CHEMISTRY COMMUNITY

NayeliPlayas_1L

I'm having trouble understanding how we determine whether it is first order, second order, or zero order. If someone could please explain, it would be really helpful. Thank you!

NayeliPlayas_1L

My favorite topic was Thermodynamics even though it was quite challenging for me. I actually enjoyed chemistry more than I thought I would and I was even thinking about a minor in chem but sadly there is no such thing :(

NayeliPlayas_1L

I will catch up on sleep as well as the show I abandoned for the past couple of weeks. I also plan on going to the beach if the weather is nice.

NayeliPlayas_1L

In a workshop they mentioned that you include everything except for H20 and electrons.

NayeliPlayas_1L

Wait, are all these jokes too basic for you? Because I see no reaction.

NayeliPlayas_1L

Hi, is there case in which you do NOT include a salt bridge? or is the salt bridge always included?

NayeliPlayas_1L

I love cheesecake and for the past few days I've been craving Dave's Hot Chicken with some agua de horchata.

NayeliPlayas_1L

John Pham 3L wrote:I think that most of these Standard Reduction Potentials are given in Appendix 2B.
The problems don't refer to this Appendix but that's where I found most of the potentials

Okay thank you! I thought so, I just didn't know where to find them. Thank you so much.

NayeliPlayas_1L

Write the half reactions and the balanced equation for the cell reaction for each of the following galvanic cells.

(a) Ni(s)|Ni2+(aq)||Ag+(aq)|Ag(s)

On the solutions manual it mentions that the E°(cathode)=+0.80V and E°(anode)= -.023. I was wondering how these values were found?

NayeliPlayas_1L

The E value remains the same unless you are flipping the reaction, then you need to change the sign of the value.

NayeliPlayas_1L

I learn best when I watch videos instead of reading the information and I personally found this video to be really helpful. I would totally recommend it if you are having trouble understanding oxidation numbers.
https://youtu.be/-a2ckxhfDjQ

NayeliPlayas_1L

Making bad chemistry jokes because all the good ones Argon

NayeliPlayas_1L

Based off of chem 14A, all of our exams should be proctored including the final.

NayeliPlayas_1L

Najia Saleem 2G wrote:Yes! Dr. Lavelle sent an email mentioning section 5J.3 and Examples 5J.4 and 5J.5.

Thank you so much!

NayeliPlayas_1L

Thank you! Are there any practice problems in the textbook using the van't Hoff equation?

NayeliPlayas_1L

For Midterm 2, will we be tested on the van't Hoff equation? If so, can someone please explain the basic gist of the equation?

NayeliPlayas_1L

Hi, I believe that for degeneracy it is states/positions^molecules. For example in 4G.1 it said "Calculate the entropy of a solid nanostructure made of 64 molecules in which the molecules (a) are all aligned in the same direction (b) lie in any of the four orientations with the same energy.&quo...

NayeliPlayas_1L

ohhh okay that makes so much more sense. Thank you!

NayeliPlayas_1L

Calculate the reaction Gibbs free energy of N2(g)+3H2(g) ->2NH3 (g) when the partial pressures of N2, H2, and NH3 are 4.2 bar, 1.8 bar, and 21 bar, respectively, and the temperature is 400.k. (b) Indicate whether this reaction mixture is likely to form reactants, products, or is at equilibrium. I un...

NayeliPlayas_1L

I really appreciate that you took the time to post this and address this topic. Often times I put myself down when I don't achieve a certain grade on my exams. This really helps ease the stress for midterm 2.

NayeliPlayas_1L

Hi, I've gone to a few review sessions and they review different problems. I would recommend attending as many as you can to prepare for the upcoming midterm.

NayeliPlayas_1L

I plan on taking chem 14C next quarter along with anatomy and another course, but I am unsure of what my 3rd class should be. Do you guys have any recommendations? I heard Scand 50 was a good class but I also heard that it fills up fast. I was thinking of taking Scand 50 too! But I am also consider...

NayeliPlayas_1L

I plan on taking chem 14C next quarter along with anatomy and another course, but I am unsure of what my 3rd class should be. Do you guys have any recommendations? I heard Scand 50 was a good class but I also heard that it fills up fast.

NayeliPlayas_1L

Hi! Usually when Im'm watching the lecture videos I take notes on his presentation, but I also make little side comments that help me understand the material better. A few days before the exam I review the notes and they help me retain the information a lot better because the side comments that I ma...

NayeliPlayas_1L

Hi, I would recommend getting enough sleep the night before the midterm. I think often times we forget how important sleep is. Personally there have been times when I think that I could be studying instead of sleeping, but I had to remind myself that sleep is extremely important. I would recommend g...

