CHEMISTRY COMMUNITY

Chesca Legaspi 2E

I just miss the experience of it all. Like the freedom of it all. Waking up and getting breakfast knowing I was about to doze though that 8am bio lecture. Meeting up with friends for lunch. Going home to my roommates (miss u chesca) and just spending time with everybody. (Definitely do not miss the...

Chesca Legaspi 2E

If you pass the class, you won't be able to retake it, but honestly I wouldn't sweat it too much. Your GPA is definitely important, but it doesn't define you obviously. I would say it's more important that if you do choose to continue on the series, you do your best to do better in 14C and CL. If yo...

Chesca Legaspi 2E

Honestly take a day off. I've been exhausting myself nonstop the past three weeks so yesterday I took the entire day to just chill in my room and binged all of WandaVision. Although I felt slightly guilty since we literally have a final this week, it was necessary. So just know that it's okay to tak...

Chesca Legaspi 2E

Taylor Newville 1C wrote:I'm looking forward to the libraries opening, it's been too long since I've been to one and they're my favorite places to study.

Oh absolutely same. When I heard that they were opening again, I got super excited. I miss studying in YRL and downing hot chocolate while I was at it haha.

Chesca Legaspi 2E

Last quarter's final was definitely a step up from the midterms. Honestly the midterms were child's play in comparison to the 14A final. That said, Lavelle was nice enough to recognize that the final was more difficult than he probably intended and curved it to give our grades a slight boost. That b...

Chesca Legaspi 2E

What is the best way to study for the final? Is it best to do the homework problems or online questions? Is the outline for the final 100% indicative of what is on the test? I would say the best way to study for the final is to do the textbook problems assigned on each outline. Dr. Lavelle usually ...

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305405193 wrote:Do you any of you guys know where to find any last minute extra help before the final this Sunday?

Definitely go to Office Hours and the UA review sessions! There's multiple every day leading up to the final and they honestly help a ton in understanding the material.

Chesca Legaspi 2E

Lately I've been craving Shabu Shabu and Ramen nonstop. Maybe it's just because it rained today and I'm craving some warm soup, but those are the foods that are on my mind at the moment.

Chesca Legaspi 2E

I understand both sides, but I would definitely say I'm on the side of Paradis. I know that if I were in Eren's position, I'd likely follow the same path that he's currently on, even if a lot of what he's doing is pretty morally wrong/ambiguous.

Chesca Legaspi 2E

For freshmen: What are you most looking forward to whenever we end up going back to campus? For sophomores and other upperclassmen: What do you currently miss the most about campus? I'm a sophomore and I really miss dancing in parking lots late at night, grinding while drinking hot chocolate in YRL,...

Chesca Legaspi 2E

Pinches Tacos and Northern Cafe are two of my absolute faves!!

Chesca Legaspi 2E

Chicken Tendies by Clinton Kane and love, or the lack thereof by Isaac Dunbar are the two songs I always have on repeat these days!

Chesca Legaspi 2E

I'm part of the triathlon club, APHC (Asian Pacific Health Corps), and SCOPE Patient Health Advocates! :D How was Foundations online? I heard amazing things about it and might try it out in the fall if we're in person! One of my friends is in SCOPE and she loves it! Also, I never did Foundations on...

Chesca Legaspi 2E

Hey guys, I'm kinda curious what everyone's involved in/passionate about outside of classes. What organizations/clubs are you guys a part of?? I've been involved with Bruin Women in Business, Product Space, USAC, and Foundations Choreography! :)

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I'm a total nerd when it comes to tech trends / product management stuff so a book that I read recently and absolutely loved was Swipe to Unlock! It breaks down a bunch of complicated tech concepts into simpler terms and also explains why certain big companies (FAANG) make the business decisions the...

Chesca Legaspi 2E

Honestly just attend as many UA sessions as you can and start doing textbook problems ahead of time so you have a lot of time to go over the material that you're struggling with. At least that's definitely what I'm planning on doing!

Chesca Legaspi 2E

Okay I don't know if this is necessarily my favorite food, but I've been craving ramen and hot pot so badly lately. I think it's been over a year since I've had hotpot and I swear I'm starting to go through withdrawals now lol.

