CHEMISTRY COMMUNITY

idella 1D

I totally feel you right now, and it's so relieving to know that I'm not the only one feeling doubts right now. I can't tell you how many times in the past week I've started panicking over med school/pre-med stuff (when I should have been focused on chem lol) Online school is tough, and everyone I k...

idella 1D

Do you guys know if Lavelle rounds grades?

idella 1D

are there any problems similar to this in the textbook?

idella 1D

thank you!

idella 1D

Arya Adibi 1K wrote:There is a ln(A) constant in that equation, maybe it will shift your answer

what do you mean by that?

idella 1D

Hello. Can someone explain how to solve this problem from the chem textbook? I used the formula for an Arrhenius equation that looks like this: ln(kr2 / kr1) = Ea/R (1/T1 - 1/T2) However, I got an answer that is WAYYY off from the textbook solutions. Can someone please explain? Thanks: The rate cons...

idella 1D

Here are some things I keep in mind when writing cell diagrams: - Always make sure you put the oxidation half-reaction on the left, reduction half-reaction on the right (to remember this, you can think about how "reduction" and "right" both start with the letter r, so the r's go...

idella 1D

I am still a little confused on where to put Pt when there's no conducting metal. I think I've seen it on the right and left. I had asked a similar question too. I think it depends on if each of the half reactions requires a solid to serve as an electrode. If one of the half reactions doesn't have ...

idella 1D

Hello! I'm a little stuck on how to see what elements are reducing agents for species in aqueous solutions, like in question 6M.7 from the textbook. How can you figure this out?

idella 1D

Does anyone have any tips or help on how to make cell diagrams? I sometimes mess up on the orders of my items :(

Thanks!

idella 1D

Hello all! I have a quick question in regards to cell diagrams. When do you put a Pt(s) in your diagram and when do you not? Also, I've seen some solutions in Atkins_7e_SSM that have Pt(s) on only one side of the diagram.

I would gladly appreciate any help! thanks

idella 1D

Hi! So since the reaction isn't in standard conditions, where [H+]=1 M and PH3=1 atm, we have to use the Nerst equation for nonstandard conditions: E=E˚-(0.0592V)/n logQ. Using the equation 2H+ + 2e- --> H2, we can find the E˚ from the table, and we can determine Q from Q=P/R (make sure to square t...

idella 1D

Hi! If your current person to switch with falls through, the r/ucla reddit and the discussion section of the class ccle page (not sure when that opens though) are also good places to try. thanks for letting me know! I did actually get switched already so I got lucky, but I will keep that in mind fo...

idella 1D

I also have a LS7B midterm tomorrow :(( I haven't started WandaVision but I might. Is it really good though? I've heard some gooood things about it. OMG is Wandavision AMAZING! I love all the marvel movies and am a huge fanatic, but even my mom who hasn't seen any superhero movies ever is enjoying ...

idella 1D

Lavelle has a whole week of review sessions leading up to the final which I highly recommend visiting. Also, one important thing would be relating past topics we learned to something we learned at the tail end of the quarter.

idella 1D

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...

idella 1D

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

idella 1D

Maryeli Garay 2H wrote:Hi! I'm not in this class or discussion, but I would suggest asking in the class groupme! There are a lot of people in it and I'm sure someone there will be able to switch :)

yep already did that! and found someone thank goodness. chem community was the last resort 0.0

idella 1D

John Antowan 1K wrote:Hi! I don't have that class but I know someone who might be willing to switch. Let me know if you still need the spot!

Heyo thanks for replying! I think I might have found someone willing to switch already, but thank you!!

idella 1D

yay congrats everyone! we're so close to being done :)

idella 1D

I would say go with the information in Lavelle's emails! The TA's mentioned are hosting office hours at the times mentioned in the email! Just hope you're not Lecture 1 because the test is at 11am so it would be hard to go to some TA hours.... (or not worth it since you'll be done by 12) Good luck a...

idella 1D

Hi everyone! I'm looking to switch with someone to a different discussion section for Chem 14 C.

