Search found 199 matches
- Mon Mar 15, 2021 12:19 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Final
- Replies: 1
- Views: 261
Re: Final
Hey! Hmm, the final was this morning, hopefully you got to take it!
- Sun Mar 14, 2021 1:25 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Grades
- Replies: 19
- Views: 1371
Final Grades
Hi! Does anyone know when final grades will be released? :)
- Sun Mar 14, 2021 8:04 am
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: 6N.13 e^ln
- Replies: 3
- Views: 292
Re: 6N.13 e^ln
Yep!
- Sat Mar 13, 2021 11:37 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Thermodynamics and Kinetics
- Replies: 3
- Views: 307
Re: Thermodynamics and Kinetics
Hi! I believe that thermodynamics refers to the behavior and equilibrium of a system, while kinetics refers to the rate and the pathway at which a particular process will occur. Hope this helps!
- Sat Mar 13, 2021 11:33 pm
- Forum: Van't Hoff Equation
- Topic: Test
- Replies: 10
- Views: 742
Re: Test
Jacob Schwarz-Discussion 3I wrote:Is this referring to the final or the 2nd midterm????
I'm not exactly sure, I know in past years, the class was structured differently (with tests in addition to the midterm). Regardless, the final covers more than this! I would check the outlines to double check which sections are covered :)
- Sat Mar 13, 2021 11:29 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Spontaneity
- Replies: 57
- Views: 3015
Re: Spontaneity
When delta G=negative, the reaction is spontaneous!
- Sat Mar 13, 2021 1:45 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Constants Sheet
- Replies: 9
- Views: 557
Re: Constants Sheet
My TA let us highlight for the constants and equation sheet for the last midterm, but as everyone else has said, I would recommend confirming with your TA first.
- Sat Mar 13, 2021 11:55 am
- Forum: Student Social/Study Group
- Topic: Textbook Q on the Exam
- Replies: 3
- Views: 253
Re: Textbook Q on the Exam
In the Final Information PDF on the website, Dr. Lavelle did not say how many textbook problems would be on the final unfortunately :(
- Sat Mar 13, 2021 11:51 am
- Forum: *Electrophiles
- Topic: Is F a electrophile or nucleophile?
- Replies: 16
- Views: 2833
Re: Is F a electrophile or nucleophile?
Maybe this is a silly question, but when did we learn this?
- Sat Mar 13, 2021 11:23 am
- Forum: General Rate Laws
- Topic: Exercise 7C Question 5
- Replies: 3
- Views: 291
Re: Exercise 7C Question 5
Hi! I believe because part b is just asking for the rate law of each elementary step, the rate law will just be based off of the coefficients of the reactants (in this case 1).
- Sat Mar 13, 2021 11:09 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Effect of pH
- Replies: 3
- Views: 224
Re: Effect of pH
Hi! I think if OH- increases, the pH increases, and the rate decreases (because [OH-] is in the denominator.
- Sat Mar 13, 2021 12:04 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Problem with change in temperature and pressure
- Replies: 5
- Views: 371
Re: Problem with change in temperature and pressure
Yes! You are correct! You have to solve for them each separately, then add them together.
- Sat Mar 13, 2021 12:03 am
- Forum: Student Social/Study Group
- Topic: Spring Quarter
- Replies: 60
- Views: 2944
Re: Spring Quarter
I'm taking 14BL! I couldn't get into 14C :/
- Sat Mar 13, 2021 12:01 am
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Textbook 6.65
- Replies: 3
- Views: 239
Re: Textbook 6.65
I don't think so... This is what the solutions manual says:
- Fri Mar 12, 2021 11:49 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Shorthand with more than 4 molecules
- Replies: 2
- Views: 192
Re: Shorthand with more than 4 molecules
Sorry, could you clarify what you mean by this? 4 molecules in the overall shorthand notation?
- Fri Mar 12, 2021 11:46 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Electromotive Force
- Replies: 3
- Views: 418
Re: Electromotive Force
Are there any examples of problems with this concept that we will be required to know for the final?