Chesca Legaspi 2E

Now that scores are out, I'm definitely stressed about the final. I walked away from the midterm feeling pretty okay about it. I honestly thought I did better than I ended up doing so I'm just a little worried about how I'm gonna do on the final now. There isn't a lot of leeway in this class when it...

Chesca Legaspi 2E

Hey! I just recently got a part-time internship where I work for about 15 hours a week, but it's a remote position so I'm probably not undergoing nearly as much stress/physical exhaustion as others who are working in-person. It can be a lot to manage sometimes, but sometimes work is also a nice brea...

Chesca Legaspi 2E

I'm finishing up the last of my lower divs next quarter so I'll be taking Math 33B, Math 61, Physics 5C, and CS 33(if I can get it on second pass)!

Chesca Legaspi 2E

I'm pretty sure the final will be proctored similarly, but I know last time they combined zoom discussion groups to make proctoring everyone on the final more manageable so maybe that might happen again? Not that that makes much of a difference anyways.

Chesca Legaspi 2E

To go along with the last response, larger molecules typically have higher molar entropy values and seeing as Br is larger than F, HBr has a higher molar entropy.

Chesca Legaspi 2E

Hey I have a question on 4I.1 in the textbook. The question states: What is the total change of process in which 40.0kJ of energy is transferred as heat from a large reservoir at 800k to one at 200k? In the answer guide, the solution lists out that ∆S=-40000J/800K and ∆S=+40000j/800K. You add their ...

Chesca Legaspi 2E

Is anyone taking Chem 14BL, B and physics? I wanted to know if its too much to take at the same time. I'm currently taking 14BL, B, and Physics 5B along with linear algebra. I personally think it's pretty manageable, but it also depends on the professor you get. I'm taking physics with Schriver and...

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Like others have said, when it comes to phase changes, it's helpful to make a distinction between heat and temperature as they're similar, but different. The internal heat of a system changes during a phase change, but the temperature outside of the system doesn't change as all of the action occurs ...

Chesca Legaspi 2E

From what I've heard, the midterm is only going to include material from outlines 3 and 4. We shouldn't need to know anything from outline 5. That said, I'm sure Dr. Lavelle will be sending out an e-mail some time this weekend clarifying exactly what we need to know going into next week!

Chesca Legaspi 2E

I'm pretty sure the midterm only covers outlines 3 and 4 so we shouldn't have to worry about anything after that. I think that Dr. Lavelle will probably send out an e-mail this weekend clarifying exactly what we need to know going into this week!

Chesca Legaspi 2E

The UAs definitely do review sessions the week of the midterm. My two favorite UAs are Hannah Chew on Tuesdays and Justin Sarquiz on Thursdays!

Chesca Legaspi 2E

I focus on making sure I know how to explain every concept on the outlines that any exam covers. I watch youtube videos to clear up any troubles I'm having in regards to understanding material and attend lots of step-up review sessions in the weeks leading up to the exam as well. Usually, I do textb...

Chesca Legaspi 2E

Thanks for sharing Connie!! Always appreciate how helpful and positive you are both here on chem community and in the GroupMe :)

Chesca Legaspi 2E

I'm currently in 14BL and one of the things I have to say about the class is that it most definitely isn't easy grading wise. The content is pretty simple and easy to understand, but the grading scheme is pretty tough. Sig figs and precision are extremely important + the rubrics for the labs are so ...

Chesca Legaspi 2E

Honestly besides doing textbook problems, I'd also recommend trying to explain concepts to a friend or even just yourself. If you look at each point on the outline and can confidently explain each topic listed, you're in good shape for an exam. Also watching youtube videos from channels like the Org...

Chesca Legaspi 2E

Like others have said, I would just advise you to take your time and try not to rush through problems. It's better to do it thoroughly and precisely the first time, even if that results in you having less time to check over everything. If you were deliberate at every step, your chances of getting th...

Chesca Legaspi 2E

The textbook problem, 6E.3, asks us to calculate the pH of a couple of diprotic acids, ignoring second deprotonations only when approximation is justified. How do we know when approximation is justified and the second deprotonation can be ignored? The textbook seems to imply you can ignore the secon...

