CHEMISTRY COMMUNITY

Shalyn Kelly 3H

I've been doubting my original plans as well. It doesn't hurt to have backup plans or other ideas, but if you really want to do pre-med, then I'm sure your motivations will push you through to the end. I'm looking forward to when we can go back to in-person schooling, and hope that it gets better fo...

Shalyn Kelly 3H

And (though I've probably missed most of the people) I'd suggest attempting to go to bed a bit earlier tonight as well! Or just set your clock forward today/early tomorrow (making sure your alarms on the 13th are still correct). Might help you vibe better with the time transition.

Shalyn Kelly 3H

Thank you Dr. Lavelle and thank you to the TAs and UAs for doing so much for this class.

Shalyn Kelly 3H

As everyone's stated above, I believe it's J/mol or kJ/mol you just gotta pay attention to which one you've got so you can keep it consistent throughout your work.

Shalyn Kelly 3H

I agree with all that's been mentioned above. You'll want to try doing as many practice problems as you can. However, if you come across a topic or two that you completely don't understand (and doubt you can figure it out quickly) I'd suggest skipping it and saving it for later! Make sure that you c...

Shalyn Kelly 3H

shevanti_kumar_1E wrote:I think it's important to know the linear plots for each order.
0-order: [A] vs time
1st-order: ln[A] vs time
2nd-order: 1/[A] vs time

Here's a helpful graphic organizer that helped me memorize all the important info.

Thanks for sharing!

Shalyn Kelly 3H

A catalyst will show up in the steps of the reaction but will cancel out and not be in the overall equation.

Shalyn Kelly 3H

I would like to move into the dorms if it's safe. It's getting kind of lonely being in my room all the time.

Shalyn Kelly 3H

Hi! Kind of similar to the person above, I'll probably take a walk and hang out with my cats—maybe continue trying to teach one a trick lol. Discounted pizza and pie sounds cool though! Good luck everyone :)

Shalyn Kelly 3H

Seeing some of these answers was really nice. Personally, I haven't found what really works to help me through burnout, but I try to schedule time to talk to friends or family (about random stuff, their lives, play games, whatever really) to momentarily distract myself from school.

Shalyn Kelly 3H

When might water be used directly as a reducing or oxidizing agent? Would the overall question just say so or would there be other tells?

Shalyn Kelly 3H

As stated above, just find the orders of the reactants and add them together and you're set. :)

Shalyn Kelly 3H

So many people like sushi lol, I think it's pretty great as well but I have a sweet tooth so my favorite would probably be key lime pie.

Shalyn Kelly 3H

I'd agree and say The Organic Chemistry Tutor is great for review, and if you know specifically what you'd like to view, Khan Academy sometimes has good practice problems/explanations.

Shalyn Kelly 3H

This walkthrough was super helpful! Thank you. Thank you for these instructions! Very helpful. I am still a bit confused about how we know that NO loses three electrons. I believe we just start by determining the oxidation numbers (NO and NO3- here), then you compare them to see how they've changed....

Shalyn Kelly 3H

I played a few videogames (after the ls30B midterm on Sat) and I might also watch WandaVision today! It seems interesting :)

Shalyn Kelly 3H

Hello, Much like everyone else above, I'm not sure if there's an actual date they have where professors will be added, but I'd recommend signing up for whichever class you want (just stick to the one that has the most desired time slot for now I guess). You can always try to switch/drop later if you...

Shalyn Kelly 3H

I'm planning to continue my cluster course and take chem 14c, ls7a, and stats 13 (if they are still available, I haven't checked recently). If not I'll either go for another math or something else.

Shalyn Kelly 3H

I agree with those above. The final was harder mostly because there were more questions and content. The questions themselves weren't necessarily more difficult. Plenty of help appears for reviewing though, so I'd suggest attending those sessions.

Shalyn Kelly 3H

Hey! To solve this problem, all you do need is the final and initial volume as well as the amount of moles, which indeed it gives. Given that the value of the final volume is 1/5, this would mean that the original volume is just 1 (since it is 1 whole and the final volume is compressed to a fifth o...