- Fri Mar 12, 2021 11:45 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Textbook 6.65
- Replies: 3
- Views: 239
Re: Textbook 6.65
I think they set K=[H+]/[OH-] because when the pH is equal to 7, both [H+] and [OH-] are equal to 1.0x10^7M
- Fri Mar 12, 2021 12:38 am
- Forum: Student Social/Study Group
- Topic: STEM Clubs!
- Replies: 7
- Views: 690
Re: STEM Clubs!
Hi Claire! I am in AMWA and Rewritten, both of which are really great clubs! I've also wonderful things about UAEM, MedReach and AIM! I hope this helps :) Sending good vibes for your studies this weekend. I'm in MedReach, and I love it! We do outreach to local high schools to educate students about...
- Fri Mar 12, 2021 12:36 am
- Forum: Student Social/Study Group
- Topic: STEM Clubs!
- Replies: 7
- Views: 690
Re: STEM Clubs!
805295074 wrote:Hey! I'm apart of YMAA (youth movement against Alzheimer's) and MEDLIFE EAch are a lot of fun and MEDLIFE has trip every year to Peru to help the communities there!
I'm in MEDLIFE too, I love it!
- Fri Mar 12, 2021 12:11 am
- Forum: Student Social/Study Group
- Topic: Doubts about Pre-Med or Pre-Professional School
- Replies: 17
- Views: 968
Doubts about Pre-Med or Pre-Professional School
Hi y'all, I just thought I would make this post to see if anyone else is feeling a similar way and how they approach that feeling! As a pre-med freshman, everything being virtual, these past two quarters have been ~rough~ for me, I worry about future UCLA classes and sometimes I doubt if medical sch...
- Thu Mar 11, 2021 11:50 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Exam Questions
- Replies: 15
- Views: 848
Re: Final Exam Questions
Hi! Do we know how many questions will be on the final exam?
- Wed Mar 10, 2021 11:32 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Ignoring second deprotonations
- Replies: 5
- Views: 596
Re: Ignoring second deprotonations
I was also wondering this! It seems as if some problems ignore the first deprotonation, while some ignore the second deprotonation (unless I am misinterpreting them). So if anyone knows the answer, it would be greatly appreciated :)
- Sun Mar 07, 2021 9:46 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Q Calculations
- Replies: 21
- Views: 936
Re: Q Calculations
mmol means millimole; 1 mmol is equal to 0.001 mol!
- Sun Mar 07, 2021 9:43 pm
- Forum: Van't Hoff Equation
- Topic: Test
- Replies: 10
- Views: 742
Re: Test
I think the original post was from last winter, when the class was structured a bit differently (with more tests)!
- Sun Mar 07, 2021 12:57 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Textbook 7.9
- Replies: 2
- Views: 160
Re: Textbook 7.9
^I am also confused on how to do this problem, if someone could explain, that would be great :)
- Sat Mar 06, 2021 6:20 pm
- Forum: Second Order Reactions
- Topic: Textbook question 7B.13
- Replies: 2
- Views: 200
Re: Textbook question 7B.13
^I'm struggling with this one as well. If someone could explain, that would be great :)
- Sat Mar 06, 2021 2:45 pm
- Forum: Administrative Questions and Class Announcements
- Topic: [CHEM 14B KARAOKE]
- Replies: 68
- Views: 5728
Re: [CHEM 14B KARAOKE]
We're using this Zoom link now: https://ucla.zoom.us/j/92410197271?pwd= ... tFbUtkdz09
Join!!!
Join!!!
- Sat Mar 06, 2021 2:45 pm
- Forum: Administrative Questions and Class Announcements
- Topic: [CHEM 14B KARAOKE]
- Replies: 68
- Views: 5728
Re: [CHEM 14B KARAOKE]
Sable Summerfield wrote:Charlotte Adams 1A wrote:Is it still from 2-4?
Also, If I am a little late can I still participate?
Yes join!!