NayeliPlayas_1L

I would recommend "The Girl with The Dragon Tattoo" by Stieg Larsson. I really love the book and there is also a movie. I have not watched the movie yet, but the books are always better.

NayeliPlayas_1L

Hi, I was going through the textbook and I cam across transitional, rotational, and vibrational energy in section 4B.3 and I was wondering if we have to know about them. That I know of, Dr. Lavelle has not mentioned them.

NayeliPlayas_1L

Thank you for the explanation!

NayeliPlayas_1L

Okay thank you! I just want to make sure I focus on the correct topics for midterm 2.

NayeliPlayas_1L

Hi! Does anyone know what outlines we will be tested on for Midterm 2? I'm not sure if Dr.Lavelle has specified this already. But if anyone does know it would be really helpful :) Thank you

NayeliPlayas_1L

Hi! I had the same issue you had with time. The questions can take quite long to solve and I personally feel that we were not given enough time to solve them all. I had to guess on the last few questions because there was not enough time to solve them all. However, now I know what to expect for the ...

NayeliPlayas_1L

Hi, I was wondering if anyone knows if there is any way that we can review our midterm once the midterm scores are out? I would like to know what questions I got correct and incorrect to help me prepare for the cumulative final.

NayeliPlayas_1L

A 0.305 mol sample of N2(g), initially at 298 K and 1.00 atm, is held at constant pressure while enough heat is applied to raise the temperature of the gas by 17.5 K. Calculate the amount of heat q required to bring about this temperature change, and find the corresponding total change in the intern...

NayeliPlayas_1L

It usually takes about a week to receive midterm grades. Once our midterm is graded, Dr.Lavelle will send out an email letting us know that the midterm grades are up. It takes a while because they give partial credit for some of the questions. On this midterm the 10 point question can receive partia...

NayeliPlayas_1L

I know that group 1 and group 2 are considered strong bases. It's pretty easy to remember and most likely you wont forget. However, I do think pneumonic are pretty useful as well.

NayeliPlayas_1L

I think for right now we should focus on the problems that he mentioned in the email to make sure that we really understand the problems. However, if you already have a great understanding of the material I don't see why you can's move on to other problems of the same section. Good luck on the midte...

NayeliPlayas_1L

I was wondering if we will still have our discussion section on the day of the midterm. My discussion section is on Friday 8am. Also, would we have to join our TA's zoom at the time of the midterm or do we have to join a specific zoom link?

NayeliPlayas_1L

If the reaction shifts right then more products will be formed and if the reaction shifts left then more reactants will be formed.

NayeliPlayas_1L

The exams are timed and we have 50 minutes to complete them. From what I remember the midterms usually consists of 10-15 multiple choice questions. We are able to use a periodic table, constants and equations sheet, and scratch paper. All the exams are proctored by your TA and we also have to use a ...

NayeliPlayas_1L

Will tomorrows lecture be the cutoff for midterm 1? Or will we be tested on material from next weeks lecture for midterm 1?

NayeliPlayas_1L

I was wondering the same thing as I was watching the lecture. I would love to hear what others have to say about this. I was also thinking the same thing that the steam has already come into contact with the cold air, but I am not 100% sure.

NayeliPlayas_1L

Thank you all for the information. I will make sure to study outlines 1 & 2 for the midterm!

NayeliPlayas_1L

What outlines will we be tested on for midterm 1? I know so far we have covered chemical equilibrium and acid and base equilibria. I was wondering if thermochemistry and thermodynamics will be covered in midterm 1.

NayeliPlayas_1L

What do you do with a sick chemist?
If you can't helium, and you can't curium, then you might as well barium

NayeliPlayas_1L

Will we be having discussion sections for week 3? I have my discussion section on Friday, but since we don't have class on Monday, I was wondering if it will somehow affect all discussion sections for week 3.

NayeliPlayas_1L

I was solving for the equilibrium concentration using the quadratic equation and when I solved for x I got 2 positive values. I know that x cannot be a negative value, but in this case I got 2 positive values. I was confused on what value to use for x. If anyone could please clarify this confusion, ...

NayeliPlayas_1L

Hello, I was wondering if anyone has any study tips that are efficient for this class. I am not a fan of chemistry and I struggle a bit, so I was wondering if anyone has any helpful tips that they would like to share.

NayeliPlayas_1L

Every UA has different worksheets. I would recommend going to as many as you can if you are ever confused on a topic. Personally I find them very helpful.

