Search found 53 matches
- Sat Mar 14, 2020 9:04 pm
- Forum: Balancing Redox Reactions
- Topic: flipping equations
- Replies: 7
- Views: 553
Re: flipping equations
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
- Sat Mar 14, 2020 9:01 pm
- Forum: Calculating Work of Expansion
- Topic: Mnemonic for State Functions
- Replies: 3
- Views: 557
Re: Mnemonic for State Functions
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
- Sat Mar 14, 2020 9:01 pm
- Forum: Calculating Work of Expansion
- Topic: Mnemonic for State Functions
- Replies: 3
- Views: 557
Re: Mnemonic for State Functions
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
something like that, ugh, if someone remembers, please
- Sat Mar 14, 2020 8:55 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Activated Complex Model
- Replies: 3
- Views: 354
- Sat Mar 14, 2020 8:53 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Mnemonic for Oxidation and Reduction
- Replies: 7
- Views: 581
Re: Mnemonic for Oxidation and Reduction
Interesting, thanks for showing me the LEO one, I'll add that to my little list :D
- Sat Mar 14, 2020 8:46 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Mnemonic for Oxidation and Reduction
- Replies: 7
- Views: 581
Mnemonic for Oxidation and Reduction
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...
- Sat Mar 14, 2020 8:41 pm
- Forum: Student Social/Study Group
- Topic: This is literally not time sensitive at all, but...
- Replies: 2
- Views: 349
Re: This is literally not time sensitive at all, but...
Ahh I see, thank you for the clarification
- Sat Mar 14, 2020 8:38 pm
- Forum: General Rate Laws
- Topic: Video help
- Replies: 3
- Views: 379
- Sat Mar 14, 2020 8:34 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Qc vs Kc
- Replies: 15
- Views: 5223
Re: Qc vs Kc
Q > K, system shifts left
Q < K, system shifts right
Q = K, system is at equilibrium, no shift in either direction
Q < K, system shifts right
Q = K, system is at equilibrium, no shift in either direction
- Sat Mar 14, 2020 8:32 pm
- Forum: Student Social/Study Group
- Topic: This is literally not time sensitive at all, but...
- Replies: 2
- Views: 349
This is literally not time sensitive at all, but...
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?
- Sat Mar 14, 2020 8:30 pm
- Forum: General Rate Laws
- Topic: Video help
- Replies: 3
- Views: 379
Re: Video help
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)
- Sat Mar 14, 2020 8:27 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Exam Time
- Replies: 13
- Views: 887
Re: Final Exam Time
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...
- Sat Mar 14, 2020 8:23 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Change in Ecell
- Replies: 3
- Views: 259
Re: Change in Ecell
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...
- Sat Mar 14, 2020 8:21 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Change in Ecell
- Replies: 3
- Views: 259
Re: Change in Ecell
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...
- Sat Mar 14, 2020 8:13 pm
- Forum: Balancing Redox Reactions
- Topic: YouTube videos for Redox Reactions
- Replies: 4
- Views: 494
Re: YouTube videos for Redox Reactions
"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...
- Sat Mar 14, 2020 7:45 pm
- Forum: Balancing Redox Reactions
- Topic: YouTube videos for Redox Reactions
- Replies: 4
- Views: 494
YouTube videos for Redox Reactions
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?
- Sat Mar 14, 2020 7:42 pm
- Forum: General Science Questions
- Topic: Final Content
- Replies: 5
- Views: 439
Re: Final Content
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'...
- Sat Mar 14, 2020 7:41 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Conjugate Seesaw
- Replies: 5
- Views: 428
Re: Conjugate Seesaw
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
- Sat Mar 14, 2020 7:28 pm
- Forum: General Science Questions
- Topic: Final Content
- Replies: 5
- Views: 439
Re: Final Content
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...
- Sat Mar 14, 2020 7:26 pm
- Forum: Van't Hoff Equation
- Topic: Equation Sheet
- Replies: 18
- Views: 1016
Re: Equation Sheet
When would we need to use that equation?
- Sat Mar 14, 2020 6:45 pm
- Forum: Administrative Questions and Class Announcements
- Topic: ENDGAME Review Session
- Replies: 71
- Views: 5464
Re: ENDGAME Review Session
Seriously so helpful, Lyndon for the win
- Sat Mar 14, 2020 6:38 pm
- Forum: General Science Questions
- Topic: Chemistry Final
- Replies: 16
- Views: 1139
Re: Chemistry Final
I'm hoping its more MC than usual just because of the way we have to type our answers
- Sat Mar 14, 2020 6:34 pm
- Forum: General Science Questions
- Topic: Who makes the Final
- Replies: 23
- Views: 1354
Re: Who makes the Final
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 :)
- Sat Mar 14, 2020 6:32 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chem Community Posts Due Date
- Replies: 13
- Views: 1079
Re: Chem Community Posts Due Date
BritneyP- 2c wrote:Last chem community post ever!