- Sat Mar 06, 2021 1:21 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Video Review
- Replies: 8
- Views: 480
Re: Video Review
I love the Organic Chemistry Tutor on Youtube! Super helpful :)
- Fri Mar 05, 2021 11:13 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6O.3 Question
- Replies: 4
- Views: 508
Re: 6O.3 Question
Electrolysis is the process in which an electric current is used to create a chemical change. It helps me to remember that the suffix -lysis means "breaking up." Electrolysis is breaking something up with electricity, hydrolysis is breaking something up using water (commonly seen when wor...
- Fri Mar 05, 2021 11:12 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Textbook problem 6.45
- Replies: 3
- Views: 194
Re: Textbook problem 6.45
Hi! I am confused on which reduction potentials values and half reactions to use. Since not all half reactions for each substance have the same amount electrons transferred, which do we use? I thought that you could choose the half reaction, as long as the amount of electrons transferred is the same...
- Fri Mar 05, 2021 10:00 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6O.3 Question
- Replies: 4
- Views: 508
Re: 6O.3 Question
Can someone explain what electrolyzed means in this context and why it is relevant to the problem?
- Fri Mar 05, 2021 8:19 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6N.17 Textbook Question
- Replies: 3
- Views: 639
Re: 6N.17 Textbook Question
For these types of problems, do we always assume the temperature is 298 K?
- Fri Mar 05, 2021 8:12 pm
- Forum: Administrative Questions and Class Announcements
- Topic: DAYLIGHT SAVINGS TIME!
- Replies: 12
- Views: 1326
Re: DAYLIGHT SAVINGS TIME!
Just bringing this post back, except the date of the final will be Sunday, March 14th. Make sure you are aware of Daylight Savings!!
- Fri Mar 05, 2021 8:10 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 10 Review Sessions
- Replies: 10
- Views: 507
Re: Week 10 Review Sessions
Does anyone have any recommended review sessions? I've only been to a few of the same peoples and I was wondering if anyone stood out to you guys specifically in terms of covering the most content? Honestly, all of the TAs and UAs are awesome, I would recommend choosing the review sessions for topi...
- Thu Mar 04, 2021 8:34 am
- Forum: Student Social/Study Group
- Topic: Playlist
- Replies: 86
- Views: 6298
Re: Playlist
Kelly Singh wrote:Hannah_Kim_1I wrote:Rocky by Still Woozy!
he is SO good
I LOVE Still Woozy! He's amazing!!
- Thu Mar 04, 2021 8:29 am
- Forum: Student Social/Study Group
- Topic: What organizations are you guys in?
- Replies: 53
- Views: 3005
Re: What organizations are you guys in?
I'm in a few different organizations! I'm involved in Greek life, PUMP (Pre-med Undergrad Mentorship Program), MedReach, She's the First, MEDLIFE, and an intern for USAC! If anyone has any questions about any of these or is thinking about getting involved, I would love to talk :)
- Thu Mar 04, 2021 8:27 am
- Forum: Student Social/Study Group
- Topic: What organizations are you guys in?
- Replies: 53
- Views: 3005
Re: What organizations are you guys in?
I'm in a few different orgs! I'm a part of GlobeMed and Project RISHI, which are both global health organizations but have very different takes on how to approach health. I'm also in HOSA and CaHPSA, which are pre-med orgs. How is GlobeMed? It sounds really interesting! I'm definitely considering a...
- Sun Feb 28, 2021 10:29 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Final
- Replies: 15
- Views: 780
Re: Final
Does the time for the final depend on your lecture or is it one time for all lectures like Chem 14A?
- Sun Feb 28, 2021 10:27 pm
- Forum: Student Social/Study Group
- Topic: Points Required for Full Credit of Chem Community
- Replies: 11
- Views: 863
Re: Points Required for Full Credit of Chem Community
I already have 50 points on myUCLA, but I'm not sure. I'm going to keep posting because I don't want to risk it haha!
