CHEMISTRY COMMUNITY

Katie Phan 1K

Going through a Beach Boys phase right now!!

Katie Phan 1K

Thank You Dr. Lavelle!
You will forever be ingrained in my freshman year memories! Keep vibing out.

Katie Phan 1K

I think Lavelle teaches some upper-division chem classes.

Katie Phan 1K

I would change the units to mol/L

Katie Phan 1K

Gilmore Girls is my guilty pleasure.. It's on Netflix and there's a revival!

Katie Phan 1K

I think it is likely!

Katie Phan 1K

I am simply choosing to ignore it LOL. The pre-equilibrium method is easier and gets the same result. Also, Lavelle said himself that he's not going to go over steady-state approximation.

Katie Phan 1K

These terms are used interchangeably I believe.

Katie Phan 1K

If Q < K, the reaction will shift to the right (towards products).. If Q > K, the reaction will shift to the left (towards reactants). If they are equal, the reaction is at equilibrium.

Katie Phan 1K

For sure there will be review sessions. As for a study guide, it's basically the outlines!

Katie Phan 1K

So sad I missed it! I love karaoke ;(

Katie Phan 1K

Chem 14BL, Chem 14C, & a GE!

Katie Phan 1K

Makes sense that it would be the same. No reason to switch it up now.

Katie Phan 1K

The amount of time you spend studying a topic should correlate with how much time we spent on it in class since that's how the distribution of questions will be like on the final. Don't waste your energy!

Katie Phan 1K

Lavelle will be there? FUN!!!

Katie Phan 1K

2/28 at midnight !!

Katie Phan 1K

This question is always asked! I think Julianna is correct though.

Katie Phan 1K

I totally forgot that for 14A it was cumulative. I was so hyped that finals would only cover the rest of the outlines but I guess not.

Katie Phan 1K

An increase in T increases K.

Katie Phan 1K

Yes, assume it's at 25 C or 298K

Katie Phan 1K

I recommend going back to the lecture where Lavelle distinguished between the two! For an irreversible pathway, work is done against a constant external pressure, and the temperature changes along the pathway. For a reversible pathway, T is constant and V & P are changing.

Katie Phan 1K

Lavelle only teaches general chemistry I believe. Feels a little bittersweet. Gonna miss his music before lectures.

Katie Phan 1K

The textbook is super useful! I usually study based on the textbook and then look at notes from lectures.

Katie Phan 1K

As someone who loves to bake and cook, it's super interesting to see the relations it has to chemistry and how chem has been able to explain a lot of stuff. One thing that I always remember now is the question/topic/idea we covered (don't remember exactly at this point) about why steam is so much h...

Katie Phan 1K

Lavelle sent out an email about midterm 2 details. I believe it's part of outline 3 and outline 4.

Katie Phan 1K

Yeah, it's not updated continuously. Just make sure you have the correct number of posts by the end of the quarter or Lavelle may email about when he's going to input them (like on the day midterm grades are out).

Katie Phan 1K

If delta H is positive, entropy is increasing b/c heat is going into the system. The opposite is true, if delta H is negative, entropy is decreasing b/c heat is leaving the system.

Katie Phan 1K

Ask your TA!

Katie Phan 1K

I'm debating on taking BL and C next quarter or just doing C during spring and BL during the summer.

Katie Phan 1K

I don't think you need to stress that much over it (at least for tests) since it's on the formula sheet Lavelle provides.

Katie Phan 1K

What kind of bear dissolves in water? ...
Polar Bear!

Katie Phan 1K

Curious as to what other classes you guys are taking along with 14BL ?

Katie Phan 1K

Wow, midterm 2 is already coming. How crazy.

Katie Phan 1K

Yeah, just draw out the lewis structure.

Katie Phan 1K

Ask your TA!

Katie Phan 1K

I prefer just plugging the value I got for x / initial concentration and see if it's above 5%. If it is, the value of x is not negligible and you have to solve the quadratic equation likely. If it's under 5% you're good.

