CHEMISTRY COMMUNITY

Savana Maxfield 3F

Hey! Hmm, the final was this morning, hopefully you got to take it!

Savana Maxfield 3F

Hi! Does anyone know when final grades will be released? :)

Savana Maxfield 3F

Savana Maxfield 3F

Hi! I believe that thermodynamics refers to the behavior and equilibrium of a system, while kinetics refers to the rate and the pathway at which a particular process will occur. Hope this helps!

Savana Maxfield 3F

Jacob Schwarz-Discussion 3I wrote:Is this referring to the final or the 2nd midterm????

I'm not exactly sure, I know in past years, the class was structured differently (with tests in addition to the midterm). Regardless, the final covers more than this! I would check the outlines to double check which sections are covered :)

Savana Maxfield 3F

When delta G=negative, the reaction is spontaneous!

Savana Maxfield 3F

My TA let us highlight for the constants and equation sheet for the last midterm, but as everyone else has said, I would recommend confirming with your TA first.

Savana Maxfield 3F

In the Final Information PDF on the website, Dr. Lavelle did not say how many textbook problems would be on the final unfortunately :(

Savana Maxfield 3F

Maybe this is a silly question, but when did we learn this?

Savana Maxfield 3F

Hi! I believe because part b is just asking for the rate law of each elementary step, the rate law will just be based off of the coefficients of the reactants (in this case 1).

Savana Maxfield 3F

Hi! I think if OH- increases, the pH increases, and the rate decreases (because [OH-] is in the denominator.

Savana Maxfield 3F

Yes! You are correct! You have to solve for them each separately, then add them together.

Savana Maxfield 3F

I'm taking 14BL! I couldn't get into 14C :/

Savana Maxfield 3F

I don't think so... This is what the solutions manual says:

Savana Maxfield 3F

Sorry, could you clarify what you mean by this? 4 molecules in the overall shorthand notation?

Savana Maxfield 3F

Are there any examples of problems with this concept that we will be required to know for the final?

Savana Maxfield 3F

I think they set K=[H+]/[OH-] because when the pH is equal to 7, both [H+] and [OH-] are equal to 1.0x10^7M

Savana Maxfield 3F

Hi Claire! I am in AMWA and Rewritten, both of which are really great clubs! I've also wonderful things about UAEM, MedReach and AIM! I hope this helps :) Sending good vibes for your studies this weekend. I'm in MedReach, and I love it! We do outreach to local high schools to educate students about...

Savana Maxfield 3F

805295074 wrote:Hey! I'm apart of YMAA (youth movement against Alzheimer's) and MEDLIFE EAch are a lot of fun and MEDLIFE has trip every year to Peru to help the communities there!

I'm in MEDLIFE too, I love it!

Savana Maxfield 3F

Hi y'all, I just thought I would make this post to see if anyone else is feeling a similar way and how they approach that feeling! As a pre-med freshman, everything being virtual, these past two quarters have been ~rough~ for me, I worry about future UCLA classes and sometimes I doubt if medical sch...

Savana Maxfield 3F

Hi! Do we know how many questions will be on the final exam?

Savana Maxfield 3F

I was also wondering this! It seems as if some problems ignore the first deprotonation, while some ignore the second deprotonation (unless I am misinterpreting them). So if anyone knows the answer, it would be greatly appreciated :)

Savana Maxfield 3F

mmol means millimole; 1 mmol is equal to 0.001 mol!

Savana Maxfield 3F

I think the original post was from last winter, when the class was structured a bit differently (with more tests)!

Savana Maxfield 3F

^I am also confused on how to do this problem, if someone could explain, that would be great :)

Savana Maxfield 3F

^I'm struggling with this one as well. If someone could explain, that would be great :)

Savana Maxfield 3F

We're using this Zoom link now: https://ucla.zoom.us/j/92410197271?pwd= ... tFbUtkdz09
Join!!!

Savana Maxfield 3F

Sable Summerfield wrote:
Charlotte Adams 1A wrote:Is it still from 2-4?

Also, If I am a little late can I still participate?

Yes join!!

Savana Maxfield 3F

I love the Organic Chemistry Tutor on Youtube! Super helpful :)

Savana Maxfield 3F

Electrolysis is the process in which an electric current is used to create a chemical change. It helps me to remember that the suffix -lysis means "breaking up." Electrolysis is breaking something up with electricity, hydrolysis is breaking something up using water (commonly seen when wor...

Savana Maxfield 3F

Hi! I am confused on which reduction potentials values and half reactions to use. Since not all half reactions for each substance have the same amount electrons transferred, which do we use? I thought that you could choose the half reaction, as long as the amount of electrons transferred is the same...