- Sun Feb 28, 2021 10:20 pm
- Forum: Administrative Questions and Class Announcements
- Topic: [CHEM 14B KARAOKE]
- Replies: 68
- Views: 5728
Re: [CHEM 14B KARAOKE]
I'll be there! Will Dr. Lavelle be there too? :)
- Sun Feb 28, 2021 10:15 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Anodes and Cathodes
- Replies: 22
- Views: 967
Re: Anodes and Cathodes
I like to remember it as:
AN OX (anode--oxidation)
RED CAT (reduction--cathode)
AN OX (anode--oxidation)
RED CAT (reduction--cathode)
- Sun Feb 28, 2021 1:34 pm
- Forum: Balancing Redox Reactions
- Topic: Sapling #5
- Replies: 9
- Views: 536
Re: Sapling #5
For this question, I had the right equation, but Sapling was saying it was incorrect. So I changed the order of the species and got it right. Maybe change the order of your reaction to see if that will help?
- Sun Feb 28, 2021 1:31 pm
- Forum: Student Social/Study Group
- Topic: Points needed to pass?
- Replies: 76
- Views: 6652
Re: Points needed to pass?
Taylor Newville 1C wrote:Does he offer extra credit?
Unfortunately, he typically does not offer extra credit :( The only "extra credit" available will be on exams in the form of bonus questions, I believe.
- Sun Feb 28, 2021 12:07 pm
- Forum: Balancing Redox Reactions
- Topic: Sapling wk 7/8 #5 part 2
- Replies: 3
- Views: 202
Re: Sapling wk 7/8 #5 part 2
I am also struggling with this problem, if someone could explain how they balanced the overall equation, that would be great! I keep getting the wrong answer :(
- Thu Feb 25, 2021 10:26 pm
- Forum: Student Social/Study Group
- Topic: Anxiety
- Replies: 109
- Views: 6892
Re: Anxiety
I have a lot of anxiety when it comes to this class and taking exams in general, and I find it relieving to talk to family and friends to take a break from studying!
- Thu Feb 25, 2021 8:58 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Sapling #9, Week 7/8
- Replies: 8
- Views: 461
Re: Sapling #9, Week 7/8
Relating to this question and standard reduction potentials, conceptually, why does the half reaction with the larger standard reduction potential occur at the cathode?
- Sun Feb 21, 2021 11:56 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: State property
- Replies: 47
- Views: 3480
Re: State property
Adding on to the above reply, a state function does not depend on the path taken. A path function (work and heat) depends on the path taken!
- Sun Feb 21, 2021 5:48 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Tips for Concentrating during a test
- Replies: 31
- Views: 1150
Re: Tips for Concentrating during a test
A similar question: how do you not freak out when you see questions on the test that you don't know how to do? I struggle with this because when I see a question that I am not sure to do, I tend to get distracted. Does anyone have any tips?
- Sun Feb 21, 2021 12:06 pm
- Forum: General Science Questions
- Topic: MT 2 grades
- Replies: 34
- Views: 1737
Re: MT 2 grades
I don't know for sure, but it typically takes about a week!
- Sun Feb 21, 2021 10:20 am
- Forum: Student Social/Study Group
- Topic: Post Midterm 2 De-stressing
- Replies: 92
- Views: 6127
Re: Post Midterm 2 De-stressing
I plan on getting a lot of sleep this weekend and catching up on episodes of The Bachelor that I am behind on! Other than that, last night I treated myself by baking chocolate chip cookies :) I caught up on the Bachelor too! It's such a ridiculous show, but makes me forget about the stresses of sch...
- Thu Feb 18, 2021 5:19 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Office Hours 2/19
- Replies: 5
- Views: 295
Office Hours 2/19
I saw that Dr. Lavelle mentioned office hours tomorrow in the email he sent earlier, just to confirm: the TA office hours listed in the email will be happening? I've noticed that typically TAs don't host office hours on the day of the exams because they have to proctor for their discussion sections....
- Wed Feb 17, 2021 5:29 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Textbook 4.23 Quantum Content
- Replies: 2
- Views: 159
Textbook 4.23 Quantum Content
Textbook question 4.23 has content from the quantum section of 14A, should we be pretty comfortable with these concepts for the midterm as well? Do you think there is a chance we would be tested on a problem requiring quantum content?
