Search found 100 matches
- Sat Mar 13, 2021 5:34 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: week 9/10 sampling #20
- Replies: 2
- Views: 203
week 9/10 sampling #20
I've tried to do this problem many times but I can't seem to get the correct answer. Can someone walk me through the steps of the problem? Thank you! The presence of a catalyst provides a reaction pathway in which the activation energy of a reaction is reduced by 49.00 kJ⋅mol−1 . Uncatalyzed: A⟶B Ea...
- Sat Mar 13, 2021 1:19 pm
- Forum: General Rate Laws
- Topic: Units for k
- Replies: 11
- Views: 793
Units for k
Can someone explain how to find the units of k? Does each order always have the same units or do we need to calculate it for each problem? Thank you!
- Fri Mar 12, 2021 5:20 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Reduction or oxidation
- Replies: 4
- Views: 333
Reduction or oxidation
When given a reaction, how do you determine what is being oxidized and what is being reduced?
- Fri Mar 12, 2021 5:17 pm
- Forum: General Rate Laws
- Topic: k vs K
- Replies: 6
- Views: 451
k vs K
Hi! Can someone explain the difference between k and K? Thank you!
- Fri Mar 12, 2021 5:15 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Resources for Final?
- Replies: 5
- Views: 351
Re: Resources for Final?
Like what was said above, Organic Chemistry Tutor is really good and also Professor Dave Explains on youtube is really helpful to me to get the basic concepts!
- Sun Mar 07, 2021 4:36 pm
- Forum: Administrative Questions and Class Announcements
- Topic: week 10 lectures?
- Replies: 15
- Views: 1002
Re: week 10 lectures?
I think that we'll be finishing the outlines by Wednesday, so Friday's lecture might just be a review!
- Sun Mar 07, 2021 4:29 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final on 3/13
- Replies: 18
- Views: 1008
Re: Final on 3/13
The final is on Sunday 03/14 from 9:30 am to 11:00 am!
- Thu Mar 04, 2021 4:40 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 9 Sapling
- Replies: 11
- Views: 718
Re: Week 9 Sapling
Yes, I think that Week 9 and Week 10 sampling are combined and is due friday of week 10 (03/12) instead of sunday!
- Tue Mar 02, 2021 10:20 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Step up vs workshops
- Replies: 18
- Views: 1191
Re: Step up vs workshops
I think that step up sessions go more step by step with the basics and concepts and workshops are more for if you understand the basics and want more review and help with solving problems.
- Tue Mar 02, 2021 10:15 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Access to accounts
- Replies: 10
- Views: 768
Re: Access to accounts
I'm not completely sure, but I was able to view different threads and posts on chem community even though I wasn't logged into my account, I just couldn't make any posts. And also, when I look up questions, sometimes a chem community post pops up as one of the top search results, so I think you will...
- Sat Feb 27, 2021 2:00 pm
- Forum: Administrative Questions and Class Announcements
- Topic: 14B final date and time?
- Replies: 9
- Views: 618
Re: 14B final date and time?
I'm pretty sure the final is March 14, the sunday before final's week from 9:30am to 11:00am. For 14a during the final, we all took it at the same time, but with our TA. So it'll probably be like the midterms where zoom links for the final will be posted for each TA, and you just join the zoom when ...
- Sat Feb 27, 2021 1:55 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: n in ∆G = -nFE
- Replies: 80
- Views: 5055
n in ∆G = -nFE
I know that n is the number of moles in the reaction. How are you supposed to find this out when given a chemical reaction? Thank you!
- Sat Feb 27, 2021 12:05 pm
- Forum: Balancing Redox Reactions
- Topic: Sampling 7/8 #1
- Replies: 3
- Views: 239
Sampling 7/8 #1
For the reaction KClO3⟶KCl+32O2 assign oxidation numbers to each element on each side of the equation. for KCLO3, i got K is 1 and O is -2, which sampling said is correct. I thought that it would make Cl have an oxidation number of 1, but that isn't correct. Can someone explain to me how to get the ...