Shalyn Kelly 3H

Happy Valentine's Day! Have a great weekend everyone :)

Shalyn Kelly 3H

As stated above, 200/400 points will get you a C- which is passing, but I'm unsure of how many points warrant the other grades. 320/400 for a B- (80%) seems understandable though.

Shalyn Kelly 3H

Just to clarify, C(subscript) is for representing something remaining constant? thank you

Shalyn Kelly 3H

Thank you for sharing! I also pause the lectures a lot, even if it's just cause I write slow.

Shalyn Kelly 3H

I've always been warned about putting hot cake pans in the fridge to cool them down haha. I tend to be impatient and hurrying the chilling process can lead to terrible things for both cake pan and cake.

Shalyn Kelly 3H

Hi! I've been struggling with motivation as well, and some of the things that help me complete assignments/study include making a list of stuff I want to be done (even just on a post-it note) and crossing/erasing/deleting items once I've completed them. I typically plan out each week and have an ove...

Shalyn Kelly 3H

Hi! As above, I'd go off the number in "Your Posts" rather than what shows up on the right once you comment/post something.

Shalyn Kelly 3H

Hi! Bouncing off above, a quick google search gives me the following mnemonics: Strong Bases: Larry (Li) Never (Na) Killed (K) Real (Rb) Cats (Cs) Carly (Ca) Said (Sr) Boldly (Ba) or a more horrifying one Little Nannies Kill Rabbits Causing Carnivorous Screaming Babies And for Strong Acids: (this on...

Shalyn Kelly 3H

Glad you figured it out! Just in case, the ICE (or RICE) table requires Molarity (M), so if you are given moles you'll need to divide by L to get the Molarity.

Shalyn Kelly 3H

Hi! Both K (and Kp) and Kc represent equilibrium constants, but Kp is for partial pressures and Kc requires you to calculate using the molar concentrations.

Shalyn Kelly 3H

Thanks for the optimism and advice to relax a bit! :D
I took a day to play Minecraft and watch YouTube, but now it's time to catch up in other classes lol.

Shalyn Kelly 3H

Hi! As stated above, if we base it off of 14A, midterm scores are released about a week to a week-and-a-half (give or take a few days) after the test is over—depends on if there's anything they want to fix. So they'll be out fairly soon :)

Shalyn Kelly 3H

I'm about to try some of these out lol. Currently I listen to a few songs from AJR, the Oh Hellos, and Beach Bunny. If I'm working and listening to music though I tend to choose game soundtracks, the one I'm using rn is from the Shadow of the Colossus Remake.

Shalyn Kelly 3H

I really like rewatching The Princess Bride. And any animated films are usually fun to watch.

Shalyn Kelly 3H

Yes, you can use any calculator (last quarter they preferred scientific but graphing is fine too) and then you will need to print the equation sheet on his website and the specific periodic table he has. They usually let you have 1-2 pieces of scratch paper (depending on the TA) and other than that...

Shalyn Kelly 3H

I signed up for this class because I thought lectures were asynchronous. I have a time conflict with another class so does anyone know if will I be able to take the midterm during a different lecture? You may be able to contact your TA/the professor to see if you can sign up for an alternate time s...

Shalyn Kelly 3H

Hi! For -log just match pH or pOH to what you are taking the -log of.
pH = -log [H+]
pOH = -log [OH-]
Also keep in mind as mentioned above that pH + pOH = 14

Shalyn Kelly 3H

Hi! I feel like this was mentioned somewhere, but as I cannot find it I'm sure we'll get an email closer to time. For now, my guess would be that perhaps some of outline 3 will be included. I believe we only have 4 more lectures (since Monday is a holiday, and the Friday of the test will have no lec...

Shalyn Kelly 3H

P=Pressure in atm
V=Volume in Liters
n=number of moles
R=Gas Constant
T=Temperature (always in Kelvin cause of R's units I believe—to convert from Celsius add 273.15)

Shalyn Kelly 3H

Hi! Le Chatelier's principle is basically how the system will strive to achieve equilibrium whenever presented with change. I like the post above where the reaction is described as a balanced scale that will want to even itself out again.