I am in lecture 1 Discussion Section 1B which is on Tuesdays from 2-2:50 pm.

I will gladly appreciate it :')

idella 1D

thank you!!

idella 1D

Hello all. I'm having a bit of difficulty in trying to solve question #7 from the sapling homework. I would really appreciate a step-by-step approach since I think that all the tiny things we have to do are tripping me up. Three liquid samples of known masses are heated to their boiling points with ...

idella 1D

Me and my friend were studying for our quiz and spent quite a while working on this question. In the end, we also got the same answer that Kitu Konya got and used the same method. I think the answer in the book is wrong. hello from 2021; yes, I do get a similar answer to Kitu and various others. th...

idella 1D

I totally feel you on making careless mistakes. after reviewing my midterm with my TA i saw places where I had just slipped and made a simple mistake. Considering the time crunch we're given, I still highly suggest taking your time and double, even triple-checking questions when there is time. Writi...

idella 1D

I'm watching videos on youtube to try and help nail the concept this time around since thermo seems to be a handful... plus I've always used outline book problems to study with too :)

idella 1D

I am exatcly in the same boat as you. It is a bit discouraging after working so hard, but I am trying a complete 180 in the way's I study. I highly recommend going to UA sessions (Kate's Workshops on Thursday nights are AWESOME) and just trying to nail down the concept. For me that was my issue (not...

idella 1D

As someone who loves to bake and cook, it's super interesting to see the relations it has to chemistry and how chem has been able to explain a lot of stuff. One thing that I always remember now is the question/topic/idea we covered (don't remember exactly at this point) about why steam is so much ho...

idella 1D

Thank you! I figured it out eventually :)

idella 1D

Hey I'm a bit stuck with this problem on the sapling hw: A constant‑volume calorimeter was calibrated by carrying out a reaction known to release 1.73 kJ of heat in 0.300 L of solution in the calorimeter (q=−1.73 kJ) , resulting in a temperature rise of 3.39 ∘C . In a subsequent experiment, 150.0 mL...

idella 1D

Juliet Cushing_2H wrote:I think what is wrong with your first step is that you are dividing by the final temperature (2.89+273) when the equation only calls for delta T (2.89º). Try using just this value on the denominator to find Ccal!

what would you do for the second calculation? like for qcal?

idella 1D

Can someone explain why you use 0.0826 when finding n(moles) and 8.314 in the full on question for work? I'm confused why

idella 1D

After looking at my score for midterm 1, I'm feeling a little bit upset... I've done a lot to prepare (the outlines, attending UA sessions, doing sapling problems, even signing up for tutoring) and felt really confident in myself. However, after getting my results back, I do feel discouraged after n...

idella 1D

Just figured this out! my mistake was not adding the energy to melt ice :')

I got my answer to be around 31.7 degrees celsius. Hopefully my tears don't show up on this picture:

idella 1D

Hello! I think your setup would look a little something like this. Using the q = mCsdeltaT equation you can input the information that you know from both the ice cube and the water and set them equal to each other. (53.0g)(4.184 J/g*C)(Tf - 0C) = - (444g)(4.184 J/g*C)(Tf - 45C) You then multiple th...

idella 1D

Hi! This is kind of really messy, but I’ve attached a link to a picture of my work for that question. Since you say you’ve already read through the other posts regarding this Sapling question, I hope you’ll get what exactly it is I did, but if you don’t, lemme know and I’ll explain! https://imgur.c...

idella 1D

This is what i did but I'm still not getting the right answer....

idella 1D

I'm having a bit of struggle solving question #10 on sapling Week 4 hw. I've been looking all over chem community, but honestly I would appreciate a more visual explanation of what to do. Thank you so much to anyone who helps: An ice cube with a mass of 53.0 g at 0.0 ∘C is added to a glass containi...

idella 1D

I'm having a bit of struggle solving question #10 on sapling Week 4 hw. I've been looking all over chem community, but honestly I would appreciate a more visual explanation of what to do. Thank you so much to anyone who helps: An ice cube with a mass of 53.0 g at 0.0 ∘C is added to a glass containin...

idella 1D

What does the enthalpy pirate steal?

