CHEMISTRY COMMUNITY

StephanieGrigorian2J

Thank you so much Dr. Lavelle! I've been with you for two quarters and I have to say I wish this was an in person class so I could actually vibe when you play music before class! Seeing the smile on your face while watching lecture makes my day. You are an incredible educator and you've taught us al...

StephanieGrigorian2J

Good luck guys! We almost made it through the whole quarter and I'm proud of us :)

StephanieGrigorian2J

I believe all cell phones automatically change the time and the alarm will wake you up at the time you set it at regardless of the hour difference.

StephanieGrigorian2J

I believe little decimal points like that should be rounded! But in terms of the final I don't think he will curve because he didn't last quarter.

StephanieGrigorian2J

Thank you so much! Hopefully all this work pays off! Good luck to everyone! :)

StephanieGrigorian2J

Also don't forget that daylight savings is on Sunday the 14th which is our final day! I believe we lose an hour.

StephanieGrigorian2J

I don't think there is going to be a final exam study guide but there are many hours of review sessions during week 10.

StephanieGrigorian2J

I genuinely miss just walking to class and seeing other people doing the same. I miss dorming A LOT too and just studying with other people in the room because I'm more productive that way. I'm also really looking forward to spring break since my birthday falls during that week!

StephanieGrigorian2J

I handwrite my notes because I feel like it's easier and that I retain more information this way :)

StephanieGrigorian2J

I generally just convince myself that we're almost done with the quarter and try to just take a day to myself to try and deal with burnout!

StephanieGrigorian2J

Studying for Midterm 2 and all the upcoming finals is definitely gonna have me stressed and my only motivation is every Friday for WandaVision. I'm a Marvel junkie and this is my only serotonin after Endgame. Can't wait for the upcoming Falcon/Bucky and Loki series!

StephanieGrigorian2J

I'm a part of the UCLA SPOT club on campus, it's a pre-PT group :)

StephanieGrigorian2J

I did surprisingly well on Midterm 2 but I'm just worried about the final since I'm struggling a bit with electrochemistry.

StephanieGrigorian2J

New Girl is also something super fun to sit down and binge!

StephanieGrigorian2J

Saffron & Rose ice cream is a really good dessert spot on Westwood Blvd!

StephanieGrigorian2J

ok don't come at me for this but heirloom tomatoes and some burrata. Honestly any cheese+tomato combo slaps. I also highly recommend the feta-pasta thing all over tik tok, SO GOOD I've been wanting to try this omg. Some people make it look really good and some just doesn't look good at all so I'm t...

StephanieGrigorian2J

Hi! I definitely know what you're talking about because I work 20 hours a week and it SUCKS. I'm especially worried for next quarter where I'm taking 5 classes so I'm going to try to cut back to 15 hours a week and hopefully it will help. It does get difficult to stay on top of things but I try to h...

StephanieGrigorian2J

Thank you so much! I was kinda having a little trouble with it and this helped!

StephanieGrigorian2J

Yay! I'm looking forward to a fun day tomorrow that's long over due!

StephanieGrigorian2J

I love sushi and any pasta!

StephanieGrigorian2J

I read it too and didn't see anything that said how many questions there would be. I was specifically looking for how many questions there would be and didn't see it. I only saw that there would be questions worth 4 and 8 points.

StephanieGrigorian2J

That was so cute! Happy Valentines Day to everyone! <3

StephanieGrigorian2J

I'm almost finished with New Girl :)

StephanieGrigorian2J

I definitely find myself having the same problem. I also work a lot so finding time for myself while trying to study and do well on exams is difficult! I'm still trying to find time to relax and figure it out!

StephanieGrigorian2J

I'm trying to enroll in Chem 14BL, LS23L, and LS 110 along with 2 other psych courses.

StephanieGrigorian2J

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 t...

StephanieGrigorian2J

Thank you so much guys!

StephanieGrigorian2J

This gave me a different perspective wow! Thank you for sharing this :)

StephanieGrigorian2J

I was also feeling confident going into the exam but it was much harder than expected and I'm not happy with the results. I know the next one is going to be even harder too :(

StephanieGrigorian2J

Hi guys! Can anyone help with the last part of this question? I was able to do the first 2 parts but can't seem to figure out the last one.
Calculate the amount of CS2 (in grams) produced when 379 kJ of heat is absorbed.