- Wed Feb 17, 2021 5:24 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Textbook Focus Questions Thermochemistry
- Replies: 3
- Views: 179
Re: Textbook Focus Questions Thermochemistry
I definitely agree. The focus problems felt a lot more complex than the other ones. I also feel like he usually pulls one or two complex ones from the textbook, so unfortunately, I would be familiar with these since they are on the outline :/
- Wed Feb 17, 2021 12:22 am
- Forum: Calculating Work of Expansion
- Topic: 4.7
- Replies: 5
- Views: 461
Re: 4.7
Hi! For part a, first, write the balanced equation for the reaction, which is C6H6 + 15/2O2--> 6CO2 + 3H2O, then use the equation w=-P∆V=-∆nRT to solve for work. Next, find the change in moles of gas (moles of gas in the products-moles gas in reactants), and plug this into the equation w=-∆nRT, alon...
- Tue Feb 16, 2021 11:38 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Textbook problem 4.45
- Replies: 2
- Views: 202
Re: Textbook problem 4.45
For this problem, for part d, the answer key says the entropy change of the surroundings is primarily a result of the dispersal of thermal motion. Can someone please explain this? :/ Thanks!
- Mon Feb 15, 2021 11:13 pm
- Forum: Administrative Questions and Class Announcements
- Topic: cc update
- Replies: 23
- Views: 1079
Re: cc update
Do the posts correspond exactly to timing (like if you don't have the exact amount each sunday you miss the 5 points) or is it more based on the ultimate amount you have posted? Last quarter it really depended on the TA! I would try to complete each 5 by the due date just to be sure. If you're conc...
- Mon Feb 15, 2021 1:51 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: 4H.1 part d
- Replies: 4
- Views: 261
Re: 4H.1 part d
Why does disorder increase when volume increases? Because the substance occupies a larger volume?
- Sun Feb 14, 2021 3:38 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Sapling Wk 5/6 #12
- Replies: 2
- Views: 187
Re: Sapling Wk 5/6 #12
Hi! So I would start off by looking at the equation ∆G=∆H-T∆S. If ∆G is negative, the process is spontaneous. If it is positive, the process is nonspontaneous. Use this information to determine which signs of ∆H and ∆S will make ∆G positive or negative. Hope this helps! Feel free to respond with ano...
- Sun Feb 14, 2021 3:33 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Sapling wk 5/6 #3
- Replies: 3
- Views: 153
Re: Sapling wk 5/6 #3
Hi! I'm not sure if this answers your question, but the problem is asking how ∆H and ∆S change when changing phases. For example, when a substance changes phases from a solid to a liquid, how do ∆H and ∆S change?
- Sun Feb 14, 2021 3:23 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: Change in entropy
- Replies: 6
- Views: 432
Re: Change in entropy
To calculate ∆S, you use the equation ∆S=-∆Hsys/T. The Sapling prompt should give you a value for ∆H, and you just divide this by the temperature given in Kelvin.
- Sun Feb 14, 2021 3:18 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Sapling 5/6 #19
- Replies: 4
- Views: 259
Re: Sapling 5/6 #19
Adding onto the previous post, you will also need to convert the value for R (8.314 J/K*mol) to be in the units kJ/K*mol because the standard change in Gibbs free energy is given in kJ/mol! This is where I kept messing up on my Sapling, so I would double check that the units match :)
- Sun Feb 14, 2021 11:48 am
- Forum: Van't Hoff Equation
- Topic: Van't Hoff equation mistake?
- Replies: 6
- Views: 420
Re: Van't Hoff equation mistake?
I'm very confused as well. I looked it up and saw both versions, so I'm not sure what the correct version is. If anyone knows, please share!!
- Sun Feb 14, 2021 11:45 am
- Forum: Administrative Questions and Class Announcements
- Topic: TA Office Hours 2/15
- Replies: 4
- Views: 272
Re: TA Office Hours 2/15
Great, thank you all!! :)
- Sat Feb 13, 2021 8:35 pm
- Forum: Administrative Questions and Class Announcements
- Topic: TA Office Hours 2/15
- Replies: 4
- Views: 272
TA Office Hours 2/15
Will any TA office hours be held on Monday 2/15?