Shalyn Kelly 3H

As stated above, you'd include water if in its gaseous state (as ICE uses aqueous and gases), but not if it was presented as a liquid (ICE doesn't include solvents or solids).

Shalyn Kelly 3H

Hi! Kelvin should be used, and I think the conversion is on the equations sheet, but it's also fairly simple so attempting to remember to add 273.15 (in order to convert Celsius to Kelvin) would probably be a good idea.

Shalyn Kelly 3H

I would agree with those above that the individual questions will likely just be worth fewer points. I'm sure we'll also get more information closer to time.

Shalyn Kelly 3H

Hi! As stated above, K is when the system is at equilibrium and Q is when it is not. So, if you are given the K and asked to find Q and then Q=K, you'd know the system is at equilibrium. Q can also be used to find out whether the reactants or the products are favored.

Shalyn Kelly 3H

Just to clarify, if you remove enough reactants the system would likely be Q>K (where [products]>[reactants]) and if you add enough reactants the system could tip to be Q<K ([products]<[reactants])?

Shalyn Kelly 3H

Hi! Coming from another post about this, I think K is when the system is at equilibrium and Q is when the system is still reacting (you can also use it to find which side is favored). So, if Q=K then the reactants and products should have reached equilibrium. Also, I believe the questions will ask f...

Shalyn Kelly 3H

Hi! You're correct! K is when the system is at equilibrium and Q is when the system is not, so if Q=K then the system has reached equilibrium.

Shalyn Kelly 3H

Yep! As stated above, all questions should be multiple-choice, for 6 points each, with no partial credit. It'll be structured like the midterms. Good luck!

Shalyn Kelly 3H

Thank you for the motivation! Good luck to everyone on their finals! You've got this!!

Shalyn Kelly 3H

Hi! As stated above, I'm pretty sure only some will be from the textbook problems, but the rest will most likely be similar.

Shalyn Kelly 3H

This is great! I completely forgot about quizlet for a moment, thanks for sharing!

Shalyn Kelly 3H

This is great for memorizing them! Thank you for sharing!

Shalyn Kelly 3H

Hi! As stated above, you apply alphabetical order to the name of the ligands (ammine, chloro), and then simply add the respective prefixes after (tetra, di).

Shalyn Kelly 3H

Hi! I believe you use -ate when the whole compound has an overall negative charge.

Shalyn Kelly 3H

Hi! If you're having trouble remembering which one is symmetrical, I use: Assuming symmetrical is the norm: polar molecules are typically asymmetrical, so I think of how they like to be "different" or have "polarizing opinions" hence the asymmetrical shape; nonpolar molecules are...

Shalyn Kelly 3H

I can log in and such, but I'm unfortunately still unable to load any of the videos, even with the VPN. It does seem like some can access the videos though, so maybe if we keep trying we'll get one to load?

Shalyn Kelly 3H

A bit stressed with all that's happening, but overall I'm doing well. I've met some new friends despite the lack of in-person meetings, and I'm looking forward to the break. It's nice someone asked here. How are you?

Shalyn Kelly 3H

Hi! Flash cards are a good way, but if you don't fancy flashcards, you can at least copy one of the charts from google to reinforce the shapes and their respective notes (bond angles, shape, number of electron-dense areas, number of lone pairs, etc).

Shalyn Kelly 3H

Seems like they should be covered before the final, seeing as it's cumulative. They seem shorter as well, so I wouldn't worry too much about the amount of new stuff.

Shalyn Kelly 3H

Since #19 was mentioned, my sapling questions #11 and #19 are the same question (both are "What is the hybridization of phosphorus in each of the molecules or ions?"), should they be this way?

Shalyn Kelly 3H

Are lone pairs what make the bond angles "less than (<) 120" and such? And if there are two lone pairs then the bond angel would be less than less than (<<)?

Shalyn Kelly 3H

As the post above states, it kind of looks like a seesaw. Two bonds are at the bottom forming a somewhat triangular shape, with two more bonds balancing on top (where if you "bounced" them they'd tilt like a seesaw). I guess you could also pretend the lone pair are kids on the seesaw as we...