- Thu Feb 25, 2021 9:10 pm
- Forum: Administrative Questions and Class Announcements
- Topic: 14BL over summer
- Replies: 2
- Views: 223
Re: 14BL over summer
I'm taking BL right now and the time commitment isn't too bad! The only major thing we have to do outside of class/lab time are lab reports, and we usually have the whole week to complete it. Although since it is only six weeks, there might be two a week or longer reports. But it is pretty manageabl...
- Wed Feb 24, 2021 11:49 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chem 14BL Enrollment
- Replies: 7
- Views: 799
Re: Chem 14BL Enrollment
I was on the waitlist for this quarter in one of the last spots and I got in, so I think you will most likely be able to get in!
- Fri Feb 19, 2021 5:07 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: H vs q
- Replies: 20
- Views: 967
H vs q
I am a little confused about the difference between H and q. I know that H is enthalpy and is a measure of heat, but how is that different from q?
- Thu Feb 18, 2021 2:22 am
- Forum: Administrative Questions and Class Announcements
- Topic: 2/19 lecture
- Replies: 6
- Views: 431
2/19 lecture
Just to make sure, there won't be a lecture posted this friday right?
- Thu Feb 18, 2021 2:17 am
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm 2 and Final
- Replies: 25
- Views: 1414
Re: Midterm 2 and Final
Yes, I think that it will all be proctored the same way!
- Wed Feb 17, 2021 9:42 pm
- Forum: Administrative Questions and Class Announcements
- Topic: MIDTERM 2
- Replies: 9
- Views: 644
Re: MIDTERM 2
it from from lecture 9 to last friday (lecture 16)!
- Wed Feb 17, 2021 2:51 am
- Forum: Administrative Questions and Class Announcements
- Topic: 4D Textbook problems for Midterm 2
- Replies: 3
- Views: 244
Re: 4D Textbook problems for Midterm 2
We don't really know which specific problems are going to be on the midterm but if the problems in section 4D are listed in outline 3 or 4, I would definitely do them, just to make sure you understand all the topics that could possibly be covered in the test.
- Sun Feb 14, 2021 11:48 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Sampling #19
- Replies: 2
- Views: 178
Sampling #19
I'm not really sure where to start to solve this problem? Any help would be greatly appreciated! For a gaseous reaction, standard conditions are 298 K and a partial pressure of 1 bar for all species. For the reaction N2(g)+3H2(g)↽−−⇀2NH3(g) the standard change in Gibbs free energy is ΔG∘=−69.0 kJ/mo...
- Sun Feb 14, 2021 11:43 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Sampling 3/4 #12
- Replies: 3
- Views: 207
Re: Sampling 3/4 #12
Thank you!
- Sun Feb 14, 2021 11:41 pm
- Forum: Administrative Questions and Class Announcements
- Topic: struggling
- Replies: 73
- Views: 4603
Re: struggling
I feel the same way, I did all the assigned problems and still had a really hard time on the midterm. I think that step up sessions were helpful to me in grasping a lot of the concepts, and also watching youtube videos that explained the topics. Also, maybe going to office hours to review the midter...
- Sat Feb 13, 2021 9:29 pm
- Forum: Administrative Questions and Class Announcements
- Topic: tips if you're struggling!
- Replies: 77
- Views: 6033
Re: tips if you're struggling!
These are all really helpful! Thank youu!
- Fri Feb 12, 2021 3:23 pm
- Forum: Administrative Questions and Class Announcements
- Topic: UA Sessions: Midterm 2 Review
- Replies: 13
- Views: 812
Re: UA Sessions: Midterm 2 Review
Yes, they usually do reviews but I would attend multiple just to get review on all the material!
- Sun Feb 07, 2021 11:41 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Week 3/4 sampling #6
- Replies: 3
- Views: 200
Re: Week 3/4 sampling #6
Ahh that makes sense! Thank you!
