CHEMISTRY COMMUNITY

Arti_Patel_3H

Thank you so much, this is really helpful!

Arti_Patel_3H

I was really struggling with this on the Sapling, but I found a kind of shortcut for it:
1. balance whatever is getting oxidized/reduced
2. add double the amount of OH- needed to balance the oxygen
3. add as much H2O on the other side of the equation as you need to balance the hydrogen

Arti_Patel_3H

I believe he will be posting it by Wednesday

Arti_Patel_3H

I'm in AIM and it's been a lot of fun so far :)

Arti_Patel_3H

I will be relaxing as much as possible. I'm hoping it'll be warm so I can go to the beach!

Arti_Patel_3H

I'm taking CHEM14C, LS30B, and NR EAST65

Arti_Patel_3H

I try to position myself so i'm staring at a white or plain wall instead of getting distracted by the other objects in the room.

Arti_Patel_3H

pasta, I love pasta any day, any time!

Arti_Patel_3H

I've been watching FRIENDS and making a lot of smoothies :)

Arti_Patel_3H

I recommend anthro 1 and mcdb 60 (i'm not sure if they're open still)

Arti_Patel_3H

Kaleb Tuliau 3E wrote:so it is cumulative?

Yes, it is cumulative.

Arti_Patel_3H

I agree with what everyone has been saying. Saving a spot for yourself right now is the best option.

Arti_Patel_3H

Congrats everyone! Hope your weekend was fun :)

Arti_Patel_3H

Aw this is so wholesome! Happy Valentine's day everyone!

Arti_Patel_3H

I actually converted my deltag to J/mol instead of converting the ideal gas constant to kj and that worked for me. I hope this helps!

Arti_Patel_3H

I'm also struggling and honestly, I find it most difficult to start studying for this class. I've recently been spreading out my studying and trying to stay on a schedule so that I'm not super overwhelmed. I hope it gets better!

Arti_Patel_3H

I made the mistake of not completing the homework problems last time so I will definitely be completing them before Friday. I also go to Kate's workshop every week and try to go to either Matthew's or Justin's.

Arti_Patel_3H

I'm currently watching Criminal Minds!

Arti_Patel_3H

I agree, I was having the same problem but putting it into scientific notation worked for me :)

Arti_Patel_3H

I'm probably going to do Chem 14C, LS30B, and a GE :)

Arti_Patel_3H

I usually go to step up sessions and workshops, especially if I don't understand the lectures very much lol.

Arti_Patel_3H

Because the system is at constant volume, we can assume that deltaU is equal to q. Your answer should be the same for both parts.

Arti_Patel_3H

You were given the value of Cp, so you have to use the equation deltaU = nCvdeltaT. To get the value of Cv, use Cv = Cp - R. Then, plug this value into the deltaU = nCvdeltaT. Hope this helps!

Arti_Patel_3H

You have to find the moles of NaN₃ and then multiply that by (3 moles N₂/ 2 moles NaN₃). This gives you moles of N₂ which you can plug in for n in the PV=nRT equation.

Arti_Patel_3H

Sometimes, UAs do start their sessions late but this week, Kate's workshop on Thursday night was pushed back to 8-10pm because she had a prior engagement. I use this link for UA sessions https://lavelle.chem.ucla.edu/wp-conten ... PL_ALL.pdf. Hope this helps!

Arti_Patel_3H

For this question, it's asking for q first so you need the equation q=nCpdeltaT (you should be given the value of Cp). To solve for deltaU, you have the equation deltaU=nCvdeltaT. You can derive Cv from Cp using the equation Cv=Cp-R.

Arti_Patel_3H

Anusha Chaudhary 1J wrote:Hi! Does anyone know by when we usually get our midterm scores? Thanks!

Last quarter it was within a week of when we took the midterm. I think it'll be the same this quarter :)

Arti_Patel_3H

I listen to happy/feel-good music mostly like Khalid, Finneas, Lauv, Harry Styles, etc.

Arti_Patel_3H

Congratulations everyone! We got this!