Savana Maxfield 3F

Can someone explain what electrolyzed means in this context and why it is relevant to the problem?

Savana Maxfield 3F

For these types of problems, do we always assume the temperature is 298 K?

Savana Maxfield 3F

Just bringing this post back, except the date of the final will be Sunday, March 14th. Make sure you are aware of Daylight Savings!!

Savana Maxfield 3F

Does anyone have any recommended review sessions? I've only been to a few of the same peoples and I was wondering if anyone stood out to you guys specifically in terms of covering the most content? Honestly, all of the TAs and UAs are awesome, I would recommend choosing the review sessions for topi...

Savana Maxfield 3F

Kelly Singh wrote:
Hannah_Kim_1I wrote:Rocky by Still Woozy!

he is SO good

I LOVE Still Woozy! He's amazing!!

Savana Maxfield 3F

I'm in a few different organizations! I'm involved in Greek life, PUMP (Pre-med Undergrad Mentorship Program), MedReach, She's the First, MEDLIFE, and an intern for USAC! If anyone has any questions about any of these or is thinking about getting involved, I would love to talk :)

Savana Maxfield 3F

I'm in a few different orgs! I'm a part of GlobeMed and Project RISHI, which are both global health organizations but have very different takes on how to approach health. I'm also in HOSA and CaHPSA, which are pre-med orgs. How is GlobeMed? It sounds really interesting! I'm definitely considering a...

Savana Maxfield 3F

Does the time for the final depend on your lecture or is it one time for all lectures like Chem 14A?

Savana Maxfield 3F

I already have 50 points on myUCLA, but I'm not sure. I'm going to keep posting because I don't want to risk it haha!

Savana Maxfield 3F

I'll be there! Will Dr. Lavelle be there too? :)

Savana Maxfield 3F

I like to remember it as:
AN OX (anode--oxidation)
RED CAT (reduction--cathode)

Savana Maxfield 3F

For this question, I had the right equation, but Sapling was saying it was incorrect. So I changed the order of the species and got it right. Maybe change the order of your reaction to see if that will help?

Savana Maxfield 3F

Taylor Newville 1C wrote:Does he offer extra credit?

Unfortunately, he typically does not offer extra credit :( The only "extra credit" available will be on exams in the form of bonus questions, I believe.

Savana Maxfield 3F

I am also struggling with this problem, if someone could explain how they balanced the overall equation, that would be great! I keep getting the wrong answer :(

Savana Maxfield 3F

I have a lot of anxiety when it comes to this class and taking exams in general, and I find it relieving to talk to family and friends to take a break from studying!

Savana Maxfield 3F

Relating to this question and standard reduction potentials, conceptually, why does the half reaction with the larger standard reduction potential occur at the cathode?

Savana Maxfield 3F

Adding on to the above reply, a state function does not depend on the path taken. A path function (work and heat) depends on the path taken!

Savana Maxfield 3F

A similar question: how do you not freak out when you see questions on the test that you don't know how to do? I struggle with this because when I see a question that I am not sure to do, I tend to get distracted. Does anyone have any tips?

Savana Maxfield 3F

I don't know for sure, but it typically takes about a week!

Savana Maxfield 3F

I plan on getting a lot of sleep this weekend and catching up on episodes of The Bachelor that I am behind on! Other than that, last night I treated myself by baking chocolate chip cookies :) I caught up on the Bachelor too! It's such a ridiculous show, but makes me forget about the stresses of sch...

Savana Maxfield 3F

I saw that Dr. Lavelle mentioned office hours tomorrow in the email he sent earlier, just to confirm: the TA office hours listed in the email will be happening? I've noticed that typically TAs don't host office hours on the day of the exams because they have to proctor for their discussion sections....

Savana Maxfield 3F

Textbook question 4.23 has content from the quantum section of 14A, should we be pretty comfortable with these concepts for the midterm as well? Do you think there is a chance we would be tested on a problem requiring quantum content?

Savana Maxfield 3F

I definitely agree. The focus problems felt a lot more complex than the other ones. I also feel like he usually pulls one or two complex ones from the textbook, so unfortunately, I would be familiar with these since they are on the outline :/

Savana Maxfield 3F

Hi! For part a, first, write the balanced equation for the reaction, which is C6H6 + 15/2O2--> 6CO2 + 3H2O, then use the equation w=-P∆V=-∆nRT to solve for work. Next, find the change in moles of gas (moles of gas in the products-moles gas in reactants), and plug this into the equation w=-∆nRT, alon...