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The problem says to calculate the pH given 0.055 M of AlCl3 (aq). I got to the point where you set up x^2/.055 = Ka. The solutions guide solves for x by listing Ka as 1.4 x 10^-5, but this is not explicitly stated in either the problem or the charts provided. Does anyone know where the (1.4 x 10^-5)...

Chesca Legaspi 2E

You can definitely take 14C before 14BL. I think the only thing is you probably have to take 14BL before you take CL, but I don't think there have ever been any problems with people taking 14C before BL.

Chesca Legaspi 2E

We definitely won't have to memorize them! We should be given them explicitly, it's just a matter of whether we'll have to use a table/chart to find them or whether the question will just straight up give the value to us. I'm inclined to think that if we need Ka or Kb for our calculations, then the ...

Chesca Legaspi 2E

Hi there! I'm think you're asking where they got the Kb value? My best guess is that the book tells you at the top of the exercises to refer to table 6C.1 and 6C.2 for the Ka and Kb values b/c we definitely do not have enough information to calculate it ourselves. Hope this helps! :) Ohhh okay, got...

Chesca Legaspi 2E

For textbook problems 6D.5 and 6D.7, before coming onto chem community, I was really confused as to how solve the problems because we weren't given the values for the equilibrium constants explicitly. On the midterm, will we be given Kb and Ka values explicitly or will we have to use some sort of ta...

Chesca Legaspi 2E

Hey guys: I'm not sure if someone has asked this already, but I'm really confused on how to go about solving 6D.5 in the textbook. I got to the point of solving that Kb should be equal to x^2/0.057-x, but I wasn't sure what to set it equal to since they didn't give us any product values we could hav...

Chesca Legaspi 2E

Dr. Lavelle sent out a clarifying e-mail that only content from weeks 1-3 will be tested so as long as you study the outline points he mentioned, you should be all good!

Chesca Legaspi 2E

I had this problem a lot last quarter in 14A. Something that helped me was switching from chrome to safari. For whatever reason, chrome happens to act up alot with the sapling textbook so I'd suggest using a different browser. If that doesn't work, maybe try clearing your cache and reloading the page?

Chesca Legaspi 2E

As long as you study the outlines for weeks 1-3, you should be fine! As far as I'm aware, there won't be any week 4 content on our first midterm even though it isn't until Friday. :)

Chesca Legaspi 2E

I know Dr. Lavelle just sent out an e-mail that our midterm will only cover material from weeks 1-3. Does anyone know if the UA step-up/workshop sessions this coming week will be midterm review or if they'll be focused on week 4 content?

Chesca Legaspi 2E

Hey guys, I know that midterm 1 is next Friday, but does anyone know up till what lecture or outline the exam will cover? Someone said in the groupme today that it would only cover up to today's lecture, but I'm not sure if that's been verified anywhere. Could someone please let me know? Thanks so m...

Chesca Legaspi 2E

Also if you can't get access to the groupme google drive for whatever reason, sometimes if you just search for certain UAs or key words on chem community, links to old UA worksheets and their answers will pop up if you need extra practice!

Chesca Legaspi 2E

One science movie that I absolutely love is GATTACA. I had to watch it in AP Bio my junior year of high school, but it was one of my greatest takeaways from that class. To this day, it's one of my all time favorite movies and the soundtrack is just top tier. In terms of an actual comfort movie, I ad...

Chesca Legaspi 2E

While sig figs are a good concept to know (and there's plenty of practice to do for review online), they're not utterly essential to this course. Like many others have said, both the TAs and Dr. Lavelle have stressed that sig figs will not be tested on our exams. Essentially, the differences in answ...

Chesca Legaspi 2E

Sapling and Chem Community grades usually get updated at the end of every week when they're due. As far as I know, they're assessed based on a credit/no-credit policy so as long as you did all the questions before the due date, you should be getting 100s. But yeah, whatever gets entered into CCLE at...

