CHEMISTRY COMMUNITY

Annette Fishman

I am really happy the chemistry final is over with. I have two more and then I'll be finished, so I'm still stressed out and ready to be done with this quarter. Even though I made sure to get ahead of the chemistry (last quarter I fell way behind), I still think I could have done a better job at tim...

Annette Fishman

Since our final was today, I would say maximum a week or so? Same as midterm and the previous final as well.

Annette Fishman

Lavelle doesn't teach Chem 14C sadly :(

Annette Fishman

Dr Lavelle, Thank you so much for being a kind, supportive, and caring professor for this accelerated introductory course. You care so much about your students, and that shows with your consistency in hourly lectures, Chemistry Community, daily review sessions, etc. You truly want your students to s...

Annette Fishman

I would go over simple examples, like the ones he talked about during his lecture on kinetics. I don't think the final is going to go way in depth on the biology.

Annette Fishman

The uncatalyzed reaction proceeds via a one-step mechanism (one transition state observed), whereas the catalyzed reaction follows a two-step mechanism (two transition states observed) with a notably lesser activation energy. Enthalpy is a state function, so we are only focusing on final minus initi...

Annette Fishman

Bomb calorimeters are sealed and insulated, so it can be assumed that they're all isolated systems.

Annette Fishman

delta U, q, and w are all equal to 0 for an isolated system since there is no energy transfer between the system and the surroundings

Annette Fishman

kilojoules per mole or joules per mole are the appropriate units for activation energy

Annette Fishman

Chemical equilibrium, periodic table trends / atomic configuration, kinetics!!

Annette Fishman

I joined and ended up having a blast!! Thank you so much for something so lighthearted in a moderately stressful class

Annette Fishman

Burnt out. Feel like I am constantly running out of time. Other than that ... excited for spring break :))

Annette Fishman

Breaking Bad, How to Get Away With Murder, Orange is the New Black are some of my all time favorites

Annette Fishman

I'm a freshman and I am looking forward to talking and meeting new people :) I'm excited for dorm life (if that ever happens), finding cute secluded study spots on campus, coffee shops, cafes, etc. I can't wait to workout at the UCLA gym and attend my classes in person. Just a few out of so many thi...

Annette Fishman

Even Socal is experiencing unwarranted power outages :/ I would just try to communicate with your professors before if you can, or provide an explanation afterwards to accommodate for makeups. Wishing you good luck!!!

Annette Fishman

I struggle with this as well. With balancing work for 20-25 hours a week, to spending time with my family, friends, and s/o, as well as attending all of the lectures and completing homework on time is extremely difficult and I'd be lying if I told you I had it all figured out (lol its 1:30 am). My b...

Annette Fishman

The post will count for Week 7. The cutoff is Sunday 11:59 pm!

Annette Fishman

I love salt and vinegar chips. Sushi will always be my favorite food. Banana bread, mint chocolate chip icecream, smoothies, jasmine boba. All are some of my favorite snacks and foods :)

Annette Fishman

You can't review it on your own, but if you go to a scheduled TA office hours they can verbally tell you which ones you got wrong and the correct answer!

Annette Fishman

Based on Chem 14A, all exams are proctored very similarly and have the same protocol. TA discussion group with camera pointed to your hands, test on Respondus lockdown broswser.

Annette Fishman

As a response to my own post, I am taking LS7A, Ling 1, and Engcomp 3D. Not even close to my ideal schedule, but with my morning pass and UCLA's lack of uploading enough classes for all students - this will have to do. Linguistics fills a GE and the Engcomp fills the Writing I requirement. I wanted ...

Annette Fishman

I wouldn't worry too much! As of right now, I can see all of my previous grades, but I think there's nothing wrong. I would check again though

Annette Fishman

I am planning to take BL separate from Chem C, and I had a lot of difficulty with closed classed or final overlap.

Annette Fishman

I watch lectures on 1.25 or 1.5 speed, and while Lavelle is going through a slide, I try to understand what he's saying. After he's done, I copy that slide down with some additional notes and continue that for the rest of his lecture. It can be time consuming, but I think it helps you grasp the mate...

Annette Fishman

What classes are you guys enrolling in for Spring quarter?

Annette Fishman

This really resonates with me. I work two jobs back to back right after my classes, and come home most days at 10 pm when I finish. I also try to make time to hang out with my boyfriend and my best friend and my family, and up until last week I was managing, but now I have a huge pile of workload th...