- Sun Feb 07, 2021 11:40 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Sampling 3/4 #12
- Replies: 3
- Views: 207
Sampling 3/4 #12
At constant volume, the heat of combustion of a particular compound, compound A, is −3006.0 kJ/mol. When 1.569 g of compound A (molar mass =109.95 g/mol) is burned in a bomb calorimeter, the temperature of the calorimeter (including its contents) rose by 7.365 ∘C. What is the heat capacity (calorime...
- Sun Feb 07, 2021 9:28 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Week 3/4 sampling #6
- Replies: 3
- Views: 200
Week 3/4 sampling #6
For each reaction, identify another quantity that is equal to ΔH∘rxn. CH4(g)+2O2(g)⟶CO2(g)+2H2O(l) - 4×bond energy of C−H - enthalpy of formation of CO2(g) - enthalpy of combustion of CH4 - −4×bond energy of C−H Hi! Can someone explain how to do this problem? I don't really understand how to solve i...
- Fri Feb 05, 2021 12:01 am
- Forum: Administrative Questions and Class Announcements
- Topic: 14bl virtual or in person
- Replies: 13
- Views: 745
Re: 14bl virtual or in person
I'm doing 14BL right now and its not too much work. We just have 15 minute lectures to watch each week and indivudual lab reports due and well as worksheets to complete with our group during lab time. It does really suck not being able to have any hands on experience and only learning conceptually h...
- Fri Jan 29, 2021 1:36 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE table, when to divide by L
- Replies: 5
- Views: 237
Re: ICE table, when to divide by L
nevermind! I looked at the problem again and I get it now!
- Fri Jan 29, 2021 1:32 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE table, when to divide by L
- Replies: 5
- Views: 237
ICE table, when to divide by L
I was doing the textbook problems and I noticed that for some of the ICE tables in the calculations, they don't divide the moles by L while for other they do. I was wondering if anyone knew the difference for when to divide by L and when not to. Thank you!
- Thu Jan 28, 2021 9:19 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Textbook 5G.11, Q vs K
- Replies: 4
- Views: 448
Textbook 5G.11, Q vs K
Write the reaction quotient Q for (a) 2BCl3(g) + 2Hg(l) → B2Cl4(s) + Hg2Cl2(s) The answer in the solutions for this is 1 / BCl3^2. Can someone explain how they got this? I was also wondering if someone could explain what the difference is between Q and K and how to solve problems that ask for that. ...
- Tue Jan 26, 2021 9:38 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Lecture on 1/29?
- Replies: 6
- Views: 226
Re: Lecture on 1/29?
I got an email from my TA that said that discussion and lecture on 1/29 will be canceled!
- Tue Jan 26, 2021 9:35 pm
- Forum: Administrative Questions and Class Announcements
- Topic: MIDTERM Location
- Replies: 5
- Views: 231
Re: MIDTERM Location
There is a Midterm 1 section on CCLE and if you click it, there is a list of links and you just find the link that corresponds with your lecture and discussion section.
- Tue Jan 26, 2021 9:33 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm 1 Zoom Proctoring
- Replies: 14
- Views: 822
Re: Midterm 1 Zoom Proctoring
Yes! I believe will will be using our phones for zoom like in 14A
- Sun Jan 24, 2021 11:17 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Clarification for Sampling #7
- Replies: 10
- Views: 596
Re: Clarification for Sampling #7
ahh okay! That makes a lot of sense. Thank you guys so much!
- Sun Jan 24, 2021 10:57 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Clarification for Sampling #7
- Replies: 10
- Views: 596
Clarification for Sampling #7
HClO is a weak acid ( ka=4.0×10−8 ) and so the salt NaClO acts as a weak base. What is the pH of a solution that is 0.085 M in NaClO at 25 °C? In this problem, is it because they ask specifically about NaClO that you have to find kb first to solve the problem? I used ka and it was wrong so I just wa...
- Sun Jan 24, 2021 7:03 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Periodic Tables on Midterm
- Replies: 23
- Views: 1067
Re: Periodic Tables on Midterm
Yes, I think that we are allowed a periodic table and constants sheet and both are posted on the class website!