Chesca Legaspi 2E

Like most other people have said, the UA sessions are really helpful. Seriously, I know a lot of people think that supplemental hours like office hours might not be super helpful, but the UA program that Dr. Lavelle took the time to organize is really great in terms of helping you review content and...

Chesca Legaspi 2E

In terms of how they're going to be proctored, I'd assume will either all join one large zoom that Dr. Lavelle and the TAs will be proctoring, or we'll join separate smaller zoom proctoring groups that our TAs will proctoring during exam time. Of course, nothing has been confirmed yet, but I'm sure ...

Chesca Legaspi 2E

Same as in 14A last quarter, the audio-visual topics he currently has posted on the site are the only ones we'll get. That said, like others have advised, if you're struggling to understand a topic, going to UA sessions is super helpful. Also, watching videos on youtube from channels like the Organi...

Chesca Legaspi 2E

I have the same issue and I know I saw another post about the glitch somewhere else on Chem Community. I'm not sure what's up, but if your grade was recorded in CCLE as a 5/5, I wouldn't worry about it. Dr. Lavelle will probably address it at some point through an e-mail, I'm sure.

Chesca Legaspi 2E

Like others said, try disabling pop-ups. If that still doesn't work, re-starting your computer or using a different browser can be helpful too! Usually switching to a browser like Safari works for me when my Chrome is bugging.

Chesca Legaspi 2E

So I noticed on the syllabus that it said our midterms would be administered during class time, but I just wanted to make sure I wasn't mis-understanding anything. Class time means that they'll be administered during lecture as opposed to discussion (like they were last quarter), right?

Chesca Legaspi 2E

Like everyone else said, final grades should officially be out Saturday, but I think most other assignments (with the exception of chem community points) are already inputted into gradebook on MyUCLA. If you see any discrepancies on there, make sure you e-mail your TA or Dr. Lavelle before Friday ju...

Chesca Legaspi 2E

The recordings themselves aren't being posted, but the review slides from the recordings are being posted! Dr. Lavelle already posted the slides from today's review session. I'm pretty sure he sent out an e-mail about it too. :)

Chesca Legaspi 2E

Hi, I'm not sure if this has been asked already, but I heard that in previous quarters, Chem 14B has had extra (general) tests on top of 2 midterms and a final. Does anyone know if 14B will be operating that way next quarter or if it'll be more similar to how 14A was administered this quarter?

Chesca Legaspi 2E

Typically, you can predict the general strength of oxyacids based off electronegativity and the oxidation number of the central nonmetal atom. The acid strength will increase as the electronegativity of the central atom increases.

Chesca Legaspi 2E

From my understanding, Bronsted-Lowry interactions are based on the transfer of protons, whereas Lewis interactions involve the sharing of electrons. Bronsted acids are proton donors and bronsted bases are proton acceptors. Conversely, lewis acids are electron acceptors and lewis bases are electron ...

Chesca Legaspi 2E

I was actually browsing chem community trying to make sure I haven't missed any important announcements prior to the final so I was stressing. Just saw your post and it definitely helped me re-center and feel a lot better going forward in the week. Thanks for the extra push of motivation, just gotta...

Chesca Legaspi 2E

As others have said before, it looks like we'll be having exams in lecture, but this quarter, the TAs and Dr. Lavelle have been fairly accommodating in regards to making sure everyone has a fair experience taking the test so if you absolutely can't get out of a lecture conflict, I'm sure they can he...

Chesca Legaspi 2E

Also, if for whatever reason you can't make the time slot for international students, I think if you e-mail your TA they might be able to work something out with you in regards to a possible makeup time. So far, Dr. Lavelle and the TAs have been fairly accommodating in regards to ensuring everyone h...

Chesca Legaspi 2E

Because the final is set to be during a longer time span (2 hours I believe?), I'm pretty sure we'll all be taking it at the same time instead of in discussion section, but nothing's been set in stone so I could be wrong about that. Like everyone else has said, it should be cumulative, but I'm prett...

Chesca Legaspi 2E

The class has honestly been pretty manageable so far in terms of keeping up with the workload and finding resources to make sure I fully understand the material. That being said, I do think the testing system could be improved somewhat. For the final, if we all take it during the same time slot, I h...