Shalyn Kelly 3H

The above replies helped my understanding as well. For this question, we just look at phosphorus and count the bonds (regardless of single, double, etc) and lone pairs surrounding it. That number is the regions of electron density and we can find the hybridization from there.

Shalyn Kelly 3H

Hi! Something that helps me is "dissecting" the shape names; for trigonal, "tri" is three, so there are three branches, etc. I also remember in high school we drew out a little chart similar to the picture posted above, so maybe just drawing the diagram out for yourself will help...

Shalyn Kelly 3H

Hi! As above posted, I'd definitely try to include them if you can, especially if given the information to do so. Should never hurt your answer.

Shalyn Kelly 3H

Hi, follow up question. What does it do for the elements to be isoelectronic? Do they act similarly? Or does it affect them in other ways?

Shalyn Kelly 3H

As stated above, you can try "dissecting" the shape names to better understand them. I learn best from practice, so looking at different random shapes and naming them might help too.

Shalyn Kelly 3H

These are really helpful, thank you for sharing.

Shalyn Kelly 3H

Got some chills lol. I would call out that green and yellow were in weapons, but I was sus of them because they went right with reactor going off. Also, hopefully, I'll remember that downloads don't make the taskbar go up, only uploads.

Shalyn Kelly 3H

Hi! I'm not sure as to how many there will be exactly, but my TA said there'd likely be more MC questions than midterm 1. As stated above: because there's less calculating to do, the questions should be faster. Also with more questions, you can miss a few answers and it won't hurt your grade as much...

Shalyn Kelly 3H

This helped me as well! Thank you. I struggled a bit with question six too, and these tips are good.

Shalyn Kelly 3H

I really enjoyed watching Total Drama Island when I was younger and then rewatching it with my little sister. I like Lucifer on Netflix and just recently finished The Queen's Gambit. Hannibal and Criminal Minds are also some of my favorites.

Shalyn Kelly 3H

Hi! As those above have stated: yes, VSEPR helps determine the polarity of a molecule because the theory is that electron pairs and lone pairs repel each other, thus making a more symmetrical shape for the molecule (non-polar) vs. having awkward pulls and skewing the shape making the molecule polar....

Shalyn Kelly 3H

Just to clarify, would a base also be stronger if it's completely soluble, or is it the other way around for them?

Shalyn Kelly 3H

Hi! As stated in all of the above posts, an element with a negatively charged ion has a larger radius than one that's positively charged. There are also the periodic table trends you can use for quick reference.

Shalyn Kelly 3H

Hi! I agree with the post above, and if I recall correctly, the horizontal trend is a bit stronger than the vertical. However, I'm unsure if there are any straight up exceptions to the atomic radius trend.

Shalyn Kelly 3H

In response to Lillian's question, I believe they would be counted because the "outer" numbers (2 & 2 in this case) enact the sigfig rules. So, if you have 9,104 you'd have four sig figs.

Shalyn Kelly 3H

Hi! I am also in the boat floating on worry lake, so don't feel too alone. I think if you take how you felt about the first midterm and compare it to how you want to do on the next few tests, then you can try different study materials/reviewing styles if you want to do better or if you feel as thoug...

Shalyn Kelly 3H

This sounds so fun! I'll help shut off the reactor.

Shalyn Kelly 3H

Hi! I don't know for sure since I'm not one of the people handling them, but I'd say a few days at least. I think they mentioned they would review the questions/answers for errors and solve any problems that arose - pretty sure it's a new way of doing testing after all. So, I'd guess sometime next w...

Shalyn Kelly 3H

Hi! I think everyone above covered it pretty well, but if you're still having trouble, I like to draw out the trends (color-coded if you want) on a periodic table to kind of solidify them in my memory. So including the others: ionization energy and electron affinity decrease down (vertically) a grou...

Shalyn Kelly 3H

Hi! All of what's above, and I also think it's a generally good idea to have a mini periodic table somewhere in your notes/review materials with all of the trends (atomic radius, ionization energy, electron affinity) written down (color-coded if you want) to help memorize what they are. Like ionizat...