- Fri Jan 22, 2021 10:14 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm 1
- Replies: 4
- Views: 683
Re: Midterm 1
it is on friday, january 29 during the scheduled lecture time!
- Tue Jan 19, 2021 8:56 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Thermodynamics on Midterm 1
- Replies: 6
- Views: 334
Re: Thermodynamics on Midterm 1
We probably will have some thermodynamics, but he will probably send an email soon about which outlines and which parts will be on the midterm
- Sun Jan 17, 2021 9:37 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Sampling Week 1 #2
- Replies: 12
- Views: 800
Re: Sampling Week 1 #2
I would first start with making an ICE chart and solving for the initial molarity of 2SO3 by dividing the given moles by the given volume. Then you can start filling out your ice chart. The question gives you the final moles and by dividing that by the 3 L, you get the change in molarity/x. With th...
- Sun Jan 17, 2021 7:57 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Sampling Week 1 #2
- Replies: 12
- Views: 800
Sampling Week 1 #2
Hello! Can someone help explain how to do this problem? Thank you!
At a certain temperature, 0.980 mol SO3 is placed in a 3.00 L container.
2SO3(g)↽−−⇀2SO2(g)+O2(g)
At equilibrium, 0.130 mol O2 is present. Calculate Kc.
At a certain temperature, 0.980 mol SO3 is placed in a 3.00 L container.
2SO3(g)↽−−⇀2SO2(g)+O2(g)
At equilibrium, 0.130 mol O2 is present. Calculate Kc.
- Fri Jan 15, 2021 7:46 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Calculator for exams
- Replies: 28
- Views: 1117
Re: Calculator for exams
I think any calculator is fine!
- Fri Jan 15, 2021 7:43 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm 1
- Replies: 24
- Views: 1116
Re: Midterm 1
Last quarter, he sent an email before the midterm that told us which outlines were going to be on the test, so he will probably let us know soon. But I think parts of outline three might be included too since he said that we already finished outline 2
- Mon Jan 11, 2021 8:41 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Sapling Learning Tech Issues
- Replies: 5
- Views: 394
Re: Sapling Learning Tech Issues
If nothing works, you should definitely email your TA or Lavelle about it and see if they can figure out the issue
- Sun Jan 10, 2021 4:36 pm
- Forum: Administrative Questions and Class Announcements
- Topic: 14B Midterm Content
- Replies: 4
- Views: 358
Re: 14B Midterm Content
I don't think that topics in 14a will appear on the exam, but like the post before me said parts of the end of 14a might appear just because it overlaps with the content we are learning now. But Lavelle usually sends an email before tests on the topics that will be on the test, so if he does happen ...
- Sun Jan 10, 2021 4:33 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Sapling homework due date
- Replies: 14
- Views: 833
Re: Sapling homework due date
It is due Sunday midnight at the end of week 2 on the 17th!
- Wed Jan 06, 2021 11:51 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Sapling Homework
- Replies: 6
- Views: 335
Re: Sapling Homework
Yes, the only homework due are the problems assigned on sampling! But you get unlimited tries for each question and as long as you don't press the give up button, you will get full credit no matter the number of tries
- Wed Jan 06, 2021 11:45 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Sapling Assignments
- Replies: 30
- Views: 2172
Re: Sapling Assignments
I'm pretty sure that they are optional and just for practice if you need it!
- Mon Jan 04, 2021 11:01 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Dr. Lavelle's Disc Link
- Replies: 3
- Views: 132
Re: Dr. Lavelle's Disc Link
I couldn't find it on CCLE either, but the zoom link will probably be posted soon!
- Fri Dec 11, 2020 10:55 pm
- Forum: Naming
- Topic: Naming quizlet
- Replies: 41
- Views: 2046
Re: Naming quizlet
Thank you so much for this!!
- Fri Dec 11, 2020 10:53 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final
- Replies: 7
- Views: 471
Re: Final
Its gunna be with our TA, but I saw somewhere that we might be put into breakout rooms with different proctors in the room, since there'll be a lot more people.