Chesca Legaspi 2E

If you have other friends who are taking the class or a class similar to this, I would recommend trying to explain the topics on the outlines to them. If you can explain a topic well enough that someone can understand what you're talking about, then you'll know that your understanding is where it ne...

Chesca Legaspi 2E

As others have said, because transition metals have d-orbitals, they're definitely capable of producing expanded octets and breaking the octet rule, but also keep in mind that just because they're capable of producing an expanded octet, that doesn't mean they'll always form one. So there definitely ...

Chesca Legaspi 2E

Another good thing to know about d-orbitals is that they allow elements to produce expanded octets. Because of this, elements in the third row or below in the periodic table can have an expanded octet. This is because, for n = 3, d-orbitals can accommodate more electrons by participating in bonding ...

Chesca Legaspi 2E

Are radicals and free radicals the same thing? I've seen both terms used in reference to compounds with unpaired electrons, but I wasn't sure if there was a difference between the two or if they were essentially the same?

Chesca Legaspi 2E

As others mentioned, the reason that certain elements are able to form expanded octets is because of the presence of the d-orbital. For n = 3, d-orbitals can accommodate more electrons by participating in bonding with other atoms, therefore producing an expanded octet. But of course, for this to hap...

Chesca Legaspi 2E

I don't think Dr. Lavelle has confirmed anything yet, but I'm assuming there'll probably be some sort of zoom proctoring session we'll have to join, most likely done by TA, and we'll take the final during that time. I'm sure there'll be some sort of accommodation for students in different time zones...

Chesca Legaspi 2E

I'm going to try enroll in 14BL on my second pass, but I know that it has a waitlist. Does anyone know if 14BL operates like 14B where all students waitlisted get enrolled in the class eventually, or if you're only enrolled if someone actually drops the class?

Chesca Legaspi 2E

I believe ion-ion interactions lead to an ionic bond. They result from two atoms with differences in electronegativity and opposite charges bonding to one another. Thank you for the clarification. Since we are talking about interactions between atoms, can I still consider ion-ion interactions as ex...

Chesca Legaspi 2E

An easy trick that I use to tell if a molecule is polar or not is that if a molecule has different terminal atoms or a lone pair around the central atom, it'll be polar for sure!

Chesca Legaspi 2E

Like most people have said, 12 units is the minimum, but also be aware that if you only have 12 units, you have to stick through all your classes for the quarter without dropping. If you drop any class, you'd have to enroll in another before your second pass ends in early January so that you don't f...

Chesca Legaspi 2E

In general, it typically goes that a 93+ is an A and a 90-92.9 is an A-. I think an 87-89% is a B+, but I'm not really sure what the grading scale is past that. Also, another thing to be aware of is that most STEM classes don't round your grade up so even if you have a 92.9%, that would constitute a...

Chesca Legaspi 2E

Along with khan academy, there are youtube channels like the Organic Chemistry Tutor that often review difficult chem concepts and simplify them a whole lot so they're far easier to understand. Along with explanations, those videos typically have practice problems worked into them as well so you get...

Chesca Legaspi 2E

I know that sometimes when I get test anxiety, I tend to spiral so something I like to try to have nearby is a grounding item -- something to look at that can bring me back to center and remind me that everything is okay. Usually, before I go into a test, I leave myself a little post it on my laptop...

Chesca Legaspi 2E

Personally, I find working with a friend on call to be really helpful. It doesn't even have to be a friend who goes to UCLA or is in the same class. Most nights, I do my work on zoom with my best friend on call in the background. We'll spend the beginning of the call catching up and then we both jus...

Chesca Legaspi 2E

Hi there! I'm so sorry if this has already been asked, but I couldn't find a post about it so I thought I'd post a question just in case. Does anyone know if any of the UAs or TAs are holding a review session ahead of next week's midterm? I know one of the UAs held a session last time, but I wasn't ...

Chesca Legaspi 2E

No idea how many spots there are on the waitlist, but this quarter, Lavelle did admit everyone off the waitlist into Chem 14A so I'm thinking he might do the same for 14B since he's our instructor again.