Savana Maxfield 3F

For this problem, for part d, the answer key says the entropy change of the surroundings is primarily a result of the dispersal of thermal motion. Can someone please explain this? :/ Thanks!

Savana Maxfield 3F

Do the posts correspond exactly to timing (like if you don't have the exact amount each sunday you miss the 5 points) or is it more based on the ultimate amount you have posted? Last quarter it really depended on the TA! I would try to complete each 5 by the due date just to be sure. If you're conc...

Savana Maxfield 3F

Why does disorder increase when volume increases? Because the substance occupies a larger volume?

Savana Maxfield 3F

Hi! So I would start off by looking at the equation ∆G=∆H-T∆S. If ∆G is negative, the process is spontaneous. If it is positive, the process is nonspontaneous. Use this information to determine which signs of ∆H and ∆S will make ∆G positive or negative. Hope this helps! Feel free to respond with ano...

Savana Maxfield 3F

Hi! I'm not sure if this answers your question, but the problem is asking how ∆H and ∆S change when changing phases. For example, when a substance changes phases from a solid to a liquid, how do ∆H and ∆S change?

Savana Maxfield 3F

To calculate ∆S, you use the equation ∆S=-∆Hsys/T. The Sapling prompt should give you a value for ∆H, and you just divide this by the temperature given in Kelvin.

Savana Maxfield 3F

Adding onto the previous post, you will also need to convert the value for R (8.314 J/K*mol) to be in the units kJ/K*mol because the standard change in Gibbs free energy is given in kJ/mol! This is where I kept messing up on my Sapling, so I would double check that the units match :)

Savana Maxfield 3F

I'm very confused as well. I looked it up and saw both versions, so I'm not sure what the correct version is. If anyone knows, please share!!

Savana Maxfield 3F

Great, thank you all!! :)

Savana Maxfield 3F

Will any TA office hours be held on Monday 2/15?

Savana Maxfield 3F

Is anyone else having trouble playing Lecture #16? I keep getting an error when I try to watch :(

Savana Maxfield 3F

The same thing happened to me, but then all of my scores showed again this afternoon! I wouldn't worry about it :)

Savana Maxfield 3F

I don't think exothermic reactions are always spontaneous? I'm pretty sure it also depends on the temperature and the entropy as well.

Savana Maxfield 3F

For anyone who assigned the step up sessions, would you guys recommend doing this? How helpful were they with preparing you for the midterm? I highly recommend UA sessions, especially if you are struggling to get a grasp on the material. Step Up sessions are great for a walk through of concepts and...

Savana Maxfield 3F

The arrows are pointing to which is spontaneous vs not spontaneous (so the top image is not spontaneous, while the second one is). I believe what this image is describing, is that once you open the valve of the gas, we see in the second image, that the gas expands and occupies more volume (we see th...

Savana Maxfield 3F

This is so helpful, thank you so much! :) I've personally struggled with when to do the textbook problems because they are a good method to check your understanding as we go through the material, but it also seems smart to do all of them closer to the exam. That being said, it's difficult to find ti...

Savana Maxfield 3F

I'm currently taking 14B, planning to take BL next quarter and take a break from regular chemistry classes and take chem14c starting fall next year (fingers crossed it'll be in person) I'm doing the same thing! Does anyone know if it's difficult to secure a spot in 14BL? I wondering if I should enr...

Savana Maxfield 3F

I keep getting the wrong answer for this question :( How do you calculate the volume change for this problem since we have to solve for volume using PV=nRT and not another volume is given?

Savana Maxfield 3F

Should n equal PV/RT, not RT/PV? Since to isolate n you need to divide PV by RT, not the other way around.

Savana Maxfield 3F

I agree with the comments above! It typically takes a little while, I've noticed, for the CCLE grade to update, so I wouldn't worry too much about it! If it's been a couple of days and it still has not updated, then I would reach out to your TA.

Savana Maxfield 3F

It typically takes about a week! And last quarter I found my grades under the "Exam and Homework Grades" tab on MyUCLA (but I'm pretty sure it's also posted on CCLE)!

Savana Maxfield 3F

Congrats everyone! Good luck on the rest of your midterms!! We're gonna be so prepared for Midterm 2 :)

Savana Maxfield 3F

Thank you for sharing! :) I also highly recommend going to UA workshops, it is SO helpful to stay up to speed with current content (and make sure you are keeping up with the pace)! And completing textbook problems while we learn the content (instead of waiting until right before the midterm) is anot...