Arti_Patel_3H

He hasn't, but last quarter they were typically out within a week.

Arti_Patel_3H

I totally understand how you feel. I've been struggling just like everyone else has. After all this time of Zoom classes and video lectures, I've found that taking a small walk outside 2-3 times a day. I've also started to read books more (I try to read one new book every month), working out, and pa...

Arti_Patel_3H

In 14A, Dr. Lavelle would tell us the number of questions on the midterm before it was administered which helped me with timing, but I'm not sure if he still will.

Arti_Patel_3H

Kaleb Tuliau 3E wrote:How many questions does the midterm usually have?

For 14A, the number of midterm questions was 10-15 and each question was worth 6-7 points (if I remember correctly lol).

Arti_Patel_3H

The UA sessions helped me a lot (especially going to them during the week before an exam). They go over the content that we will be tested on and some of the UAs give us previous test questions and go through them step by step which is SUPER helpful.

Arti_Patel_3H

Most of the UAs will probably spend most of their session time on review and the rest of the time covering week 4 content.

Arti_Patel_3H

I felt like 14A problems were more like the textbook problems. They definitely give you a stronger foundation than the Sapling problems do. Hope this helps :)

Arti_Patel_3H

I agree with what was already said. I had trouble with this question as well. Make sure to add up your pressures to find the total pressure at the end.

Arti_Patel_3H

Although most of the time Sapling is due every other week, it seems like Dr. Lavelle changed it a little this quarter because we have homework due for two consecutive weeks. I assume this is because of the amount of content we have learned so far.

Arti_Patel_3H

The way I did it was K equation for all of the chemical formulas (including the initial formula we were given). Then, I tried to figure out how I could use two of the 4 chemical equations we were given to form the initial equation. I determined that Ka and Kc would be most ideal and then I multiplie...

Arti_Patel_3H

In order to solve for x, I find it easiest to take the square root of the whole equation when possible. It should allow you to solve for x easily because it will become a quadratic equation.

Arti_Patel_3H

You need to use the 1st and 3rd equations because these equations can be manipulated to form the initial equation. You need to do 1 over the K of the first equation and raise it to the power of 3 since 3 of the inverse of first equation form one part of the initial equation. For the third equation,...

Arti_Patel_3H

I recommend forming a study group in order to keep each other accountable!

Arti_Patel_3H

I think it means we should recognize that ATP hydrolysis and osmotic pressure in the body utilize chemical equilibrium. We may have an exam question later on that incorporates these biological concepts.

Arti_Patel_3H

I agree with everyone above, but I think you should also just go over the outlines before every exam and make sure you know every concept. If you're confused about something specific, I recommend watching a Youtube video or two on the topic for clarification.

Arti_Patel_3H

My comfort movies include any Shrek movie (which is ahead of its time) and anything with either Will Ferrell (Megamind/Step Brothers) in it or Adam Sandler for a funny movie. For TV shows I'm currently binging on New Girl. I'm also binging on New Girl right now! For comfort movies, I like watching ...

Arti_Patel_3H

You should definitely be going to step-up sessions, workshops, and Dr. Lavelle's office hours, but I also recommend doing the homework problems for every outline. I did pretty well on the midterms last quarter, but I definitely underestimated the difficulty of the final, so don't do that.

Arti_Patel_3H

Although section is not mandatory, it does help me understand the material a lot more. I recommend asking your TA for the slides if you can't make it to a section.

Arti_Patel_3H

Naomi Hernandez-Ramirez 1J wrote:(Took Chem 14A w/ Scerri) Do any of you have the lockdown browser, Respondus, download link or know where I can find it?

https://download.respondus.com/lockdown ... =228644488 this is the link I used to download Respondus for Lavelle last quarter

Arti_Patel_3H

Focus more on my mental and physical health

Arti_Patel_3H

Focus more on my mental and physical health

Arti_Patel_3H

I had this problem as well but I found that the most helpful things were the UA sessions, doing the homework problems, and my organic chemistry tutor on Youtube. I'll definitely be going to a lot more UA sessions and doing the homework problems for every outline.