- Fri Feb 12, 2021 11:10 am
- Forum: Administrative Questions and Class Announcements
- Topic: Lecture #16 Error
- Replies: 6
- Views: 318
Lecture #16 Error
Is anyone else having trouble playing Lecture #16? I keep getting an error when I try to watch :(
- Wed Feb 10, 2021 8:57 pm
- Forum: Administrative Questions and Class Announcements
- Topic: MyUCLA Grade
- Replies: 27
- Views: 1365
Re: MyUCLA Grade
The same thing happened to me, but then all of my scores showed again this afternoon! I wouldn't worry about it :)
- Sun Feb 07, 2021 8:37 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Spontaneous change
- Replies: 3
- Views: 99
Re: Spontaneous change
I don't think exothermic reactions are always spontaneous? I'm pretty sure it also depends on the temperature and the entropy as well.
- Sun Feb 07, 2021 8:29 pm
- Forum: Student Social/Study Group
- Topic: Midterm 2 study tips
- Replies: 26
- Views: 1221
Re: Midterm 2 study tips
For anyone who assigned the step up sessions, would you guys recommend doing this? How helpful were they with preparing you for the midterm? I highly recommend UA sessions, especially if you are struggling to get a grasp on the material. Step Up sessions are great for a walk through of concepts and...
- Sun Feb 07, 2021 8:26 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Photo in Lecture
- Replies: 1
- Views: 69
Re: Photo in Lecture
The arrows are pointing to which is spontaneous vs not spontaneous (so the top image is not spontaneous, while the second one is). I believe what this image is describing, is that once you open the valve of the gas, we see in the second image, that the gas expands and occupies more volume (we see th...
- Fri Feb 05, 2021 9:37 pm
- Forum: Administrative Questions and Class Announcements
- Topic: tips if you're struggling!
- Replies: 77
- Views: 4396
Re: tips if you're struggling!
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 ti...
- Fri Feb 05, 2021 9:34 pm
- Forum: Ideal Gases
- Topic: Chem BL
- Replies: 107
- Views: 7140
Re: Chem BL
I'm currently taking 14B, planning to take BL next quarter and take a break from regular chemistry classes and take chem14c starting fall next year (fingers crossed it'll be in person) I'm doing the same thing! Does anyone know if it's difficult to secure a spot in 14BL? I wondering if I should enr...
- Thu Feb 04, 2021 5:12 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Sapling Weeks 3 and 4 HW Question 15
- Replies: 4
- Views: 192
Re: Sapling Weeks 3 and 4 HW Question 15
I keep getting the wrong answer for this question :( How do you calculate the volume change for this problem since we have to solve for volume using PV=nRT and not another volume is given?
- Thu Feb 04, 2021 4:36 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Sapling Week 3 and 4 Question 14
- Replies: 7
- Views: 267
Re: Sapling Week 3 and 4 Question 14
Should n equal PV/RT, not RT/PV? Since to isolate n you need to divide PV by RT, not the other way around.
- Thu Feb 04, 2021 4:31 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Sapling Weeks 3,4,5 Grade Error
- Replies: 4
- Views: 270
Re: Sapling Weeks 3,4,5 Grade Error
I agree with the comments above! It typically takes a little while, I've noticed, for the CCLE grade to update, so I wouldn't worry too much about it! If it's been a couple of days and it still has not updated, then I would reach out to your TA.
- Sun Jan 31, 2021 10:58 pm
- Forum: Student Social/Study Group
- Topic: Midterm Grades
- Replies: 15
- Views: 641
Re: Midterm Grades
It typically takes about a week! And last quarter I found my grades under the "Exam and Homework Grades" tab on MyUCLA (but I'm pretty sure it's also posted on CCLE)!
- Sun Jan 31, 2021 10:57 pm
- Forum: Student Social/Study Group
- Topic: Congrats!!