NayeliPlayas_1L

In todays lecture we went over an example of a cubic equation but Dr.Lavelle mentioned that we wont have to solve cubic equations for this class. So we don't have to worry about them right?

NayeliPlayas_1L

I was watching todays lecture and I was confused on an example that was given. It was the first example that was given at the very start of the lecture. "1.50 mol PCl5 is placed in a 500 ml reaction vessel and decomposes at 250 degrees celsius to from PCl3 and Cl2 Kc=1.80, all 3 compounds are g...

NayeliPlayas_1L

I'm not really sure how to approach this question either so I would also like to hear if anyone has an idea (how can we tell which flask is at equilibrium without having the reaction equation /knowing the concentrations at equilibrium?). However, I did want to say that I think you are looking at pr...

NayeliPlayas_1L

I was a bit worried but thank you all for clarifying! :)

NayeliPlayas_1L

At the beginning of the week I changed my username so it could align with my discussion section, but I noticed today that It was the wrong discussion section. I have fixed my username so it could align with my discussion section. However, I was wondering if it will somehow affect the posts I made un...

NayeliPlayas_1L

I've been wondering how we could post images on chemistry community. There are times when I want to post an image of my work to help others but I can't seem to figure out how. If anyone could please help me that would be extremely helpful. Thank you :)

NayeliPlayas_1L

The following flasks show the dissociation of a diatomic molecule, X2, over time. (a) which flask represents the point in time at which the reaction has reached equilibrium? (b) what percentage of the X2 molecules has decomposed at equilibrium? (c) Assuming that the initial pressure of X2 was 0.10 b...

NayeliPlayas_1L

Hello I was wondering if there is a groupme for this class. I find it really helpful when students help each other and if there is not a groupme for this class yet, I'd be more than happy to make one!

NayeliPlayas_1L

Has Dr.Lavelle mentioned anything regarding final exam scores?

NayeliPlayas_1L

I felt the same way! I had to guess on the last couple of questions and I did not have time to review my answers either. I feel like it was not enough time for 30 questions. Some of the questions were quite lengthy as well.

NayeliPlayas_1L

In an email he clarified that the final would be the same format as the past 2 midterms; all the questions are going to be multiple choice. Good luck on the final!

NayeliPlayas_1L

I am not sure, but I would still recommend to complete as many of the textbook problems that you can. They are great practice and you might stumble upon a few on the final. Good luck!!!

NayeliPlayas_1L

I was a bit confused by this too. Initially I thought that all the final exam questions would come from the textbook. I would probably email Dr. Lavelle for more clarification.

NayeliPlayas_1L

Hi, my TA recommended that we memorize the most common ones for the final exam.

NayeliPlayas_1L

I downloaded the textbook through the Bookshelf application and I am able to see the problems completely. If you have access to Bookshelf I would recommend installing the book.

NayeliPlayas_1L

Hi! I heard that the final will be around 30 questions. I believe it was in an email that Dr.Lavelle sent out.

NayeliPlayas_1L

I've gone to a few UA sessions and past midterm exams have been shared to help us prepare for the exams. I was wondering if anyone knows if there is a past final exam that we could use to study for the final?

NayeliPlayas_1L

Okay thank you! I just want to be sure so I know what topic to focus on the most.

NayeliPlayas_1L

In Dr. Lavelle's email he said that the final would be 30 questions. I was wondering if anyone knows if the final will have a focus on the current section that we are learning or if the questions will be evenly distributed between the topics that we have learned this quarter.

NayeliPlayas_1L

If there is a pi bond, then a sigma bond must be present. I believe there is always a pi bond and sigma bond when there is a double bond or more than a double bond present. Correct me if I'm wrong.

NayeliPlayas_1L

Oh wow, I was not aware of that. I was confused as to how we were supposed to solve the problems. I will be downloading the bookshelf app! Thank you!

NayeliPlayas_1L

I was going through some of the practice problems on the textbook and I noticed that some of the questions are not complete. For example, 2E.15 just says "Draw the Lewis structure and the VSEPR formula, list the shape, and predict the approximate bond angles of (a) (b) (c) (C is the central ato...

NayeliPlayas_1L

I was curious as to how the final is going to workout since the final is on a Sunday from 11:30-1pm. Can we take it any time within the time frame or is the final 1 hour and 30 mins long? Also would we have to join our TA's zoom on the day of the final?

NayeliPlayas_1L

The Final is cumulative. I was also wondering how the final is going to workout. Does anyone know if we will have to join our TA's zoom when taking the final since the final is on a Sunday...