Joules

idella 1D

Let's take all of these bad chemistry jokes and BARIUM

idella 1D

I personally am not a fan of kdramas (idk I'm not much of a romance tv trope lover) BUT my roommates are currently watching Start Up on Netflix! I watched an episode or two and it is a sweet show :)

idella 1D

After talking with my departmental advisor (which i HIGHLY recommend you to do if you don't already talk to them) they recommended not to do Chem 14C and 14BL at the same time. I decided on taking Chem 14C during the spring quarter and am planning on taking 14BL this summer. I will be working during...

idella 1D

Also, side note I've seen for session A there is a teacher, while for session C it's taught by "The Staff"

Does anyone know what that means?

idella 1D

Hey hey everyone! I just wanted to see if there is anybody else taking Chem 14BL (the lab) this summer? I'm planning on taking Chem 14C in the spring and have signed up for summer session C for the lab.

Love to meet other crazy people planning on spending summer doing classes hehe (:

idella 1D

Yes Week 3/4 homework is due THIS SUNDAY (2/7) before midnight. Week 5/6 homework is due NEXT SUNDAY (2/14)

idella 1D

Yea we've kinda also don't have much accurate (in a sense) past midterm stuff since all of this is now online (obviously). I've really just been relying on the book and sapling because the past tests that upperclassmen have shown me are slightly different.

idella 1D

idella 1D wrote:Yea im a bit confused as well because even when I assume that it is very small (and that 0.22-2x is still 0.22) i still get the 8.39*10^-34 barr? Is there something I am doing wrong 0.0

jeez i just realized this post is 2 years old omg- whoops

idella 1D

Yea im a bit confused as well because even when I assume that it is very small (and that 0.22-2x is still 0.22) i still get the 8.39*10^-34 barr? Is there something I am doing wrong 0.0

idella 1D

Yea I ended up figuring it out. So like I had noticed, I do have to use Le Chatlier's in this. So for a) I said that an increase in lactic acid will lead to an Increase in the concentration of HbO2-. this means it will shift right to the products side and therefore HbO2- will decrease for b) when mo...

idella 1D

hey all! I just have a quick question on how to approach this problem found in the textbook. I would gladly like some help :') Hemoglobin (Hb) molecules in the blood carry O2 molecules from the lungs, where the concentration of oxygen is high, to the tissues where it is low (see the Interlude follow...

idella 1D

Oops! Figured it out haha

For anyone who was stuck, you have to find Q using the concentrations given to us (don't forget to divide the mols by 5.00 liters) and get the value for Q. using that, you can determine which direction it will go by comparing Q to Kc and then use an ice chart

idella 1D

I'm having some difficulty solving this problem from the book practice. I would appreciate some help A reaction mixture is prepared by mixing 0.100 mol SO2, 0.200 mol NO2, 0.100 mol NO, and 0.150 mol SO3 in a reaction vessel of volume 5.00 L. The reaction SO2(g)+NO2(g)⇌NO(g)+SO3(g) is allowed to rea...

idella 1D

What band is a favorite amongst chemists?

di-uranium (U2)

idella 1D

Which chemical compound do UCLA students think is second-best?

Uranium Carbon Boron
(aka, UC Berkley)

hehe

idella 1D

Some of my most favorite movies to watch whenever I'm down are Shrek and Shrek 2(never disappoint), anything with Will Ferrel in them (Talladega Nights, Anchorman, Megamind), and obviously some star wars or marvel movie that I haven't rewatched in a while.

idella 1D

Ok don't @me for having the music taste of a dad but I love listening to music from the 60s/70s/80s. Queen, Elton John, The rolling stones, and David Bowie never disappoint. Prince really puts you in a good mood, and lately, I've been listening to Billy Joel on repeat. Anything you would hear on a r...

idella 1D

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...