- Fri Dec 11, 2020 10:49 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Are all questions on the final multiple choices?
- Replies: 29
- Views: 1871
Re: Are all questions on the final multiple choices?
Yes, like the last two midterms, the final will also be multiple choice!
- Tue Dec 08, 2020 2:21 am
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: 25 degrees celsius [ENDORSED]
- Replies: 6
- Views: 2066
Re: 25 degrees celsius [ENDORSED]
I think it is just a standard temperature, like room temperature. Since extreme temperatures can affect reactions and stuff, it just indicates that it isn't too hot or cold.
- Mon Dec 07, 2020 3:07 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Course Evaluations
- Replies: 10
- Views: 594
Course Evaluations
I was just wondering if we get any points from the course evaluations or if we have to do them for any credit. Thank you!
- Sun Dec 06, 2020 8:29 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: How to find coordination number.
- Replies: 10
- Views: 3689
Re: How to find coordination number.
Yes, thank you! Also, does anyone know how to calculate oxidation number?
- Sun Dec 06, 2020 8:26 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: How to find coordination number.
- Replies: 10
- Views: 3689
How to find coordination number.
Can someone explain how to find coordination number for coordination compounds? Thank you!
- Fri Dec 04, 2020 1:26 am
- Forum: Naming
- Topic: Ligand Names Table on Final
- Replies: 10
- Views: 533
Re: Ligand Names Table on Final
Yea, Lavelle did not mention that we could use that sheet in his email, so we are probably not allowed to.
- Fri Dec 04, 2020 1:25 am
- Forum: Administrative Questions and Class Announcements
- Topic: Textbook Issue
- Replies: 5
- Views: 349
Re: Textbook Issue
I was having trouble with that too! Thank you for the suggestion!
- Fri Dec 04, 2020 1:22 am
- Forum: Administrative Questions and Class Announcements
- Topic: Worksheets for final
- Replies: 5
- Views: 343
Re: Worksheets for final
Yea, I would only use the resources that Lavelle listed in his email, which, like stated above are a calculator, constants and equations sheet, periodic table, and scratch paper. The ligand sheet is probably not permitted.
- Sun Nov 29, 2020 9:31 pm
- Forum: Resonance Structures
- Topic: Dominant Contribution to Resonance Hybrid
- Replies: 4
- Views: 1040
Re: Dominant Contribution to Resonance Hybrid
Yes, I think when you are just changing where the double bond is in the structure, all the resonance structure contribute equally to the resonace hybrid
- Sun Nov 29, 2020 9:24 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Outlines for the Final
- Replies: 11
- Views: 738
Re: Outlines for the Final
Yea I think that all the 14A outlines will be covered for the final!
- Sun Nov 29, 2020 9:22 pm
- Forum: Administrative Questions and Class Announcements
- Topic: sapling
- Replies: 4
- Views: 322
Re: sapling
Yea! I think it is just for extra practice if you need it, not extra credit.
- Wed Nov 25, 2020 11:30 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chem 14B
- Replies: 5
- Views: 256
Re: Chem 14B
Yea, like what was said before, I think that the Lavelle wants to have the lectures recorded like this quarter, but it depends on if he can get permission to do it again and if he doesn't get sick. But he did suggest not to have any other classes overlapping with chem just in case.
- Mon Nov 23, 2020 11:49 am
- Forum: Administrative Questions and Class Announcements
- Topic: Thanksgiving Discussion
- Replies: 7
- Views: 289
Thanksgiving Discussion
I know we will probably have a lecture on Friday, but if we have discussion on Friday, will it be canceled due to Thanksgiving or will we still have to attend?
- Sat Nov 21, 2020 6:21 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 7 Sapling
- Replies: 12
- Views: 840
Re: Week 7 Sapling
Yea, we do have sampling for week 7, but on CCLE it says week 7 and week 8 sampling it isn't due until sunday midnight of week 8
- Sat Nov 21, 2020 6:18 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm 2 Grades
- Replies: 6
- Views: 491
Re: Midterm 2 Grades
Yea! I'm pretty sure we'll get our midterm grades by next week!