Chesca Legaspi 2E

Also none of your posts from previous weeks carry over so if you miss one week but do 10 the next week, it still won't account for that week you missed :'( I've heard some people saying though that there might be future opportunities to make up chem community points if you did miss a week, but those...

Chesca Legaspi 2E

Is it recommended that we take Chem 14BL alongside Chem 14B or is it better to wait to take it until after we've finished Chem 14B? Trying to plan my class schedule for next quarter haha.

Chesca Legaspi 2E

I'm so down, thank you so much for organizing this! :))

Chesca Legaspi 2E

I heard that in all likelihood we won't be able to. Sometimes they like to keep the questions confidential so they can re-use them for future tests. At least, I know this is how it was for the LS7 series when I took it and it seems like a few UAs are echoing that we likely won't be able to review th...

Chesca Legaspi 2E

Follow green! :)

Chesca Legaspi 2E

Not sure how true this is, but I heard that there might have been an error in one of the questions on the midterm so because of this the TAs might have to look at some of them individually, and that might mean that grading might take a little longer than expected. :'( Hopefully, we do get them back ...

Chesca Legaspi 2E

If there won't be any more audio-visual modules, does anyone know any other good external resources to use when it comes to simplifying/clarifying topics? Sometimes I feel like I can't fully grasp concepts from lectures alone and sometimes my schedule conflicts with step-up session times so I'm not ...

Chesca Legaspi 2E

After re-watching Lecture #10, I have come to the conclusion that I am still confused on what the ml quantum number is. I know that its values are partially determined by the value of l, but what exactly does this mean? Can someone clarify/summarize what the ml quantum number specifies and how its v...

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Does anyone know what determines an electron's spin state? Like what would cause an electron to spin upwards rather than downwards and vice versa?

Chesca Legaspi 2E

Maybe I missed the explanation when I was watching this week's lectures, but what exactly causes orbitals to take on different shapes? Why is the s orbital shaped like a sphere and all the others are shaped so differently?

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Hi! I'm not sure why so much of Wednesday's lecture seemed to go over my head, but I'm a little confused on orbitals. I understand that the higher the energy of an electron, the larger its orbital will be, but how exactly does this relate to Schrodinger's Wave function? I guess what I'm asking in a ...

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In lecture today, Dr. Lavelle mentioned that H is a Hamiltonian, which is a double derivative, but I still don't fully understand what this means. What is the significance of H being a double derivative? Does that mean it's a constant of some sort?

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In today's lecture, we learned that electrons are described as a "circular standing wave" around the nucleus, but what exactly is a circular standing wave? How are they different from other types of waves? And are electrons the only particles that form waves in this pattern?

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During today's lecture (10/19), when describing the DeBroglie Equation and its application to electron movement, Dr. Lavelle frequently mentioned that "mass would dominate" against momentum/speed, but I still don't quite understand what this means. Could someone please explain?

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On Dr. Lavelle's site, there's a link to a document with constants (like the speed of light and Planck's constant) that I'm assuming we can use on exams. However, I noticed that some of these constants are fairly long. Are we allowed to round these constants to make them shorter when doing our calcu...

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Can electrons jump up multiple energy levels at once or do they have to reach a certain stage before they can reach the next energy level afterwards? For example, if an electron was at energy level n = 1, could it jump up to n = 4, or would it have to pass/stop(?) through energy levels n = 2 and n =...

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Spectral lines are lines that denote certain light frequencies. By exciting an atom, the frequency of light given by that atom is unique to that atom. It is important in spectroscopic analysis of the light given off by excited atoms, thus showing only the photons of a particular energy to be given ...

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Hi! I was wondering if we'd be able to receive partial credit on an exam if we did all the steps of a problem correctly, but rounded significant figures wrong, or if we'd get the entire question wrong. Just wondering because I've had previous classes that have marked questions completely wrong for a...

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In lecture, Dr. Lavelle said that photons require certain unique levels of energy in order to be excited and subsequently ejected from surfaces, and that this is the reason why light at shorter wavelengths can eject electrons even at low intensities while light at longer wavelengths cannot eject ele...

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