idella 1D

Yep, just have your periodic table, equation sheet, calculator, and scratch paper if desired. Your TA will probably email you and go over it as well.

idella 1D

Most likely, the midterm will be multiple choice. Once again, it's not 100% confirmed, but all of our tests for 14A were structured that way. Usually, Lavelle offers good reviews thru UA sessions and stuff during Week 4, so do utilize them!

idella 1D

Yea this is the first time I'm hearing about this? Did lavelle discuss this during OH? My TA hasn't mentioned this yet.

idella 1D

For the outlines, I usually like to read through the chapter/sections and take notes. It's just another set of helpful info that goes along with the lectures, Audio-visual assignments, etc. The problems from the outline are very, very similar to what is given as practice by TA's and on the tests. Pl...

idella 1D

I think my chemistry teacher might be asleep...
Today there hasn't been even one reaction from him.

idella 1D

idella 1D wrote:What is one of the worst compounds to use for chemistry?

Uranium Scandium

(USc)

proud to say that prof. Lavelle used this joke in today's lecture :D

idella 1D

I personally would ask your TA, but Im sure you don't need to get 100 posts if you just entered this quarter. As long as you hit 5 per week, for ten weeks, and have 50 total I'm sure you will be fine!

Plus, I don't think they're mean enough to make you do double ;)

idella 1D

Even though they are optional, it doesn't hurt to do them! Any and all practice is beneficial for this class

idella 1D

Hi! I know I've posted in this before but I was wondering if there are any updated tutoring sites/organizations? I think some are starting during week 3

idella 1D

Lavelle is able to offer us plenty of resources to use for this class, so I highly recommend you use them. First, the website he has (not ccle) has links to TA, UA, etc. sessions that are often during the week. There are step-up sessions and zooms designed to help you out, and you can drop in or lea...

idella 1D

Good luck everyone!

idella 1D

The chart you shared was something I used a lot in high school chem and I found it very helpful. I also have this list of molecular shape geometry that I also used to help me out.

idella 1D

I remember way back during one of Lavelle's first few office hours of him stating how many problems on midterms and finals would be from/based on the textbook!

idella 1D

Yep, OH2 personally. I think it's just something that's easier to remember that its H2O but writing it as OH2 can help if you're not so great with figuring out what bonds and what doesnt

idella 1D

What is one of the worst compounds to use for chemistry?

Uranium Scandium

(USc)

idella 1D

it worked after like 20 min. of me just leaving it alone. I wonder what happened?

Also, I usually use the VPN anyway to view lectures so I think something might have just been temporarily down for some reason.

idella 1D

is anyone else having trouble trying to view the lecture posted today? It says video file cannot be played...

idella 1D

thank you guys!!

idella 1D

Hi, this was very helpful and wanted to add in my compound for others to see a different example. Compound: [Co)NH 3 ) 5 Cl]Cl 2 Practically the same steps as Idella, Since NH3 is my ligand and there are five, I said Penta ammine. Next is the one chlorine, so I did not put a prefix just "chlor...

idella 1D

Hi! I know that some people might have different numbers/questions depending on their account on sapling. Here is how I got the answer to name my first compound: Name the following compound: [Co(NH3)3 Cl3] First, since all of the compounds are in the bracket, I am not so worried. Since NH3 is my li...

idella 1D

Can't wait to binge watch my favorite shows after the quarter is done! Some of them include the Crown (Netflix), Great British Bakeoff (Netflix), The Mandolorian (DisneyPlus), and Umbrella Academy (Netflix) I also have a big love for the cooking channel/food network. Chopped and all the baking champ...

idella 1D

Hi! I hope i don't seem dumb but what time is prof. lavelle's review session tomorrow (Wednesday)? I swear I can't find it on any of the announcements or emails. I might just be overwhelmed with studying lol

idella 1D

Lillian wrote:
Halle Villalobos 3C wrote:Hi! I believe there is a link to a google drive test bank folder in the class GroupMe that has past exams. Good luck with finals!