StephanieGrigorian2J

Okay thank you so much guys!

StephanieGrigorian2J

Last quarter there was no curve unfortunately so I would be very surprised if he did decide to curve the midterm.

StephanieGrigorian2J

Professor sent out an email that the scores should be released late Wednesday (2/3).

StephanieGrigorian2J

After the midterm I didn't really have time to relax because I have another midterm on Tuesday :/ but hopefully I can take a break soon because I also work like crazy!

StephanieGrigorian2J

Dr. Lavelle changed the due date to Sunday of week 5 so you should be fine and be able to complete it.

StephanieGrigorian2J

What happens if we miss a week of chemistry community posts? Is there a way to make it up like last quarter?

StephanieGrigorian2J

I don't think we would have to memorize any values like that. I think they would be given on the exam.

StephanieGrigorian2J

Hi! For this problem I got the correct initial value of amine but I couldn't figure out the percentage of amine protonated. My main question is why do we have to add [BH+] and [B]? It also says in the solution that the formal concentration of B is the sum of the concentrations B and BH+. Can someone...

StephanieGrigorian2J

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 :)

StephanieGrigorian2J

I'm also very confused on this problem! I was confused on how they generated the 3 equations in the answer key in order to get to the answer. It looks like they took each reactant/product and added oxygen in order to get carbon dioxide and water as a product? Can someone further explain this?

StephanieGrigorian2J

I would recommend starting by first arranging the reactions given in a way that will leave you with N2O5, dinitrogen pentoxide. To do this, we have to multiply 2 NO(g) + O2(g) --> 2 NO2(g) H°= -114.1 kJ by 2 so that the NO2 (g) will cancel. This leaves us with 4 NO(g) + 2O2(g) --> 4 NO2(g) H°= 4(-1...

StephanieGrigorian2J

Na: "That was sodium funny!"
Ne: "I slapped my neon that one"

StephanieGrigorian2J

In addition to everything, I would also read the textbook and make brief study guides just so I can understand the conceptual stuff for the exams!

StephanieGrigorian2J

Hi! I think I know what you are talking about. So in most situations, the reactants will be subtracted from (-x) because it is losing whatever amount to form the product and the product will be addition due to gaining/forming. The instance in which the reactants and Products switch signs could be d...

StephanieGrigorian2J

Hi! I'm having a little trouble with the change in molarity portion of the ICE table. On most examples we do in lecture and the textbook, the change is usually -x or -2x for the reactants side, but sometimes I encounter a +x or +2x on the reactants side on the textbook problems and Sapling homework....

StephanieGrigorian2J

I had this same issue! I was using Safari as my browser but then I used Chrome and it worked!

StephanieGrigorian2J

I believe the most common unit for P that we are going to use is atm/bar.
V = Liters
n = moles
R = J.K.mol, L.atm.K.mol, L.bar.K.mol, L.Torr.K.mol
T = Kelvin

StephanieGrigorian2J

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.

StephanieGrigorian2J

Correct me if I'm wrong, but I believe that Kc is just a more specific way to describe K. However, if you want to convert between Kc and Kp, then I think the equation is Kp= Kc(RT)^delta(n), where delta n is the change in the number of moles (moles of products - moles of reactants). So calculating ...

StephanieGrigorian2J

Can someone explain how to convert between K and Kc? This was mentioned in the textbook and I'm confused on how to do this/what this means.

StephanieGrigorian2J

It looks like it should be the same but since its less points compared to 14A it might be less questions that are just worth a little more.

StephanieGrigorian2J

I'm going to Big Bear to ski and finally get some runs in right after finals are over! And I'm basically going to be working for most of those two weeks so not really any relaxing time to myself unfortunately :/

StephanieGrigorian2J

A monodentate will bind at only one site (donating one electron pair as it binds) while a bidentate will bind at two sites (donating two electron pairs as it binds). tridentate = 3 sites hexadentate = 6 sites Keep in mind that bidentate, tridentate, and hexadentate ligands are also chelating ligands...