- Replies: 21
- Views: 945
Re: Congrats!!
Congrats everyone! Good luck on the rest of your midterms!! We're gonna be so prepared for Midterm 2 :)
- Sun Jan 31, 2021 10:56 pm
- Forum: Student Social/Study Group
- Topic: Study Habits Part 2
- Replies: 16
- Views: 587
Re: Study Habits Part 2
Thank you for sharing! :) I also highly recommend going to UA workshops, it is SO helpful to stay up to speed with current content (and make sure you are keeping up with the pace)! And completing textbook problems while we learn the content (instead of waiting until right before the midterm) is anot...
- Sun Jan 31, 2021 10:51 pm
- Forum: General Science Questions
- Topic: Midterm 1 Reactions
- Replies: 70
- Views: 4173
Re: Midterm 1 Reactions
I agree with most of what's been said above! I finished a bit early, so I had some time to go over my answers, but ended up overthinking all of them (leading to changing a couple answers) which I think is going to end up harming my grade :(
- Sun Jan 31, 2021 10:47 pm
- Forum: Student Social/Study Group
- Topic: Go treat yourself after MT1!
- Replies: 75
- Views: 4244
Re: Go treat yourself after MT1!
Mariah Disc 2C wrote:Love this thread! I treated myself with some ice cream!
Yes, I treated myself to some ice cream too! Coconut milk chocolate ice cream from Trader Joes to be specific, I'd highly recommend for any Westwood people :)
- Fri Jan 29, 2021 1:28 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Enthalpy of Formation vs Enthalpy of Combustion
- Replies: 2
- Views: 155
Enthalpy of Formation vs Enthalpy of Combustion
Hi! Can someone tell me if the formula (products-reactants) is the same for calculating enthalpy of combustion as it is for enthalpy of formation?
- Wed Jan 27, 2021 3:34 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Office Hours on 1/29
- Replies: 1
- Views: 47
Office Hours on 1/29
Hi! Will there be any TA office hours on Friday, the day of the midterm, for any last minute questions?
- Mon Jan 25, 2021 10:44 pm
- Forum: Student Social/Study Group
- Topic: Midterm: Outline 3
- Replies: 2
- Views: 83
Re: Midterm: Outline 3
Yeah, I agree. Dr. Lavelle hasn't explicitly told us, but I would say bullet points 1-7, as well as bullet points 11 and 19 will probably be best to know for the midterm.
- Mon Jan 25, 2021 10:41 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Sapling #8
- Replies: 7
- Views: 475
Re: Sapling #8
So for part c (or the last question), you will want to use the equation you listed (but use CS2 instead of S8): ΔH=nCS2×ΔH∘ Since 399 kJ of heat is absorbed, this will be the value for ΔH. Then use the value of ΔH∘ given in the problem, which is +358.8, and divide this by 4 because there are 4 moles...
- Mon Jan 25, 2021 10:27 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Sapling #8
- Replies: 7
- Views: 475
Re: Sapling #8
I'm working on this problem right now, and I'm still trying to figure out part c. but for part b., you need to convert the 173 g to moles, then from there you multiply that value times the delta H value divided by 4 (because there are 4 moles of carbon in the reaction). Hope that helps! When I figur...
- Sun Jan 24, 2021 11:22 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Textbook Problem 5I.3
- Replies: 2
- Views: 93
Textbook Problem 5I.3
I got a different answer than the solutions manual for this question, can someone explain how they did this problem? How did you calculate Kc? Thanks in advance! :)
- Sun Jan 24, 2021 11:09 pm
- Forum: Student Social/Study Group
- Topic: Favorite Music
- Replies: 113
- Views: 9823
Re: Favorite Music
StephanieGrigorian2J wrote: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 :)
We have like the same music taste, that's awesome :)
- Sun Jan 24, 2021 9:27 pm
- Forum: Phase Changes & Related Calculations
- Topic: outline 3: thermochemistry
- Replies: 3
- Views: 125
Re: outline 3: thermochemistry
Does anyone know if this has been confirmed? Or if Dr. Lavelle has said anything about how much of Outline 3 will be tested on Midterm 1?