Katie Phan 1K

I work 20-30 hours a week. It definitely gets overwhelming at times but I really dedicate my working days to working and then after I'm exhausted from work, I'll catch up on all my lectures/notes. On the days that I am off, I try to get as much done as possible and really maximize my time. The downs...

Katie Phan 1K

I'm sure it'll be released within the week...

Katie Phan 1K

To me, it felt like the difficulty of the midterm 2 for 14A. I think this midterm was definitely harder than the first one we had for 14A.

Katie Phan 1K

Does anyone know what it means when there is partial credit for the midterms? Like how do we get partial credit when it's a multiple choice question with only one final answer? I think if you chose an answer choice that was derived from doing the problem correctly but messing up in the final stages...

Katie Phan 1K

2nd protonation is usually much smaller than 1st anyway.

Katie Phan 1K

Yes and I think we have that formula/constant sheet too!

Katie Phan 1K

I like reading the textbook and looking at the problems.

Katie Phan 1K

Katie Phan 1K

Just the coefficients!

Katie Phan 1K

Check this class's groupme! I know a lot of people post links to shared folders full of UA worksheets.

Katie Phan 1K

It'd probably be best to memorize the strong acids/bases as there aren't that many.

Katie Phan 1K

Either is fine, I think. I prefer graphing for obvious reasons.

Katie Phan 1K

Kelvin

Katie Phan 1K

... is this why they said to drink bleach?

Katie Phan 1K

M is molarity. Moles will be referred to as mol or moles.

Katie Phan 1K

I wonder what the logistics of having midterms/tests during scheduled lecture times will be like.

Katie Phan 1K

If you really loathe the major you're in right now, switch to something that you enjoy! I don't think the process is too difficult unless you're switching into a whole other school/college.

Katie Phan 1K

Sapling is required! In the past, I believe it wasn't, but now it is. You buy the bundle that Lavelle has up on the site, it's around $70ish dollars I believe for multiterm access. It gives you access to the ebook and other resources. Sapling is also where you do the homework which I believe is wort...

Katie Phan 1K

Don't psych yourself out! Study as best as you can and whatever happens, happens! If you've done all that you can do then just have confidence in the fact that you actively prepared yourself for the test.

Katie Phan 1K

I'm sure some questions will be formatted like the textbook questions but not all of them.

Katie Phan 1K

I don't think we need to know this.

Katie Phan 1K

It'll be cumulative based on how much time we spent on each topic in lectures.

Katie Phan 1K

The "SO I BRought NO CLean CLOthes" thing is genius. I typically just memorized them all.

Katie Phan 1K

Hey everyone, I was wondering if anyone on here could tutor me on molarity, i cant seem to undestand it all the way through. If you can tutor me please reply and ill frind a way to conatact you. Watch the videos that Lavelle has up on his website! And do the audio-visual units about molarity/diluti...

Katie Phan 1K

I think Lavelle said something about finishing up the syllabus? So maybe he'll put grade breakdowns on that.

Katie Phan 1K

What everyone else said about the staircase! Divide up the periodic table into blocks and you'll get it in no time.

Katie Phan 1K

I honestly think we'll still be having lectures week 10.

Katie Phan 1K

choose your fighter https://scontent-sea1-1.xx.fbcdn.net/v/t1.0-9/88064312_2557157307726045_2653155032798593024_n.jpg?_nc_cat=106&ccb=2&_nc_sid=8bfeb9&_nc_ohc=4QXy_lLPnE0AX97wGTR&_nc_ht=scontent-sea1-1.xx&oh=2e9589e2bd801080c24a95d67a9a8445&oe=5FF0E396

Katie Phan 1K

What others have said about triangular/cyclic shape is correct.

Katie Phan 1K

Honestly, any graphing calculator will do. Scientific is fine and all but graphic calculators are better when dealing with so many calculations in chemistry and large numbers.

Katie Phan 1K

I haven't been to sessions/workshops. I find that just taking info straight from the book is really helpful, as well as supplementing with info from lectures.