StephanieGrigorian2J

I think you're referring to the experiment that showed diffraction patterns, that light can act like a wave by constructive and deconstructive interference.

StephanieGrigorian2J

Strong bases fully protonate, meaning almost all the basic molecules in the solution gain a proton. Strong acids fully deprotonate, meaning almost all acidic molecules (all molecules of HCL for example) lose their hydrogen atoms. Weak acids and bases incompletely deprotonate and protonate, meaning t...

StephanieGrigorian2J

^^ I use the same! It has no lyrics and its just relaxing music and it really helps me stay focused.

StephanieGrigorian2J

I blew up my chemistry experiment.
Oxidants happen.

StephanieGrigorian2J

I'm assuming this would be given on the exam along with the names of compounds that we are not familiar with.

StephanieGrigorian2J

Hi! I'm assuming we are expected to know how to determine if an acid and base is strong/weak for the final exam. Strong acids/bases are almost completely ionized while weak acids/bases are incompletely ionized in solution. Strong acids also lose H+ easily and have a weaker (longer) bond as H+ would ...

StephanieGrigorian2J

A negative pH is possible as a very strong acid can go below 0, but for the purposes of the class I'm assuming the scale is going to be from 0-14.

StephanieGrigorian2J

I'm going to put most of my focus in the textbook problems and making sure I understand how to do them since the final questions are going to come from the textbook. I'm also going to go through the textbook readings as well as lecture notes in addition to the many review sessions provided!

StephanieGrigorian2J

Some of my classes in the past also mentioned that there would be a curve at the end in order for there to be a certain percentage of students to get an A and a B in the class but I highly doubt he will be doing that in this class.

StephanieGrigorian2J

I'm assuming a large majority of questions will be based on the material that we haven't been tested on yet (outline 4-6) and the rest will be review from other outlines but I'm not entirely sure.

StephanieGrigorian2J

I usually try to create a study guide that's compiled of both lecture notes and any notes from the textbook. I mostly use the textbook and sapling for problems and for extra help I sometimes attend UA sessions. For things that need further clarification I try to watch youtube videos that will help.

StephanieGrigorian2J

I believe that 90% should be the cutoff for receiving an A of any kind. But in some classes I took in the past they curved the final grades so that there could be a specific percentage of students with an A and a B and so forth. But I'm not sure how he's going to go about that.

StephanieGrigorian2J

I'm going to re-do all the practice problems and go through my textbook notes again as well as look at the Sapling problems. I'll also be attending some of the review sessions during some step-up sessions in addition to looking at lectures for further clarification.

StephanieGrigorian2J

Anyone know any good jokes about sodium?

Na.

StephanieGrigorian2J

Because the vectors are pointing towards the chlorines in different/opposite directions, the trans-dichloroethene molecule has dipoles that cancel because of these vectors pointing in opposite directions. The cis-dichloroethene however, has two vectors that are pointing in the same direction and mak...

StephanieGrigorian2J

I would think of it by making associations with the actual name and the shape. For example, trigonal has the prefix "tri-" which means three, and there are 3 atoms around the central atom for a trigonal shape. Tetrahedral has the prefix "tetra-" which means four, and there are 4 ...

StephanieGrigorian2J

I'm usually too busy exercising my mind because of school work load more than my body but when I do it's usually just taking casual walks to get out of the house. These comments have given me some ideas though :)

StephanieGrigorian2J

I definitely feel like I made silly mistakes on both midterms and all I can do is try to minimize that for the final and hopefully it will make up for it and pay off in the end. But I'm feeling a little discouraged in terms of grades too!

StephanieGrigorian2J

I was also wondering why the hydrogen isn't bound to P but instead is bound to one of the oxygen atoms. Does it have something to do with formal charges or is it just this specific example where H is bound to oxygen instead of phosphorus?

StephanieGrigorian2J

The brackets are there to signify that the molecule has an overall positive or negative charge.

StephanieGrigorian2J

Shorter bond lengths mean that the bond is much stronger because it's harder to break and its less reactive. Longer bond lengths are much weaker and are easily broken. Longer bond lengths are due to the atomic radius of a specific atom. For example, when comparing an H-F bond with a H-I bond, Iodine...