Savana Maxfield 3F

I agree with most of what's been said above! I finished a bit early, so I had some time to go over my answers, but ended up overthinking all of them (leading to changing a couple answers) which I think is going to end up harming my grade :(

Savana Maxfield 3F

Mariah Disc 2C wrote:Love this thread! I treated myself with some ice cream!

Yes, I treated myself to some ice cream too! Coconut milk chocolate ice cream from Trader Joes to be specific, I'd highly recommend for any Westwood people :)

Savana Maxfield 3F

Hi! Can someone tell me if the formula (products-reactants) is the same for calculating enthalpy of combustion as it is for enthalpy of formation?

Savana Maxfield 3F

Hi! Will there be any TA office hours on Friday, the day of the midterm, for any last minute questions?

Savana Maxfield 3F

Yeah, I agree. Dr. Lavelle hasn't explicitly told us, but I would say bullet points 1-7, as well as bullet points 11 and 19 will probably be best to know for the midterm.

Savana Maxfield 3F

So for part c (or the last question), you will want to use the equation you listed (but use CS2 instead of S8): ΔH=nCS2×ΔH∘ Since 399 kJ of heat is absorbed, this will be the value for ΔH. Then use the value of ΔH∘ given in the problem, which is +358.8, and divide this by 4 because there are 4 moles...

Savana Maxfield 3F

I'm working on this problem right now, and I'm still trying to figure out part c. but for part b., you need to convert the 173 g to moles, then from there you multiply that value times the delta H value divided by 4 (because there are 4 moles of carbon in the reaction). Hope that helps! When I figur...

Savana Maxfield 3F

I got a different answer than the solutions manual for this question, can someone explain how they did this problem? How did you calculate Kc? Thanks in advance! :)

Savana Maxfield 3F

StephanieGrigorian2J wrote:I mostly listen to alternative and neo-psychedelic/soul music (Tame Impala, Dayglow, Khalid etc) or anything that just makes me feel good! But I've been listening to Frank Ocean, Brent Faiyaz, and Harry Styles lately :)

We have like the same music taste, that's awesome :)

Savana Maxfield 3F

Does anyone know if this has been confirmed? Or if Dr. Lavelle has said anything about how much of Outline 3 will be tested on Midterm 1?

Savana Maxfield 3F

This is so nice of you to share, and it'll be really helpful when studying! Thank you so much :)

Savana Maxfield 3F

Midterms for 14A were not open book, they were proctored using Respondus and over Zoom! If you go to Dr. Lavelle's 14B class website, there is a link to the constants and equations sheet and the periodic table, which we are allowed to have on all tests! Here's what it looks like:

Savana Maxfield 3F

Does anyone know how many questions there will be on the midterm and how many points each question will be worth? This midterm is worth less than the midterms in 14A, so I'm just curious what the change in distribution of points will be! I'm hoping each question will be worth less, as opposed to hav...

Savana Maxfield 3F

For the chemistry fraternity, Alpha Chi Sigma, does anyone know when they start offering tutoring? Is it week 3? I just checked and yes they are offering tutoring starting week 3. For chem 14B specifically, I've gotten to do two sessions with Selina Park! She's really nice and helpful :) Check thei...

Savana Maxfield 3F

I also had trouble with this one. The explanation above makes sense, thank you! But I was also confused on how we would write the equations that are listed in the solutions manual. Can anyone explain this?

Savana Maxfield 3F

Thank you so much, this was so helpful! I did not even know you could download the solutions manual (and they give you steps to solve the problems, which is even better!)

Savana Maxfield 3F

I've recently had an issue with my textbook solutions not appearing. I've tried refreshing the page, and staying on the page to see if maybe they just need more time to load, but nothing has worked. Has anyone had this issue before or have any advice on how to fix it? It's quite frustrating that I c...

Savana Maxfield 3F

Can someone explain how they worked through this problem? I'm not getting the right answer :(

Savana Maxfield 3F

For the chemistry fraternity, Alpha Chi Sigma, does anyone know when they start offering tutoring? Is it week 3?

Savana Maxfield 3F

Yes, I agree with the post above. A good way that I use to determine if an ICE table is necessary, is to look for key words "initial concentration" and "equilibrium concentration", and usually that will give you a pretty good hint if an ICE table is necessary.

Savana Maxfield 3F

I think it generally depends on the leniency of the TA. I think it's probably safe to try and stick to 5 per week, but I would recommend emailing your TA for clarification!

Savana Maxfield 3F

I love to hike and go for runs to destress! I've also recently gotten into yoga, which is a great way to be active while also being relaxed!

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