LOL, congrats! Good luck on the final :)
- Sat Mar 14, 2020 6:21 pm
- Forum: Student Social/Study Group
- Topic: Thoughtful Poetry Time
- Replies: 3
- Views: 520
Re: Thoughtful Poetry Time
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
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
- Sat Mar 14, 2020 6:13 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: n in NFE
- Replies: 64
- Views: 2906
Re: n in NFE
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...
- Sat Mar 14, 2020 6:02 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chem Community Posts Due Date
- Replies: 13
- Views: 1079
Chem Community Posts Due Date
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?
- Sat Mar 14, 2020 5:58 pm
- Forum: Student Social/Study Group
- Topic: Curve?
- Replies: 50
- Views: 6014
Re: Curve?
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
- Sat Mar 14, 2020 5:54 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final- general questions
- Replies: 12
- Views: 857
Re: Final- general questions
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...
- Sat Mar 14, 2020 5:50 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 512400
Re: Saying Thank You to Dr. Lavelle
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...
- Sat Mar 14, 2020 5:42 pm
- Forum: Administrative Questions and Class Announcements
- Topic: final exam - question
- Replies: 6
- Views: 653
Re: final exam - question
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...
- Sat Mar 14, 2020 5:35 pm
- Forum: Student Social/Study Group
- Topic: Coronavirus Joke
- Replies: 14
- Views: 1757
Re: Coronavirus Joke
HAHA, I didn't know where this was going but I like it
- Fri Mar 06, 2020 12:58 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Standard Potentials
- Replies: 4
- Views: 304
Re: Standard Potentials
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?
- Fri Mar 06, 2020 12:56 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Favoring reactions
- Replies: 7
- Views: 551
Re: Favoring reactions
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...
- Fri Mar 06, 2020 12:51 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Concentration Cells
- Replies: 5
- Views: 403
Re: Concentration Cells
So concentration cells always have a standard potential of 0V?
- Thu Mar 05, 2020 9:46 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6M.1
- Replies: 1
- Views: 146
Re: 6M.1
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!
I was also confused by this, since the solution manual rewrites the cell notation, but hopefully this helps!
- Wed Feb 12, 2020 3:26 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Multistep reactions
- Replies: 6
- Views: 377
Re: Multistep reactions
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...
- Wed Feb 12, 2020 1:32 am
- Forum: Calculating Work of Expansion
- Topic: Midterm equation sheet
- Replies: 16
- Views: 680
Re: Midterm equation sheet
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
- Wed Feb 12, 2020 1:15 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Multistep reactions
- Replies: 6
- Views: 377
Re: Multistep reactions
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...
- Wed Feb 12, 2020 1:06 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Multistep reactions
- Replies: 6
- Views: 377
Re: Multistep reactions
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(...
- Sun Feb 09, 2020 5:40 pm
- Forum: Student Social/Study Group
- Topic: Lost Stylus @ Pizza Rolls session
- Replies: 1
- Views: 147
Lost Stylus @ Pizza Rolls session
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...
- Sat Feb 08, 2020 11:12 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Grading
- Replies: 7
- Views: 223
Re: Grading
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...
- Sat Feb 08, 2020 11:05 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 1 Distribution
- Replies: 9
- Views: 298
Re: Test 1 Distribution
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!
- Sat Feb 08, 2020 10:57 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Pizza Rolls REVIEW Session DOWNLOAD HERE
- Replies: 67
- Views: 5489
Re: Pizza Rolls REVIEW Session DOWNLOAD HERE
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?
- Sun Jan 26, 2020 11:40 pm
- Forum: Student Social/Study Group
- Topic: Office Hours
- Replies: 5
- Views: 331
Re: Office Hours
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?
- Sun Jan 26, 2020 11:38 pm
- Forum: Student Social/Study Group
- Topic: Study websites besides quizlet
- Replies: 3
- Views: 325
Re: Study websites besides quizlet
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
- Sun Jan 26, 2020 11:32 pm
- Forum: Student Social/Study Group
- Topic: Class Grading
- Replies: 44
- Views: 3509
Re: Class Grading
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...
- Sun Jan 26, 2020 11:27 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2961503
Re: Post All Chemistry Jokes Here
Be like a proton and stay positive, folks :)
- Sun Jan 26, 2020 11:22 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2961503
Re: Post All Chemistry Jokes Here
For all my bilinguals out there:
Is Silicone the same in Spanish?
.
.
.
Si.
Is Silicone the same in Spanish?
.
.
.
Si.
- Sun Jan 26, 2020 11:12 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Practice Test
- Replies: 2
- Views: 121
Practice Test
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!
- Fri Jan 17, 2020 12:58 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: 6B.3 PART B HELP
- Replies: 4
- Views: 221
Re: 6B.3 PART B HELP
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...
- Fri Jan 17, 2020 12:57 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: 6B.3 PART B HELP
- Replies: 4
- Views: 221
Re: 6B.3 PART B HELP
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!
- Thu Jan 16, 2020 10:44 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: 6B.3 PART B HELP
- Replies: 4
- Views: 221
6B.3 PART B HELP
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...