Arti_Patel_3H

Good luck everyone! We got this :)

Arti_Patel_3H

claire ikemiya_2I wrote:Is the course evaluation the one we were emailed, or can it be found somewhere else?

It can also be found on myUCLA --> classes --> evaluation of instruction.

Arti_Patel_3H

I also heard that there will be other proctors and we will be put into breakout rooms.

Arti_Patel_3H

I agree with Vincent. I think only some of the questions will be from the textbook and most are going to be testing us on concepts.

Arti_Patel_3H

Hi in a session I went to, the UA said that there was a surprising amount of acid-base questions on the final when they took it.

Arti_Patel_3H

I just finished lecture 29 and it worked perfectly for me (I'm using Google Chrome). I hope you were able to watch them :)

Arti_Patel_3H

almost_ethan wrote:Does anyone know how many questions are going to be on the final?

I heard it was 30.

Arti_Patel_3H

I'm going to bake as much as I can and try to have a good holiday season despite COVID.

Arti_Patel_3H

Ravdeep Warar 2G wrote:Dr. Lavelle hasn't said anything about us getting points or extra credit for completing the UCLA course evaluations or the Sapling evaluation.

What is the Sapling evaluation?

Arti_Patel_3H

Hi! One thing that I've noticed is that the UA sessions help me a lot more than I anticipated. The worksheets are great resources and the UAs explain the problems very well.

Arti_Patel_3H

I'm planning to go over all the discussion sheets I did when I was studying for the two midterms to review/solidify the topics and then I'm going to spend most of my time doing textbook problems pertaining to the topics we covered in the last few weeks. I'll also attend as many Final Review workshop...

Arti_Patel_3H

I think the best way to practice would be the textbook problems because they are the most similar to the two midterms.

Arti_Patel_3H

Darren1e wrote:I've heard people say its good to take it with chem 14c. Would anyone recommend taking it over the summer or would taking it during the year be better?

I asked a friend about this and they said it would be better to take it during the year if you plan on taking both 14bl and 14c simultaneously.

Arti_Patel_3H

Here's how I understand them: double and triple bonds have pi bonds. Molecules with resonance mean that they do not have a complete double/triple bond(s). This also means that these resonance structures have delocalized pi bonds.

Arti_Patel_3H

I believe that Dr. Lavelle said in one of the lectures that we only need to know the names of possible shapes for each number of bonds, but I'm not sure.

Arti_Patel_3H

Like other people have said, I will be doing some more book problems and going over my notes on all the material. I'm also going to as many UA sessions as I can.

Arti_Patel_3H

I thought the material up until week 7 was pretty manageable, but week 8 was kind of difficult for me to understand, so I'm getting nervous about the final.

Arti_Patel_3H

Stacey Phan 3I wrote:I believe Professor Lavelle just regarded them as regions of electron density which is the only thing considered in determining shapes.

This is what I interpreted from the lecture as well.

Arti_Patel_3H

I found that the more I did practice problems (UA worksheets, textbook problems, etc.), the more I felt comfortable with the material. I'm nervous about the final, but I think that annotating my notes and attending as many workshops and step-up sessions from now to then will help me be more confiden...

Arti_Patel_3H

I only use Sulfur (S), Argon (Ar), Calcium (Ca), and Samarium (Sm) [SArCaSm] periodically.

Arti_Patel_3H

Shanna Yu 3F wrote:Hi!

Someone can correct me if I'm wrong, but I believe combustion problems typically operate under the assumption that oxygen is in excess unless it's stated otherwise.

You're correct. Usually, it is assumed there is an excess of O2 in combustion reactions.

Arti_Patel_3H

Whenever I get overwhelmed with school and bored of staring at my laptop, I go for a walk usually to the park.

Arti_Patel_3H

Arti_Patel_3H

I know that 14B was asynchronous for this quarter so I'd assume it will be for next quarter as well.