- Sun Jan 24, 2021 9:24 pm
- Forum: Student Social/Study Group
- Topic: CHEM 14B Midterm 1 Notes
- Replies: 23
- Views: 1079
Re: CHEM 14B Midterm 1 Notes
This is so nice of you to share, and it'll be really helpful when studying! Thank you so much :)
- Sun Jan 24, 2021 9:22 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Periodic Tables on Midterm
- Replies: 23
- Views: 807
Re: Periodic Tables on Midterm
Midterms for 14A were not open book, they were proctored using Respondus and over Zoom! If you go to Dr. Lavelle's 14B class website, there is a link to the constants and equations sheet and the periodic table, which we are allowed to have on all tests! Here's what it looks like:
- Sun Jan 24, 2021 9:19 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Testing schedule/format?
- Replies: 11
- Views: 442
Re: Testing schedule/format?
Does anyone know how many questions there will be on the midterm and how many points each question will be worth? This midterm is worth less than the midterms in 14A, so I'm just curious what the change in distribution of points will be! I'm hoping each question will be worth less, as opposed to hav...
- Sun Jan 24, 2021 12:32 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Tutoring? [ENDORSED]
- Replies: 121
- Views: 240607
Re: Tutoring? [ENDORSED]
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...
- Sun Jan 24, 2021 12:27 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Textbook Problem 4D. 15
- Replies: 2
- Views: 163
Re: Textbook Problem 4D. 15
I also had trouble with this one. The explanation above makes sense, thank you! But I was also confused on how we would write the equations that are listed in the solutions manual. Can anyone explain this?
- Fri Jan 22, 2021 4:20 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Textbook Solutions Not Appearing
- Replies: 7
- Views: 181
Re: Textbook Solutions Not Appearing
Thank you so much, this was so helpful! I did not even know you could download the solutions manual (and they give you steps to solve the problems, which is even better!)
- Fri Jan 22, 2021 10:54 am
- Forum: Administrative Questions and Class Announcements
- Topic: Textbook Solutions Not Appearing
- Replies: 7
- Views: 181
Textbook Solutions Not Appearing
I've recently had an issue with my textbook solutions not appearing. I've tried refreshing the page, and staying on the page to see if maybe they just need more time to load, but nothing has worked. Has anyone had this issue before or have any advice on how to fix it? It's quite frustrating that I c...
- Mon Jan 18, 2021 4:33 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Textbook #6A.19
- Replies: 3
- Views: 103
Re: Textbook #6A.19
Can someone explain how they worked through this problem? I'm not getting the right answer :(
- Sun Jan 17, 2021 11:53 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Tutoring? [ENDORSED]
- Replies: 121
- Views: 240607
Re: Tutoring? [ENDORSED]
For the chemistry fraternity, Alpha Chi Sigma, does anyone know when they start offering tutoring? Is it week 3?
- Sun Jan 17, 2021 11:51 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: When to use ICE chart?
- Replies: 10
- Views: 590
Re: When to use ICE chart?
Yes, I agree with the post above. A good way that I use to determine if an ICE table is necessary, is to look for key words "initial concentration" and "equilibrium concentration", and usually that will give you a pretty good hint if an ICE table is necessary.
- Sun Jan 17, 2021 10:28 pm
- Forum: Student Social/Study Group
- Topic: Chemistry Community Posts
- Replies: 22
- Views: 849
Re: Chemistry Community Posts
I think it generally depends on the leniency of the TA. I think it's probably safe to try and stick to 5 per week, but I would recommend emailing your TA for clarification!
- Sun Jan 17, 2021 10:26 pm
- Forum: Student Social/Study Group
- Topic: Exercising Our Minds and Bodies
- Replies: 120
- Views: 15243
Re: Exercising Our Minds and Bodies
I love to hike and go for runs to destress! I've also recently gotten into yoga, which is a great way to be active while also being relaxed!