Annette Fishman

In Chem 14A, TA's would offer office hours to tell you which problems you got wrong. They don't show the question, but they explain the right answer

Annette Fishman

Thank you Dr. Lavelle! So many support systems along with chemistry community to help answer questions when feeling lost.

Annette Fishman

I feel like the content was more or less expected. Some questions were worded a bit weird, and it took me a little bit to understand what was being asked of me. I did rush the last three questions, but I don't feel super defeated post midterm.

Annette Fishman

Once you download it through CCLE, it should open up automatically!

Annette Fishman

I prefer watching the lectures as he posts them (not falling super behind) as well as keeping up with the Sapling. Reading the textbook is also super helpful because it clarifies ideas that sometimes the lectures don't go into. I don't always do the textbook problems, but they do show up on the exam...

Annette Fishman

He sent an email saying that they would be out by tonight!

Annette Fishman

Now moved to the end of Week 5!

Annette Fishman

I went thrifting and then I had a sleepover with my best friend :) We went to go get some bomb sushi, made chocolate covered strawberries, listened to good music, and just had a good time. Love the positivity

Annette Fishman

Watch lectures on time when they're posted. Understand Sapling. Textbook problems when you can. Reading the textbook is also very helpful to me. I never attend office hours but they seem to be helpful too.

Annette Fishman

Hess's Law of Constant Heat Summation states that regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes. This law is a manifestation that enthalpy is a state function.

Annette Fishman

I think the balance between work, school, and social interactions is very very difficult to manage. I am definitely not the representation of a perfect balance, but I normally try to watch the lectures the day Lavelle posts them (and for all my other classes to stay on top of lectures and go to ever...

Annette Fishman

I think it was more tedious and I felt like I was running out of time by the end of the test. I know it would've been better if I had done all of the textbook problems, but I didn't get to all. Overall, Lavelle and the textbook did a good job in preparing me.

Annette Fishman

If the K value is less than 1.0 x 10^-3, then the x can be dropped. Lavelle prefers we drop it at 1.0 x 10^-4 to be more safe, but essentially its when the K value is so small it doesn't affect the overall concentration.

Annette Fishman

I've been super all over the place lately. Kanye West, The Weeknd, Kid Cudi, Tyler the Creator, Lana del Rey, Frank Ocean, PATD, Fall Out Boy. Anything that hits in that specific moment in time.

Annette Fishman

Any Disney classic. The Parent Trap is a great movie. CAMP ROCK! These immediately take me back.

Annette Fishman

Same as last quarter, the TAs would probably want us to join 5-10 minutes early to set up, check papers, and get everybody situated. Then, once you open up Respondus and click the timer, the 50 minutes is the time limit in which you can take the test.

Annette Fishman

The ICE box is used to find unknown concentrations at equilibrium or initial given the concentration of one of the reactants or products.

Annette Fishman

Be more easy on myself. That being said, try to wakeup early everyday. Stay on top of my lectures, zoom calls. Maintain my time a bit better with a planner. Bike at least four times a week. Work hard, play hard :)

Annette Fishman

These both can be used interchangeably! It is important to note that no reaction actually "shifts". According to Le Chatelier, the position of equilibrium will move in such a way as to counteract the change.

Annette Fishman

Sapling homework is mandatory. So the week 1 assignment for sapling is DUE the Sunday of week 2. All of the problems from the textbook are optional, and normally are extra practice plus they commonly show up on midterms and final exams.

Annette Fishman

Make sure to log in to Sapling through CCLE. Once you're there, click "use credit" and then it should work.

Annette Fishman

I've run into this problem when completing the Sapling, but even though they are both positive, both shouldn't make sense in the context of the problem. Some people above have noticed that the correct x value is commonly the smaller one. To be sure, though, it is necessary to check for yourself.

Annette Fishman

It is also important to note this relationship between Q and K. Q is a quantity that changes as a reaction system approaches equilibrium. K is the numerical value of Q at the "end" of the reaction, when equilibrium is reached. If Q is less than K the reaction will shift right If Q is great...

Annette Fishman

All these phrases mean the same thing. You have to take into consideration too that nothing in the chemical reaction is actually "shifting", that is just simply the terminology.

Annette Fishman

In my opinion, watching lectures on the day they come out is the way to go. At one point, I was behind on fourteen lectures for a midterm, and it is almost impossible cramming that much. Asynchronous classes make it very easy to procrastinate, but promise me it will be way easier to follow along as ...

Annette Fishman

In this class, R is 8.314 J·K^-1·mol^-1. It can be found on the formula sheet on Lavelle's website.