Katie Phan 1K

Keeping track of states will be useful when you're doing total/net ionic equations and trying to see if a precipitate is formed.

Katie Phan 1K

Victor's summary is good!

Katie Phan 1K

It covers everything! I'm pretty sure it'll be the same format as the midterms.

Katie Phan 1K

Try not to think about it so much. Enjoy your Thanksgiving and be present!

Katie Phan 1K

Does anyone know what the letter grades are in regards to percentages/points? There's no scale that I know of.

Katie Phan 1K

It usually is implied that it's at equilibrium.

Katie Phan 1K

Bond length is basically associated with the energy required to break the bonds. Bonds that are shorter are stronger since the atoms/molecules are more tightly held, making it harder to break them apart.

Katie Phan 1K

They all have dispersion forces because at some moment in time, nonpolar molecules can have temporary dipoles.

Katie Phan 1K

Everyone else put it perfectly! Hope you understand now.

Katie Phan 1K

Does anyone know what sections of the textbook midterm 2 covers?

Katie Phan 1K

To my knowledge, there isn't a trick or life hack that will make it faster to do resonance structures.

Katie Phan 1K

I don't think it's too difficult to memorize the exceptions! Also sometimes when you look at a structure it just makes more sense when you think about its stability and formal change.

Katie Phan 1K

I'm not sure what the specific grade breakdowns are. Maybe email him?

Katie Phan 1K

What are you confused about?

Katie Phan 1K

I think he's expecting us to know whatever he has talked about in lecture such as lewis acids/bases but nothing else until we go into further depth.

Katie Phan 1K

I don't think we are expected to memorize SI units. The picometer conversion was actually on the formula sheet for the midterm! It was a little hard to find for me too.

Katie Phan 1K

Gamma rays have the smallest wavelengths and therefore have the highest energy as they have high frequency!

Katie Phan 1K

If you ever forget trends, just think about what you know about atoms. It's better to know the reasons why these trends occur rather than just remembering them. However, I do find it helpful to write arrows on my periodic table just to refer back to.

Katie Phan 1K

Valerie explained it perfectly!
Just find the energy of the light, convert it to eV, subtract the experimentally measured energy of ejected electrons, then convert the electron affinity to kJ/mole.

Katie Phan 1K

Hi. I'm having some trouble with the homework question pertaining to the wave patterns associated with the Bohr orbits of the hydrogen atom. Could someone explain to me what a sinusoidal and constant wavelength around the orbit looks like?

Katie Phan 1K

A good practice is probably rounding at the end!

Katie Phan 1K

It's included in the readings but I think Lavelle said it's not something we need to know.

Katie Phan 1K

Yes, I don't think you need to know how to determine it, just need to know the quantum numbers.

Katie Phan 1K

If you're still confused just look in the textbook! It'll tell you what exactly it's used for.

Katie Phan 1K

Is Schrodinger's equation on the midterm and if so, to what extent, if at all?

Katie Phan 1K

From n=6, an electron could drop to n= 5,4,3,2,1 so you have 5 spectral lines. The highest energy transition would be from n=6 to n=1, which would be the lower wavelength when thinking about the range. The lowest energy transition would be from n=6 to n=5, which would be the larger wavelength when t...

Katie Phan 1K

3d, 4s

Katie Phan 1K

It wouldn't be wavelike properties since it is not continuous like a wave, rather it is quantized.

Katie Phan 1K

to find the mass, divide the molar mass of O2 by Avogadro's number and then convert it to kg!

Katie Phan 1K

If so, you could probably get a webcam on Amazon for like $10.

Katie Phan 1K

Just kidding, i figured it out.

Katie Phan 1K

I'm kinda having trouble superscripting on Sapling? I'm trying to do it for an electron configuration but can't seem to do it.

Katie Phan 1K

These aren't just strictly STEM clubs but if you're looking for other clubs and activities there's a mega thread on reddit!
https://www.reddit.com/r/ucla/comments/ ... o_get_the/

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