Ooohh! Noted!

what groupme class would it be? i think I left one of them way back during midterms haha

idella 1D

I won't lie, I am trying to attend around 3 a day! I'm trying to do a session from at least every TA and at least once for each subject. I know everyone's schedule is different, but this is what worked for me. Try to go to as many as you can! Reviewing old topics has proven to be good because althou...

idella 1D

Hi all! I just wanted to share some very helpful videos that can are great to understanding naming compounds and beyond. I relied heavily on some of these in Honors and AP Chem, and they can hold true for Chem 14A too in my opinion. Feel free to check them out if you are having issues with compound ...

idella 1D

A complex is a species containing a metal atom in its center or an ion, to which a number of molecules, or ions, is attached by coordinate covalent bonds. More specifically, a complex ion has a metal ion at its center (basically what I said in the previous sentence). A coordination complex is a comp...

idella 1D

there is a very helpful table I found of common ligands in Sapling. It was taken from the Focus 9C.1 Section. I also think that once you do a significant amount of practice, you're just going to start remembering all those ligand names. Like even with just doing a few problems naming with OH2 I reme...

idella 1D

I have a slightly different equation for #5 but here is what I did: (and yes, en represents ethylenediamine which will be 2 "spots" of sorts) I find it helpful to draw out the lewis structures for each of the compounds. For the ones inside the bracket, they are connected to each other. Som...

idella 1D

Summer_Corona 3F wrote:After looking at your answer the only one you seem to have wrong is [Co(SO4)(NH3)5]. You placed it in box two but I think what you're missing is that there are five NH3 molecules and one SO4, therefore, the coordination number would be 6

thank you! isee what I did wrong haha

idella 1D

I'm having some difficulty sorting out the ligands for this question: Classify each of the coordination compounds according to the coordination number I put my chart (I know it's wrong) but I would appreciate any pointers to show what molecules I have wrong. I'm just a tad stuck... I know that the c...

idella 1D

Hi! I know that some people might have different numbers/questions depending on their account on sapling. Here is how I got the answer to name my first compound: Name the following compound: [Co(NH3)3 Cl3] First, since all of the compounds are in the bracket, I am not so worried. Since NH3 is my lig...

idella 1D

I'm really worried because I did significantly worse on my second midterm compared to my first (and I was complaining about it) I mean, I am able to pass but back then I was worried about not getting an A- but now I'm worried I might not get a B. I just feel so upset because I went over my midterm w...

idella 1D

Ferrate was used at least by my TA when dealing with Iron. It is because it's the latin "ferra" and then the "-ate" at the end of the ion. I don't think it matters, but since -ferr was being used by my TA (and the UA in your case) I am assuming that is what is recommended.

idella 1D

I've also heard people saying how in the past, there might be some lee-way in how final grades might be calculated. Such as, how Lavelle might look into the overall average and might change the points. I know there is no curve.

idella 1D

Thank you!! :)

idella 1D

Honestly, since everything is online for the time being my habits have changed dramatically. I oftentimes would take notes, drawings, etc. all by hand since I tend to learn best visually and with stuff that's hands-on. Since I'm now staring at a screen all day, I find that I just type up everything ...

idella 1D

Why shouldn't you drink water while studying?

It decreases your concentration :)

idella 1D

Yes!! It confused me too because I would use angular back in Chem in highschool. It does mean the same thing :)

idella 1D

Since there are 6 total electron groups, 5 outer atoms, and 1 lone pair, it should be categorized as a square pyramidal. As mentioned above, there is a very helpful diagram that helps to figure out each and every shape.

idella 1D

Hello! I was wondering if anyone can help explain the polarity stuff for this question. I am a bit confused...

For each molecule, specify the polarity of the bonds and the overall polarity of the molecule.
Molecules: BeCl2 and H2O

Thanks!

idella 1D

I love to go walk in the evening as the sun starts to set. It's a good way to rest your mind and just focus on what's ahead of you. Plus, the sunsets are always wonderful to look at

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