Annette Fishman

Lavelle lectures are pre-recorded and posted on their assigned date (every other day of the week). You must keep yourself accountable to watch these. Discussion sections are optional, but they are helpful as you can ask any question you need. Sapling is mandatory homework you are graded on. Hope thi...

Annette Fishman

Sapling is mandatory homework, due dates are posted on there too. Textbook problems are optional and given as additional help if needed (they show up on exams sometimes)

Annette Fishman

It becomes way easier when you draw the molecule and draw out the vectors to signify the dipoles! If they cancel out, the molecule is nonpolar.

Annette Fishman

FC = valence electrons - number of dots - number of bonds/lines.

Annette Fishman

First step is to draw the Lewis diagram to visualize the atom. Bond angle is determined by examining the number of lone pair electrons. This is because there is election repulsion, causing the bond angles to be slightly smaller. And as Lavelle said, we don't have to memorize these changes in angles,...

Annette Fishman

December 6 - 45
December 13 - 50 posts total

Annette Fishman

Polar molecules occur when there is an electronegativity difference between the bonded atoms, whereas nonpolar molecules occur when electrons are shared equal between atoms of a diatomic molecule or when polar bonds in a larger molecule cancel each other out.

Annette Fishman

Rotation around a single bond occurs readily, while rotation around a double bond is restricted. The pi bond prevents rotation because of the electron overlap both above and below the plane of the atoms.

Annette Fishman

I believe that it will be mostly the same. We will continue to use Sapling. I think the textbook we bought was for both classes, so just an continuation.

Annette Fishman

An oxidation state is the total number of electrons that an atom either gains or loses in order to form a chemical bond with another atom. :)

Annette Fishman

Honestly, overwhelmed. On top of UCLA classes, I am working a job that I go to right after I finish my classes. I close almost everyday, so I come home at 10:30. I just always feel like I have absolutely no time for anything, and December is one of those months that keep me up all night. Scared for ...

Annette Fishman

40. has 2 sig figs while 40 only has one! All above answers are correct :)

Annette Fishman

I think the textbook is extremely helpful in clearing up topics that weren't clearly defined in lectures. Plus, lectures are super long and have a ton of information, while the book condenses it. It is way easier to follow in my opinion!

Annette Fishman

The type of bond doesn't affect molecular geometry. However, it might change the angle between the elements (as double bonds are tighter etc), but when asked, we don't take this into account. You can think about it that way conceptually, but it doesn't change the actual answer!

Annette Fishman

Best advice is to count the electrons first in order to fill the octets for all the atoms (as they are most stable that way).

Annette Fishman

I feel relatively okay in this class - tons of resources, great textbook, descriptive videos. The only issue with me is that I constantly fall behind on lectures and have to do a ton of catching up. First midterm was good, but my second I didn't perform my best. So I am a little anxious about the fi...

Annette Fishman

Molecules are read left to right to be given the order!

Annette Fishman

Molecules are read left to right to be given the order!

Annette Fishman

A bond is polar because two atoms have different electronegativities. However, when these two atoms (or more) are symmetric and have zero lone pairs, this indicates that this molecule has linear geometry. The bonds are symmetric, so their dipoles cancel out. Thus, the molecule is nonpolar. On the ot...

Annette Fishman

Best bet is to memorize them. We will continue to draw molecules and will have to know what they look like to look at its chemical properties. Luckily, its not that much and is typically straightforward once you get the hang of it.

Annette Fishman

I look at electronegativity and the presence of lone pairs in the Lewis structure. It is extremely helpful to also draw the atom and indicate all the lone pairs. If the molecule is asymmetrical with bonding, electrons, etc, then it is always non-polar because that means that one side is slightly mor...

Annette Fishman

Counting the valence electrons is the first step, make sure to account for the cations/anions. Next, I write the most electronegative atom in the middle and draw bonds to make sure it has an octet (or lone pairs). I tend to use trial and error, but after practice you know how to draw basic atoms and...

Annette Fishman

I have the same struggle, especially this quarter. I make sure to use an agenda, because I find satisfaction in crossing of assignments that I have completed. I also try to make sure my work environment is clean (as well as my room). Sometimes I facetime my friends and we both do homework at the sam...

Annette Fishman

The London dispersion force is the weakest intermolecular force. The London dispersion force is a temporary attractive force that results when the electrons in two atoms occupy positions that make the atoms form temporary dipoles.

Annette Fishman

The formal charge of an atom in a molecule is the hypothetical charge the atom would have if we could redistribute the electrons in the bonds evenly between the atoms. The smallest formal charge is most favorable because it is considered to be the most stable.

