CHEMISTRY COMMUNITY

chimerila

I'm still kind of confused on that too. I just know that to cancel the electrons out, make sure whatever you end up flipping, you're reduction equation has electrons on the left, and the oxidized equation has electrons on the right

chimerila

Vinita Saxena 2I wrote:PDTVHUGS:
If you're feeling under Pressure or Depressed, all you want to do is watch TV and get HUGS. Good luck!

Oh oof, thank you, I replied before I saw this

chimerila

Ohmygosh, I wish I could remember, I thought it was clever and very on brand for college life. Something like "The Pressure makes me feel Down and I just want to watch T.V. and get HUGS"

something like that, ugh, if someone remembers, please

chimerila

https://youtu.be/DsqkdbDcC7E

Hope this helps!

chimerila

Interesting, thanks for showing me the LEO one, I'll add that to my little list :D

chimerila

I find its helpful to have mnemonics for ideas, so I use LRC and ROA for reduction and oxidation. LRC - electrons are on the "L"eft side, so it's "R"educed, and it's a "C"athode ROA - electrons are on the "R"ight side, so it's "O"xidized, and it's an...

chimerila

Ahh I see, thank you for the clarification

chimerila

https://www.khanacademy.org/science/che ... tion-order

also maybe this

chimerila

Q > K, system shifts left
Q < K, system shifts right
Q = K, system is at equilibrium, no shift in either direction

chimerila

I've always wondered what the point of endorsed posts was. I don't get it, are they just posts that the prof likes or thinks are useful?

chimerila

Anything by the Organic Chemistry Tutor is bound to be good! (I love Hank Green, but his videos aren't heavy duty enough for that STEM grind)

chimerila

The test will be timed, Lavelle sent an email about it. It will be administered at the normal final time, with 30 min added for technical logistics, like logging in to CCLE. I've taken quizzes on CCLE before, and can confirm it WILL kick you out of the test when time is over. It will turn in whateve...

chimerila

To my understanding, the mass of the cathode is increasing because the ions in the solution on the cathode side are being reduced, and these reduced molecules are attaching themselves to the cathode, therefore increasing its mass. So like if you had a cathode of Cu and it was in a solution of Cu+ i...

chimerila

To my understanding, the mass of the cathode is increasing because the ions in the solution on the cathode side are being reduced, and these reduced molecules are attaching themselves to the cathode, therefore increasing its mass. So like if you had a cathode of Cu and it was in a solution of Cu+ io...

chimerila

"Balancing Redox Reactions in Acidic and Basic Conditions" by Professor Dave Explains had a nice and simplified explanation that really helped. I'll paste the link. Hope this helps and good luck!! https://www.youtube.com/watch?v=N6ivvu6xlog&t=390s Thank you so much! I'll definitely ch...

chimerila

I'm still having trouble balancing these equations. I watched an Organic Chemistry Tutor vid on it, and it was helpful but I would love to watch/listen to more explanations. Anyone have any recommendations?

chimerila

i actually do think that there will be hw questions on the exam! it's on the syllabus that the final will include hw questions, and i don't think that is going to change just because it's online. Maybe with the numbers changed then, but the same question format and wording? I would agree that that'...

chimerila

905415863 wrote:Conjugate seesaw has to do with conjugate acids and bases. A weak acid will have a strong conjugate base. A strong acid will have a weak conjugate base. You can see how this is metaphorically related to the idea of a seesaw.

yeah, it's more conceptual, not really as a means to derive a formula

chimerila

I would imagine the questions would be very close to hw questions / things we can feasibly complete. I don't think Lavelle would make it harder as he seems to be doing everything he can to make it fair and not super stressful for us. I would expect the same difficulty as the midterm. If he puts exac...

chimerila

When would we need to use that equation?

chimerila

Seriously so helpful, Lyndon for the win

chimerila

I'm hoping its more MC than usual just because of the way we have to type our answers

chimerila

JosephineF wrote:
Jose Robles 1D wrote:Wait is the whole test going to be on CCLE now right?

I believe so yes

It's open on CCLE during the normal tie our final would be, with an additional 30 minutes for log in time/other things that might come up :)

chimerila

BritneyP- 2c wrote:Last chem community post ever!

LOL, congrats! Good luck on the final :)

chimerila

A 3 Haiku Poem Set on a Biology Major's Relationship with Chemistry

You are the bane of
My existence, but I need
You for med school, sigh

I appreciate
Your boundless application
But I'm not a fan

This is why I chose
To follow biology
Through my undergrad

chimerila

It can be kind of confusing, especially since I'm so used to seeing "n" and thinking "MOLES". But to help myself, I like to remember that we're using this equation when solving problems related to electrochemistry, so "n" actually signifies electrons. "E"lectr...

chimerila

Usually, Chem Community posts are due by Sunday. But since our final is tmr, should we make sure we have all our posts done by tonight, before the final, or by the end of tmr like usual?