- Thu Nov 19, 2020 7:42 pm
- Forum: Ionic & Covalent Bonds
- Topic: Polar Covalent Bond
- Replies: 8
- Views: 362
Re: Polar Covalent Bond
How do you find the differences in the electronegativities? Is it based on where they are on the periodic table?
- Thu Nov 19, 2020 7:22 pm
- Forum: Ionic & Covalent Bonds
- Topic: Polar Covalent Bond
- Replies: 8
- Views: 362
Re: Polar Covalent Bond
Also for ion or nonpolar molecules. How can you tell from like the chemical formula which molecule is ionic or covalent and if there are partial charges or not.
- Thu Nov 19, 2020 7:17 pm
- Forum: Ionic & Covalent Bonds
- Topic: Polar Covalent Bond
- Replies: 8
- Views: 362
Polar Covalent Bond
How can you identify whether or not a covalent bond is polar or not? Are there certain elements that that always create polar covalent bonds? Thank you!
- Sun Nov 15, 2020 7:33 pm
- Forum: General Science Questions
- Topic: Midterm #2
- Replies: 11
- Views: 687
Re: Midterm #2
Yes, it covers the rest of Outline 2 and all of Outline 3!
- Sun Nov 15, 2020 7:30 pm
- Forum: Resonance Structures
- Topic: Sapling Weeks 5 and 6 # 3
- Replies: 2
- Views: 182
Re: Sapling Weeks 5 and 6 # 3
For that one, I has P in the middle and three oxygens single bonded to the phosphate. Each oxygen has three lone pair and a negative charge. The phosphate in the middle also has one lone pair.
- Sun Nov 15, 2020 5:58 pm
- Forum: Lewis Structures
- Topic: Number of Bonds for Elements
- Replies: 3
- Views: 126
Number of Bonds for Elements
Can someone explain how you know the number of bonds an element can have? I thought that nitrogen could only have three bonds but when doing sampling, they said it could have four. So I was wondering how you figure out the number of bonds an element can have? Thank you!
- Sat Nov 14, 2020 7:31 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saving 14B for second enrollement
- Replies: 4
- Views: 201
Saving 14B for second enrollement
Is it better to enroll in 14B during the first enrollment or will it be okay to save it until the second enrollment? I'm not sure how fast the class will fill up and I want to see which is the better option. Thank you!
- Wed Nov 11, 2020 3:33 pm
- Forum: Dipole Moments
- Topic: Induced Dipole vs Dipole
- Replies: 1
- Views: 90
Induced Dipole vs Dipole
I was wondering what the difference was between induced dipole and dipole and why induced dipole has a weaker bond.
Thank you!
Thank you!
- Sun Nov 08, 2020 4:40 pm
- Forum: Administrative Questions and Class Announcements
- Topic: missing discussion
- Replies: 8
- Views: 331
Re: missing discussion
Yes, I agree that going to a step up or workshop session will be very helpful if you miss discussion. But I don't think missing discussion will have a negative impact on your grade.
- Sun Nov 08, 2020 4:37 pm
- Forum: Bond Lengths & Energies
- Topic: Delocalized Electrons
- Replies: 5
- Views: 360
Delocalized Electrons
Can someone explain what delocalized electrons are? I don't really understand. Thank you!
- Sun Nov 08, 2020 4:26 pm
- Forum: Administrative Questions and Class Announcements
- Topic: MIDTERM 2 Textbook Sections
- Replies: 6
- Views: 307
Re: MIDTERM 2 Textbook Sections
He also has outlines of the different topics on the class website and what textbook problems to complete for those topics. I assume for now that the second part of outline 2 and probably outline 3 will be on the second midterm. Maybe more but not sure yet.