StephanieGrigorian2J

It will cover 1D through 1F, 2A through 2D, and 3F.4 and 3F.5 in the textbook.

StephanieGrigorian2J

I believe compound names would be provided for us on the midterm exam.

StephanieGrigorian2J

Is the lecture for today posted yet? I don't see it.

StephanieGrigorian2J

I think the best we could do is go to TA office hours for clarification with midterm 1 questions.

StephanieGrigorian2J

In the email the professor sent out regarded Midterm 1 he said that it was an easy start to the quarter so I'm assuming the second exam is going to be a bit harder.

StephanieGrigorian2J

This would definitely help out a lot! Thank you so much!!

StephanieGrigorian2J

Honestly not doing as well as I would have hoped especially on the last midterm. The online format makes focusing really difficult and I have much less motivation than I did before. Miss being in class on campus :(

StephanieGrigorian2J

I don't believe there is going to be a separate session to review the midterm other than stopping by your TAs office hours. My TA said if you click on the midterm on CCLE it should show correct answers and the solutions.

StephanieGrigorian2J

Thank you so much for the help guys! :)

StephanieGrigorian2J

Maybe the problem could be in the accuracy of rounding and sig figs?

StephanieGrigorian2J

I'm having this same issue! I seem to be doing the same process and Sapling keeps saying that the answer is incorrect. Any help would be much appreciated!

StephanieGrigorian2J

HI! I was able to do the first part of this question by finding the work function but I can't seem to figure out the second question: "A metal was exposed to photons at a frequency of 1.11x10^-15 s^-1, electrons were emitted with a maximum kinetic energy of 3.60x10^-19 J. Calculate the work fun...

StephanieGrigorian2J

I don't think we will be reviewing them during our discussion sections but I'm sure that TA office ours will be dedicated to reviewing exam questions!

StephanieGrigorian2J

We went to a pumpkin patch and picked out our own pumpkins to carve! We also watched Harry Potter and exchanged spooky baskets!

StephanieGrigorian2J

Don't forget the whole Fundamentals section that was covered within the first week of class!

StephanieGrigorian2J

I'm assuming you would just have to show your TA both sides of your extra scratch paper to make sure its blank. There will be no partial credit since the format of the exam is going to be shorter questions instead of having multiple parts to each question to accommodate for partial credit.

StephanieGrigorian2J

Dr. Lavelle stated in the email he sent out that the midterm covers up until 1D.2 in the textbook, so I'm assuming either just the first question or couple of questions since most of the problems go beyond what we are responsible for.

StephanieGrigorian2J

I'm having the same problem! I logged in through the Sapling website directly and it worked! Thanks for the tip :)

StephanieGrigorian2J

Are we able to use more scratch paper than just the backs of the periodic table and constants worksheet for the midterm?

StephanieGrigorian2J

This is also given on the constants and equations sheet on the class website (which I'm also assuming will be given to us on the exam so we wouldn't have to memorize this specific conversion).

StephanieGrigorian2J

I don't really see how they can give partial credit for the exams so I'm also assuming that it's going to be multiple choice! I'm not sure if they are going to give fill-ins for the exams.

StephanieGrigorian2J

Do you guys have any idea how partial credit is going to be awarded to us on exams since everything is online? Is there even going to be any partial credit?

StephanieGrigorian2J

There will be a sheet given to us with constants and equations on the exam so we won't have to memorize those. This sheet could be found on the website under "Constants and Equations."

StephanieGrigorian2J

In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the values of n for the initial and final energy levels of the electron during the emission of energy that leads to this spectral line. Can someone try to explain how to solve this problem? I understand how to ...

StephanieGrigorian2J

On some of the Sapling homework problems I got some of them wrong because they used more precise rounding, so I'm hoping that won't be an issue in future exams. Just to be safe I've been using all of the decimal places just so I can avoid this problem, except for common elements used in problems lik...

StephanieGrigorian2J

Hi! Here is what I found on the class website: It says that exams will be TA proctored to assist us with any questions we may have and that the professor doesn't directly get involved with the exam proctoring. That's all the information about the midterms that is currently available to us though :( ...

Search found 103 matches