chimerila

Whatever happens, you'll pass the class if you get 250/500. Anything more than that, your grade is calculated based on how the rest of the class does. But the curve can only help you

chimerila

I am getting a little anxious because I do not know general details about this final. What is the exact time limit? How are we going to be tested, is it all online and are we using zoom/video recording site while taking the test? How is the test formatted? I just feel like I do not know all the inf...

chimerila

Dr. Lavelle, It's very apparent that you are passionate about the subject you teach and truly care about your students success. These are both very admirable traits in an educator, and I'm glad I had the privilege to take your class. Thank you for continuing to work with us undergrads as changes occ...

chimerila

I feel like it will be based on final answers only, as he said he was looking for options that would not require us to upload pictures or additional files. But tbh that kind of stresses me out...I love partial credit. This situation just sucks, and it's not anyone's fault. :( thanks to Dr. Lavelle f...

chimerila

HAHA, I didn't know where this was going but I like it

chimerila

Daria Azizad 1K wrote:They are based on the reaction with the standard hydrogen electrode.

Is that like...super important to know, or just a detail?

chimerila

For nonstandard cell potentials, looking at the proportions of products and reactants when calculating Q can also help you determine which direction the reaction favors. For example, if Q is a large number (so there would be a lot of product in proportion to reactants), it would be a product favored...

chimerila

So concentration cells always have a standard potential of 0V?

chimerila

https://lavelle.chem.ucla.edu/forum/viewtopic.php?t=11592

I was also confused by this, since the solution manual rewrites the cell notation, but hopefully this helps!

chimerila

For the problem given it's not a multistep reaction. In fact, you are asked to manipulate the K of the given chemical reaction to find the other K values. For example A since the reaction is reversed you would find the inverse of the given K to find the new K value for the new reaction. Ahhh, I see...

chimerila

Megan Kirschner wrote:Yes, it's the same.

I often find it helpful to cross out the equations we don't know anything about- so the equations sheet is less overwhelming.

That's such a smart idea

chimerila

I also wonder the same thing about 5H.3, as that problem seems to be requiring a similar method to solve it. Any clarification on this would be greatly appreciated "Use the information in Table 5G.2 to determine the value of K at 300 K for the reaction 2 BrCl(g) + H2(g) = Br2(g) + 2 HCl(g).&quo...

chimerila

Not to question the all knowing ChemMod (mad respect), but there's a homework problem in the syllabus that is as follows: "For the reaction N2(g) + 3 H2(g) = 2 NH3(g) at 400. K, K = 41. Find the value of K for each of the following reactions at the same temperature: (a) 2 NH3(g) = N2(g) + 3 H2(...

chimerila

Hey y’all, I lost my little Adonit stylus at the review session. It’s a two part stylus that screws together, and the stylus tip has a little clear disk. One part of it is blue and the other is silver/gray. I was sitting in the back middle section, and it must of fell out of my lap when I stood up a...

chimerila

You need a 50% to pass the class with a C-. The other letter grades are determined by the class average. Do you need a 50% in each assignment category to pass the class with a C-? Or a 50% in general. My TA made it sound like it was the former, which is kind of worrisome since I did so bad on the f...

chimerila

I guess Lavelle looks at everything at the end and establishes the grade scale. If it makes you feel any better though, I got less than a 50% on the first test, so if you got better than that I think you're doing okay lol. And if you're in the same boat I'm in, let's do our best!

chimerila

Thanks so much! Love the little funnies throughout the problem sets. If we have a good understanding of the concepts on this practice exam, do you think we're at a good place for the test?

chimerila

JesseAuLec1Dis1G wrote:I haven't. But the UA sessions can be very helpful!

Are all the UA sessions the same? Or do they give out different worksheets?

chimerila

I heard StudyBlue is a good one! It's an app where you can find premade study sets for various course. You can track your progress on correct answers like on quizlet

chimerila

I think when he says there isn't a curve he means a bell curve, meaning there isn't a specific grade distribution he wants. But it does seem like he will be curving the class, or not using a standard grading scale. This way if the overall grades aren't very high, he will shift the cutoffs so that p...

chimerila

Be like a proton and stay positive, folks :)

chimerila

For all my bilinguals out there:

Is Silicone the same in Spanish?
.
.
.
Si.

chimerila

This is my first time having Lavelle. Does he give out practice tests like some professors do? I'm pretty sure the other resources will be enough to prepare for exams, but I was curious if he does this as well. Thanks!

chimerila

For part B, the solution has been diluted due to the mistake made by the technician, so in order to solve for the pH, you would need to know the new concentration of the solution. To find that, you need to use the dilution equation: M 1 V 1 =M 2 V 2 . Interesting, it didn't cross my mind to use tha...

chimerila

Chem_Mod wrote:You first need to multiple .025M by the volume 200.0mL (or .200L), not divide. You want to multiply so you get the number of moles, which you can then divide by the new volume to find mol/L.

Ahhh, I see, I'll try that, thank you!

chimerila

Question : A careless laboratory technician wants to prepare 200.0 mL of a 0.025 m HCl(aq) solution but uses a volumetric flask of volume 250.0 mL by mistake. (a) What would the pH of the desired solution have been? (b) What will be the actual pH of the solution as prepared? I solved the second part...

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