Annette Fishman

Instructions should be clear, but if not, least formal charge is the way to go. It is the most accurate, but I'd make sure to recognize multiple structures in case.

Annette Fishman

I go biking on my free time around my neighborhood when I can. Sometimes, I go on the trampoline or just take a walk. All of these help me clear my mind and relax a little bit

Annette Fishman

Yes, I am always super anxious about my grades, and sometimes I feel super disconnected from UCLA so it gets hard to learn. These past few weeks have been back to back midterms so I haven't had as much time to study as for the first midterm, which means cramming for me til Tuesday morning. But just ...

Annette Fishman

The energy levels that are lowest are filled up first. Based on experimental data, it was found that the 4S shell has less energy than the 3D shell, so that's why it is filled up first. So, when writing out the electron configuration, you must keep this in mind or you will get the answer incorrect.

Annette Fishman

A radical is a molecule that contains at least one unpaired electron. In organic chemistry, it is more specified that radical stability increases in the order methyl < primary < secondary < tertiary, but I'm not sure how much of this we actually need to know. The stability of radicals on the carbon ...

Annette Fishman

Coulomb's law describes the force between two charged particles. This Coulomb force is extremely basic, since most charges are due to point-like particles. It is responsible for all electrostatic effects and underlies most macroscopic forces. This equation is given by F(e)=(kQ1Q2)/r^2 (unit in Newto...

Annette Fishman

I take a few deep breaths. I get less anxious when I know that I studied to my fullest potential, so it puts me in the mindset that I am going to try my BEST. When I start my test and am unable to do the first few questions that makes me more stressed out. So I either take it slow or take the test b...

Annette Fishman

Breaking Bad, Orange is the New Black, How to get Away with Murder, Euphoria! some of my favorites

Annette Fishman

The energy levels that are lowest are filled up first. Based on experimental data, it was found that the 4S shell has less energy than the 3D shell, so that's why it is filled up first.

Annette Fishman

Sapling homework is due at 12:59 midnight on Sundays! He also uploaded the new Sapling for week 5 and 6, so it is due next Sunday night. Hope that helps!

Annette Fishman

The trends for ionization energy and electronegativity are the same. They increase in electronegativity/ionization energy as you go across a row and up a column. Fluorine is the most electronegative element. This is because for ionization energy, or the energy to remove an electron, the elements wit...

Annette Fishman

I would love to be a part of it! My email is anfishm@gmail.com :)

Annette Fishman

I was confused on this one as well, but I realized that the waves must be continuous. So as Juliana mentioned above, picture the image of the wave side by side, and if its continuous, then you know that the wave is compatible.

Annette Fishman

Yes, you should multiply your coefficients by the same number in order to get whole ratios. That number should be the smallest coefficient possible, or you'll need to simplify. For example, if the coefficient is 1.5, you'd want to multiply by 2. If 3.33, multiply by 3. When you put it in fraction fo...

Annette Fishman

Happy Halloween!! I went to a very small Halloween "get-together" where I watched scary movies and ate candy :)

Annette Fishman

I'm pretty sure Professor Lavelle sent out an email regarding the webcam and all of its nuances later in Week 2. Additionally, there's an entire page on Chemistry Community answering a ton of those questions. My TA told my session that a cell phone would be okay as well!

Annette Fishman

As mentioned above, Lavelle said the MT covers up to 1.D.2 in the textbook and to Week 3 Wednesday lecture. Quantum numbers, s, p, d-orbitals, etc., are not on MT 1.

Annette Fishman

Like everybody has mentioned above, it's your call. They aren't collected, but they help you prepare for exams and the coming up midterm. If you look at the syllabus, there are multiple practice problems Professor Lavelle recommended. Whatever feels best for you!

Annette Fishman

In the Rydberg equation, n1 represents the lower energy level and the n2 value represents the higher energy level. n2 has to be greater than n1 (positive results)

Annette Fishman

Studying is subjective and depends on how you work best personally. For me, I watch the lectures while taking notes to highlight key points. I also do the Sapling along with homework problems if I need additional help understanding a concept. Reading the textbook as well!! Use a planner or calendar ...

Annette Fishman

Thank you!!!!

Annette Fishman

I ordered my Sapling textbook with the shipping option about a week before school started, and I received it in the middle of the second week of school. I kept checking the UCLA bookstore site for when the status of the book switched from "processing" to "shipping". They also sen...

Annette Fishman

Equations should generally be given to us, but for our future in chemistry, it is best to start becoming familiar as well as memorizing them.

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