Arti_Patel_3H

I think the Friday lecture is cancelled, but I'm not sure about discussion sections.

Arti_Patel_3H

I went by that parameter - the structure with the least number of formal charges - and I got the answers right on Sapling.

Arti_Patel_3H

The reason option a cannot be a hydrogen bond is that the H in the acetone molecule does not have a slightly polar charge. That H is bonded to a C, which makes that bond a dispersion force. However, the O in the acetone molecule of option c does have a slightly polar charge, attracting the slightly ...

Arti_Patel_3H

For hydrogen bonds, it's between hydrogen and fluorine, oxygen, or nitrogen. London (dispersion) forces are present between all molecules. You can tell if a bond is covalent or ionic using the electronegativity chart that Dr. Lavelle showed us during lecture.

Arti_Patel_3H

Good luck everyone! Stay positive, happy & safe!

Arti_Patel_3H

My TA said it will be formatted the same way in terms of zoom and Respondus running at the same time. I know that the questions will be more conceptual rather than asking us to calculations like in midterm 1.

Arti_Patel_3H

The step-up sessions and workshops helped me the most for Midterm 1.

Arti_Patel_3H

I think it would help me with the next midterm and final to be able to see the solutions, but I also heard that we won't be able to.

Arti_Patel_3H

I usually listen to music when I study, but I found that with chemistry, it was easier for me to focus on the lectures and the homework when my music wasn't playing.

Arti_Patel_3H

I've been worried about my grade as well. I think as long as you study as much as you can and attend step-up sessions/workshops for clarification, you should do well on the next midterm and the final.

Arti_Patel_3H

I found that the drop-in sessions were much more helpful because I was able to get clear answers to my questions and clarification right away.

Arti_Patel_3H

Hi! I spent the day pranking my parents! I put up scary decorations all over my house (fake [censored] handprints and footprints, skeleton ghosts, etc.). Then, we had a Halloweentown marathon :)

Arti_Patel_3H

I watch Disney+ when I feel overwhelmed :)

Arti_Patel_3H

If you're confused about Rydberg's, know that if the photon is emitted, n (initial) should be greater than n (final). If the photon is absorbed, it is the opposite.

Arti_Patel_3H

It depends on whether light was emitted or absorbed. If absorbed, n1 (initial) would be a lower number than n2 (final). If emitted, n1 would be a greater number than n2.

Arti_Patel_3H

Whether you are asking a question or answering one, I believe that any post will give you a point.

Arti_Patel_3H

I did the practice problems as well. I think they helped a lot more than I anticipated, but if you haven't yet, I recommend going over your lecture notes to re-familiarize yourself with how to solve the easier problems because the practice problems are more complex.

Arti_Patel_3H

I agree, it's probably a rounding error. Also, make sure you're using parentheses when you're solving for the work function because depending on what calculator you're using, the numbers may be slightly off.

Arti_Patel_3H

Mingzi Yang 1H wrote:I thought we have to have a scientific calculator??? So we don't have a restriction on the type of calculator we use??

No, we don't. My TA also said we can use any calculator.

Arti_Patel_3H

The only problems we have done so far with Heisenberg's indeterminacy is to solve for velocity, so I'd assume that we would only be tested on this during the midterm.

Arti_Patel_3H

Personally, the UA sessions have been very helpful. I have also been going over the more difficult textbook problems once on my own and another time with a small study group which helped me understand the content.

Arti_Patel_3H

Here is a link to all the step-up sessions: https://lavelle.chem.ucla.edu/wp-conten ... PL_ALL.pdf
One of the UAs will be teaching the step-up session and they usually just work through problems, step by step, relating to the week's topics.

Arti_Patel_3H

It depends on your TA. Because we take the midterms during our discussion sessions, the TAs are monitoring us, so your TA will probably be able to answer this question.

Arti_Patel_3H

From what I've heard, it depends on your TA because they're the ones proctoring all the exams.

Arti_Patel_3H

The audio-visual focus topic questions are the most helpful for me. I also rewrite my notes to make sure I understand the content again.

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