- Sun Nov 08, 2020 4:20 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Taking Bio and Chem simultaneously
- Replies: 26
- Views: 2640
Re: Taking Bio and Chem simultaneously
I'm doing LS7C and chem 14a right now and I think that the homework for bio is definitely more time consuming. We have readings due before every class which can take a while to read, but the class itself isn't too challenging if you do the readings and understand the clicker questions in lecture. Bu...
- Mon Nov 02, 2020 1:26 pm
- Forum: Lewis Structures
- Topic: Lecture #14: SO4^2- Lewis Structure
- Replies: 5
- Views: 173
Lecture #14: SO4^2- Lewis Structure
Hi! Can someone explain for the SO4^2- Lewis Structure why S is able to have 6 bonds? Thank you!
- Sun Nov 01, 2020 5:59 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: ml atomic number
- Replies: 2
- Views: 140
ml atomic number
Hi! Can someone explain what the ml atomic number represents and how many electrons are there?
Thank you!
Thank you!
- Sun Nov 01, 2020 5:55 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Different Types of Orbitals
- Replies: 2
- Views: 126
Different Types of Orbitals
Hi! I am a little confused about the different types of orbitals. Can someone summarize the differences between the s, p, d, and f orbitals?
Thank you!
Thank you!
- Thu Oct 29, 2020 1:29 am
- Forum: DeBroglie Equation
- Topic: Week 2,3,3 Sampling #25
- Replies: 2
- Views: 1730
Week 2,3,3 Sampling #25
For 25, when finding the energy of the photon and electron, the solution gives two different ways to solve it. For the photon, they use E=hv and c=vλ and for electron, they used λ=h/p and e=1/2mv^2. I was wondering why they used the two different methods and how you know which equations work with th...
- Wed Oct 28, 2020 5:15 pm
- Forum: Photoelectric Effect
- Topic: Sampling #4
- Replies: 3
- Views: 193
Re: Sampling #4
Thank you!
- Wed Oct 28, 2020 5:03 pm
- Forum: Photoelectric Effect
- Topic: Sampling #4
- Replies: 3
- Views: 193
Sampling #4
Hi can someone help me solve this? I got the work function, but I don't understand how to do the second part. Thank you! When a metal was exposed to photons at a frequency of 1.23×1015 s−1, electrons were emitted with a maximum kinetic energy of 3.70×10−19 J. Calculate the work function, Φ, of this ...
- Sun Oct 25, 2020 8:37 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Sampling HW Problems
- Replies: 4
- Views: 172
Sampling HW Problems
Are the sampling Hw problems in the correct order now or are they still shuffled randomly?
- Thu Oct 22, 2020 7:10 pm
- Forum: General Science Questions
- Topic: Using Equations for Problems
- Replies: 3
- Views: 162
Using Equations for Problems
I noticed that sometimes to solve a problem, you would need to combine one or two equations together to be able to get the answer. I was wondering if anyone had any advice to how to recognize when you need to do that. Also if anyone had any advice on how to know which equation should be used for whi...
- Wed Oct 21, 2020 3:53 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Webcam for Midterms [ENDORSED]
- Replies: 4
- Views: 377
Webcam for Midterms [ENDORSED]
For the miderms, are we supposed to have two cameras for our face and our desk, or is it just one for our desk?
- Mon Oct 19, 2020 4:59 pm
- Forum: DeBroglie Equation
- Topic: Measurable Wavelike Properties
- Replies: 4
- Views: 186
Re: Measurable Wavelike Properties
Yes, thank you I realized he answered it later in the lecture, i just didn't watch far enough lol
- Mon Oct 19, 2020 4:51 pm
- Forum: DeBroglie Equation
- Topic: Measurable Wavelike Properties
- Replies: 4
- Views: 186
Measurable Wavelike Properties
Hi! I had a question about the example in class about if the car has any measurable wavelike properties. How do you know if it does or not? Is there a certain mass that the object cannot exceed in order for it to be considered to have wavelike properties or is it just that it has to be an extremely ...
