen Zheng_2K

If you still need help on this, would you be able to post your initial values?

Karen Zheng_2K

^ I got the same answer, 1st and 3rd reactions!

Karen Zheng_2K

This is due to the fact that when Q is less than K there are more reactants present which would automatically make the forward reaction (--->) more favorable!

Karen Zheng_2K

K is only used when a system is in equilibrium (K=Q)!

Karen Zheng_2K

All you would need to do is use the "Quick links" at the top left corner and go to "New posts" in order to find the most recent posts. There is a big "Post reply" button once you click into these posts that you can use to reply and answer questions. Hope this helps a li...

Karen Zheng_2K

In this case it would shift left since total pressure would favor the side with less moles!

Karen Zheng_2K

In comparison to total pressure, partial pressure is just the measured pressure of one gas if it were in a container by itself, as compared to it being in a mixture with other gases.

Karen Zheng_2K

When you reverse an action, K becomes 1/K!

Karen Zheng_2K

Thank you so much for sharing your story! As someone who will be applying to professional schools soon this is a great source of inspiration, and reminds me that I don't need to focus on the tiny things in order to get to where I want. :)

Karen Zheng_2K

What element is a girl's future best friend?
Carbon.

Karen Zheng_2K

What is the name of 007's Eskimo cousin?
Polar bond.

Karen Zheng_2K

What do you do with a dead chemist?
Barium.

Karen Zheng_2K

When one physicist asks another, "What's new?" what's the typical response?
C over lambda.

Karen Zheng_2K

Titanium is a most amorous metal. When it gets hot, it'll combine with anything.

Karen Zheng_2K

Why does hamburger yield lower energy than steak?
Because it's in the ground state.

Karen Zheng_2K

Why do chemists enjoy working with ammonia?
Because it's pretty basic stuff.

Karen Zheng_2K

What did the bartender say when oxygen, hydrogen, sulfur, sodium, and phosphorous walked into his bar?
OH SNaP!

Karen Zheng_2K

What do chemists call a benzene ring with iron atoms replacing the carbon atoms?
A ferrous wheel.

Karen Zheng_2K

The optimist sees the glass half full.
The pessimist sees the glass half empty.
The chemist see the glass completely full, half in the liquid state and half in the vapor state.

Karen Zheng_2K

Making bad chemistry jokes because all the good ones Argon

Karen Zheng_2K

Silver walks up to Gold in a bar and says, "AU, get outta here!"

Karen Zheng_2K

Anyone know any jokes about sodium?
Na.

Karen Zheng_2K

If the Silver Surfer and Iron Man team up, they’d be alloys.

Karen Zheng_2K

What do you do with a sick chemist?
If you can't helium, and you can't curium, then you might as well barium.

Karen Zheng_2K

What is the chemical formula for "banana"?
BaNa2

Karen Zheng_2K

Karen Zheng_2K

rip vday

Karen Zheng_2K

Karen Zheng_2K

Karen Zheng_2K

Karen Zheng_2K

Karen Zheng_2K

when you spill water all over your laptop :(

Karen Zheng_2K

Karen Zheng_2K

Karen Zheng_2K

Karen Zheng_2K

Karen Zheng_2K

Karen Zheng_2K

Karen Zheng_2K

hopefully not this quarter

Karen Zheng_2K

Karen Zheng_2K

Karen Zheng_2K

What kind of dog do chemists have?

A laboratory retriever.

Karen Zheng_2K

Karen Zheng_2K

Why did the polar bear dissolve in water?

Because it was polar.

Karen Zheng_2K

What kind of dogs do chemists have?

Laboratory retrievers

Karen Zheng_2K

Thank you for clearing that up, it helped me a lot.

Karen Zheng_2K

Thank you for clearing that up, I wasn't sure what I needed to study.

Karen Zheng_2K

These methods really helped, thank you!!

Karen Zheng_2K

This really helped me, thank you!!

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