NayeliPlayas_1L

On the syllabus it says we need 50% or higher to pass the class with a C- or higher. Would a 90% account for an A-, 78% for a C+, and so on?

NayeliPlayas_1L

Does anyone have any tips on how to study for the final? I'm having a bit of trouble trying to learn the new material and review the old material and I was wondering if anyone has any helpful tips. Thank you :)

NayeliPlayas_1L

I was just wondering if anyone knows when Midterm 2 grades for chem 14A will be posted?

NayeliPlayas_1L

Why are Chemists so great at solving problems?

Because they have all the solutions!

NayeliPlayas_1L

I think the only reason we had a lecture on Veteran's Day was to give everyone at least a week before the midterm because if the lecture was skipped then Outline 3 would end on Friday giving Tuesday testers only 3 days to prep where they would have 5 days in advance to study. However, we do not hav...

NayeliPlayas_1L

During veteran's day we still had a lecture for that day and I was just wondering if we will be having a lecture on Friday of week 8. I believe Thanksgiving Holiday is from Nov. 26-27, which is why I am curious if we will have a lecture video for that day.

NayeliPlayas_1L

After watching todays Lecture, these are the shapes that are associated with the formulas. I just wanted to confirm that they are correct. AX4E2: Square Planar Shape AX2E2: Bent or Angular Shape AX4: Tetrahedral Shape AX3E: Trigonal Pyramid Shape AX4E: Seesaw Shape Also, would we have to memorize th...

NayeliPlayas_1L

I was checking for the homework yesterday, but I did not see anything under week 7. I checked again today, but there is still no homework uploaded under week 7, I was wondering if anyone knows when the homework will be available?

NayeliPlayas_1L

In a recent email, Dr.Lavelle mentioned that we need to update Respondus before Midterm 2. Does anyone know how to update respondus?

NayeliPlayas_1L

Thank you so much to everyone that replied! :)

NayeliPlayas_1L

Thank you for the response! This information was very useful!

NayeliPlayas_1L

Was Wednesday's lecture the last lecture that will be covered on midterm 2? Will Friday's Lecture (Nov13) be on midterm2 or is that new material for the final?

NayeliPlayas_1L

Next quarter I'm planning on taking chem 14B, but it overlaps with another class and I was wondering if chem 14b with Dr.Lavelle is asynchronous just like chem 14A

NayeliPlayas_1L

How do we know what elements are an exception to the Octet rule? Is there a way to tell using the periodic table or do we have to memorize the exceptions?

NayeliPlayas_1L

Okay, thank you!

NayeliPlayas_1L

In the textbook, it asks us to write the formula unit for lithium nitride using lewis symbols, but it does not give us the formula (Li3N) for the midterm would we be given the formula for a similar problem or would we have to find it using the periodic table?

NayeliPlayas_1L

Okay thank you! I was just wondering because all my other classes canceled their lectures since it's supposed to be a day off. I was a bit confused, but thank you for the clarification.

NayeliPlayas_1L

I received an email this morning and Dr. Lavelle mentioned that he will have class this Wednesday. So that means that we will have to watch a lecture video on veterans day for chemistry 14A?

NayeliPlayas_1L

Thank you for the information!

NayeliPlayas_1L

During the past 2 lectures, Dr. Lavelle has been talking about acids and bases, but he mentioned that we wont cover those topics until weeks 9 &10. However, since he's mentioned them in his past 2 lectures, does that mean that we will be tested on them for midterm 2?

NayeliPlayas_1L

Thank you all for the information regarding the constants and equations page!

NayeliPlayas_1L

In order to receive credit do we have to post 5 times a week or can we just have a total of 50 posts by the end of the quarter? There are times when I post more than 5 times a week and I was wondering if they would roll over to next week or if we have to post daily in order to receive credit. If any...

NayeliPlayas_1L

I noticed that on the constants and equations page the formula for formal charge was not on there. Does that mean that we would have to memorize it for midterm 2?

NayeliPlayas_1L

What did the other elements say to Hydrogen?

What a loner!

NayeliPlayas_1L

Thank you for the information!

NayeliPlayas_1L

Hi for midterm 1 I know that for the quantum world we were not tested on the last 8 bullet points of the outline. Does that mean that we will be tested on those last 8 bullet points for midterm 2?

NayeliPlayas_1L

Hi does anyone know if Dr.Lavelle mentioned when the test scores for midterm 1 will be released? When they are released, where could we check our scores?

NayeliPlayas_1L

I was also confused about this. I was not sure how to tell whether I had to use the De Broglie equation. Thank you for explaining Kailani!

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