- Sun Oct 18, 2020 9:51 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Atomic Spectra
- Replies: 3
- Views: 142
Atomic Spectra
Can someone help explain this? Thank you! The meter was defined in 1963 as 1,650,763.73 wavelengths of radiation emitted by krypton-86 (it has since been redefined). What is the wavelength of this krypton-86 radiation? To what region of the electromagnetic spectrum does this wavelength correspond (i...
- Sun Oct 18, 2020 9:48 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Question about Midterms
- Replies: 9
- Views: 304
Re: Question about Midterms
Yea I think the one on the website should be okay
- Sun Oct 18, 2020 9:44 pm
- Forum: Administrative Questions and Class Announcements
- Topic: 14A website password
- Replies: 3
- Views: 120
14A website password
Does anyone remember the password for the 14A website? I looked everyone on CCLE and I don't remember where we got the password. Thank you!
- Sat Oct 17, 2020 5:55 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Question about Midterms
- Replies: 9
- Views: 304
Question about Midterms
I had a quick question about the midterms. Will we be allowed to have a printout of the periodic table for like molarity questions? Or will they be provided on the exam. Same with things like the speed of light, plank's constant, etc. Are we expected to memorize all of that? Or can we have a sheet w...
- Thu Oct 15, 2020 5:42 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric Effect
- Replies: 3
- Views: 249
Photoelectric Effect
Hi! Can someone explain this? Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x 105 m.s-1. The work function for sodium is 150.6 kJ.mol-1. Answer the following three questions. A. What is the kinetic energy of the ejected electron? B. How much energy is required to...
- Wed Oct 07, 2020 10:04 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Molarity Calculation
- Replies: 5
- Views: 374
Molarity Calculation
Hi! Can someone explain how to solve this? Thank you!
A solution is prepared by dissolving 55.1 g of KCl in approximately 75 mL of water and then adding water to a final volume of 125 mL. What is the molarity of KCl(aq) in this solution?
A solution is prepared by dissolving 55.1 g of KCl in approximately 75 mL of water and then adding water to a final volume of 125 mL. What is the molarity of KCl(aq) in this solution?
- Wed Oct 07, 2020 1:18 am
- Forum: Limiting Reactant Calculations
- Topic: Limiting Reactant Calculation
- Replies: 2
- Views: 212
Limiting Reactant Calculation
Hi! Can someone explain how to solve this? According to the following equation, 0.750 g of C6H9Cl3 is mixed with 1.000 kg of AgNO3 in a flask of water. A white solid, AgCl, completely precipitates out. What is the mass of AgCl produced? C6H9Cl3 + 3AgNO3 ---> AgCl + C6H9(NO3)3. Molar Mass: C6H9Cl3 (1...
- Wed Oct 07, 2020 1:13 am
- Forum: Limiting Reactant Calculations
- Topic: Limiting Reactant Calculation
- Replies: 5
- Views: 338
Re: Limiting Reactant Calculation
Ohh okay! That makes sense. Thank you guys so much!
- Wed Oct 07, 2020 1:11 am
- Forum: Administrative Questions and Class Announcements
- Topic: Advice from a Medical Student [ENDORSED]
- Replies: 297
- Views: 463074
Re: Advice from a Medical Student [ENDORSED]
Thank you so much for the advice! This was very helpful :)
- Mon Oct 05, 2020 5:50 pm
- Forum: Limiting Reactant Calculations
- Topic: Limiting Reactant Calculation
- Replies: 5
- Views: 338
Limiting Reactant Calculation
I don't really understand how to solve this? How do I compare the Co2 and CaCo3?
How many moles of CO2(g) are produced when 1 kg of CaCO3(s) is used to neutralize an acid spill? The equation for the reaction at 1 atm and 25 degrees C is:
CaCO3(s) + H2SO4(aq) ---> CaSO4(s) + CO2(g) + H2O(l)
How many moles of CO2(g) are produced when 1 kg of CaCO3(s) is used to neutralize an acid spill? The equation for the reaction at 1 atm and 25 degrees C is:
CaCO3(s) + H2SO4(aq) ---> CaSO4(s) + CO2(g) + H2O(l)