Shalyn Kelly 3H

I like to watch YouTube or Netflix, play games with friends (online of course), and paint or draw little doodles. I also enjoy making origami cranes if I just need something to keep my hands busy.

Shalyn Kelly 3H

Hi! I received my online version of the textbook (the card and all), but I don't think I ordered a physical textbook so I'm not sure on that account how they're handling it. It could be a good idea to send a quick email to whoever you ordered from to see if they can update you on where the book is i...

Shalyn Kelly 3H

I suppose because it'd likely take a lot of time, money, and commitment. Everyone has got to be on board and they'd have to start teaching it in schools and such. It would be nice to see it happen though.

Shalyn Kelly 3H

Hi! Agreeing with everyone above, just go with your gut feeling for rounding. If you have to multiply by an extremely large number for it to work out or you feel like something is off, you can always check your previous calculations as well to be sure nothing went wrong there. Generally, I aim for l...

Shalyn Kelly 3H

Hi! Yep, basically what's been said above. I'd use what's on the constants sheet, but the more the merrier (especially when using a calculator).

Shalyn Kelly 3H

Hi! As stated above, we can print and use both the periodic table and the equations and constants pages from Dr. Lavelle's website. My TA also said we could bring an extra sheet of paper (maybe just copy paper so it's easier to see how blank it is) and getting it approved at the same time they look ...

Shalyn Kelly 3H

Hi! I'm not aware of a particular saying for when they're the same. However, it's definitely possible that the molecular formula ends up without any subscripts that can be reduced (to integers), making it the same as the empirical formula.

Shalyn Kelly 3H

Hi! Bouncing off everyone above, black body radiation absorbs all light frequencies making it completely invisible. Currently, it is only a theoretical concept, because there're things close, but not quite invisible - also more of a physics one. Dr. Lavelle mentioned it a few times, but he also made...

Shalyn Kelly 3H

Hi! I definitely agree with everyone that a graphing/scientific calculator will definitely be handy. Other than paying close attention to what you put into the calculator (so you don't mistake a number or miss a button), Lavelle suggested that we should try and predict - understandably harder for th...

Shalyn Kelly 3H

Hi! I definitely agree with those above that we should memorize the visible spectrum (400nm violet - 700nm red) as well as using a mnemonic to remember either shortest to longest or longest to shortest wavelengths - just remember which way you've memorized it lol. The one I've seen that stuck with m...

Shalyn Kelly 3H

Hi! As said above, and I think in the first video, the constants and some equations will be provided, you'll just need to know how to apply/use them with the question. It'd probably be a good idea to at least familiarize (nearly memorize) yourself with all of the equations listed on that page (I bel...

Shalyn Kelly 3H

Hi! I don't know what's up with the website, but you can access the sapling book through CCLE by going to External Tools, Chemical Principles/Sapling Learning, and then clicking on the top link/image. Hopefully you can log on soon!

Shalyn Kelly 3H

Hi! I believe for written problems it will typically be given to you unless you are to find it. In which case you should be able to find/be given the theoretical and percent yields. I think you multiply the theoretical and percentage yield to get the actual yield. Think of it with the formula: (actu...

Shalyn Kelly 3H

Hi! As everyone above has said, I'm pretty sure that there's no set way of balancing them. I tend to leave H and O for last (as they can be the most finicky). I then pick an element that's usually attached to something else (like if Al 2 is by itself then it'll likely to be easy to balance later so ...

Shalyn Kelly 3H

Hello, I'd suggest taking notes on the lectures, and then maybe when you are reading/working the problems have your notes from lecture next to you and go back over them (you can use a different colored pen) to fill in anything you come across that corresponds with the lecture notes. It really is up ...

Shalyn Kelly 3H

Hello, I do believe I heard someone - either Lavelle or I'm tripping - mention that when grading, they'll be looking to give you points (so if the balancing and everything else is correct, then I don't see them keeping points from you). Take the equation CH 4 + 2O 2 --> CO 2 +2H 2 O , if you write i...

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