CHEMISTRY COMMUNITY

Keerthana Sivathasan 2E

As of right now, I don't think Lavelle made any announcement regarding an electronic or take home final, so I'm assuming it's still going to be held this Sunday, March 15 from 11:30 am to 2:30 pm.

Keerthana Sivathasan 2E

There are definitely some other solutions manual errors, and it would be a great idea if we submitted them to Lavelle, so he can add it to the solution manual errors link, so students in the next years can benefit from that.

Keerthana Sivathasan 2E

There is no official study guide for the final, but Lyndon's review session packets help a lot, and of course, going over Lavelle's outlines, reading the textbook and doing homework problems will help reinforce the concepts more.

Keerthana Sivathasan 2E

This quarter, there will be a review session held on Thursday from 6-9 pm for Chemical Equilibrium, Acids and Bases, Thermochemistry, and Thermodynamics held by UA's and Friday from 6-9 pm for Electrochemistry and Kinetics, which will be held by Lyndon.

Keerthana Sivathasan 2E

I think we will get tests back this week in discussion. I am pretty sure the TA's make the tests and Lavelle makes the midterm and final.

Keerthana Sivathasan 2E

If you are referring to Lyndon's review packet, then usually he tells a special code name that we can type into chemistry community and find the review packet under like "marshmallow" (it's different every quarter). You won't get an actual packet at the review session. Either you can print...

Keerthana Sivathasan 2E

There are no review sessions for Tests, only midterms or finals.

Keerthana Sivathasan 2E

Usually final review sessions are held Week 10, a week before the final, just like for the midterm, it was the week before the midterm leading up to it.

Keerthana Sivathasan 2E

4F-J will not be tested on Test 2. Only 5G.3, 5G.4, 5J.3 and electrochemistry will be on Test 2.

Keerthana Sivathasan 2E

I don't think there are any worksheets for test 2, but I'm sure there could be worksheets in review sessions. For test 2, the best thing to do would be just reading the textbook and doing the appropriate problems.

Keerthana Sivathasan 2E

Thank you so much for the lecture notes!

Keerthana Sivathasan 2E

Test 2 will cover the rest of thermodynamics that we didn't cover before the midterm (5G and J), and electrochemistry (6K-O). Test 2 will be more similar to Test 1, because of the time constraint and number of questions. In regards to whether it is harder than Test 1, I'm not really sure, but I thin...

Keerthana Sivathasan 2E

Sadly, Lavelle does not offer extra credit.

Keerthana Sivathasan 2E

I don't think there are official study guides, unless you decide to make some for yourself. Honestly, the best way to study is reading the textbook, doing the homework problems, and going to review sessions.

Keerthana Sivathasan 2E

Test 2 is the end of thermodynamics ( the chapter 5 part of thermodynamics that was not finished before the midterm) and electrochemistry.

Keerthana Sivathasan 2E

Considering we still haven't done test 2 yet, I think the best bet would be something from electrochemistry.

Keerthana Sivathasan 2E

Lavelle said we will only be tested on the rest of thermodynamics and electrochemistry. Even though we may learn some of chemical kinetics, we won't be tested on it.

Keerthana Sivathasan 2E

Usually we don't get answer keys for tests, but I think talking to your friends and comparing answers would be great so you can help each other.

Keerthana Sivathasan 2E

Lavelle usually never keeps lecture on midterm days, but this time there was also a review session if you wanted to go to it during normal lecture times.

Keerthana Sivathasan 2E

Usually, even if he does help curve at the end a little bit, it's only about 1-2%, so nothing drastic. I would suggest to just keep trying your best and hope for the best.

Keerthana Sivathasan 2E

I agree with Deena because I think he played the same song for Chem 14A when he was giving back our midterms.

Keerthana Sivathasan 2E

There are always review sessions held the week before either by TA's or UA's and the final lecture before the midterm, Lavelle does past exam questions. The midterm will cover Chemical Equilibrium, Acids and Bases, Thermochemistry, and Thermodynamics( finishing Chapter 4, not Chapter 5).

Keerthana Sivathasan 2E

Lavelle never has midterms during class, they will always be later in the day because they are two hours long.

Keerthana Sivathasan 2E

If you also check the chemistry class website, there is a link there to all the UA/TA hours held each week.

Keerthana Sivathasan 2E

Going to the 3 hour review session held by Lyndon and other UA's really help me to review all the concepts because they not only do the problem, but also review formulas, techniques, and strategies that may be helpful on the test. Reading the textbook and doing the problems may seem like a lot, but ...

Keerthana Sivathasan 2E

The outline will cover Chemical Equilibrium, Acids and Bases, Thermochemistry, and Thermodynamics( finishing Ch.4, he didn't go over Ch. 5 yet, so that won't be covered on the midterm).

Keerthana Sivathasan 2E

SVajragiri_1C wrote:Work is equal to the pressure times the volume.

Work is only equal to -(pressure* volume) if the external pressure is constant.

Keerthana Sivathasan 2E

I think it also depends on when your discussion is. For example, if your discussion is a little later in the week, then you could do homework that is a little more recent like the second and third laws of thermodynamics because you would have had a little more time to understand it, but if your disc...

Keerthana Sivathasan 2E

For the test, I have always found it useful to read the textbook and then do the accompanying problems. Reviewing class notes is also quite helpful, and using these strategies, I feel like you would be ready for the test.

Keerthana Sivathasan 2E

I would say at least try to go to one review session in each topic like 1 in Acids and Bases and 1 in Thermochemistry and so on. They are really helpful! Even if you feel like you have a topic down, it's great as a review, so you can make sure you're going to be okay for the actual midterm.

Keerthana Sivathasan 2E

No there's no study guides for the midterm or final, but Lavelle will go over past exam questions on Monday, February 10, which will be helpful to see the format of the tests. Also, the review sessions overall are very helpful, but Lyndon's three hour session has definitely got to be the best review...

Keerthana Sivathasan 2E

Reversible processes can make sense backwards and forwards, but for irreversible processes, there is a clear backward and forward. For example, throwing a chalk up in the air is reversible, but breaking an egg is irreversible.

Keerthana Sivathasan 2E

Work can be calculated using several formulas like Fd, PV, and Delta U-Q, depending on the situation, so you would have to be more specific in your question.

Keerthana Sivathasan 2E

Heat capacities will be given, especially for water, but the more problems you do, the more you will get used to the numbers and you can automatically memorize them.

Keerthana Sivathasan 2E

Q=mcdeltaT can be used for any solid, liquid or gas, but specifically for gases, if you have constant volume, you can use the equation, nC_vdeltaT, or constant pressure, nC_pdeltaT. C_v and C_p both are called molar heat capacities.

Keerthana Sivathasan 2E

Delta U is the change in internal energy of the system and will come more into play when going over thermodynamics, as it is part of the first law of thermodynamics.

Keerthana Sivathasan 2E

Midterms and tests will not be cumulative, but finals are

Keerthana Sivathasan 2E

In Week 3 discussion, our Test 1 will cover Chemical Equilibrium, and Acids and Bases.

Keerthana Sivathasan 2E

I would definitely say doing all the textbook problems and reading the textbook helps a lot. Sapling is great for review before tests and midterms, too. UA and TA sessions are great if and whenever you need help.

Keerthana Sivathasan 2E

No, Professor Lavelle does not give extra credit.

Keerthana Sivathasan 2E

Test 1 will be during your discussion on Week 3, and will cover Outline 1: Chemical Equilibrium and Outline 2: Acids and Bases.

Keerthana Sivathasan 2E

Lavelle said that doing problems from either Chemical Equilibrium or/ and Acids and Bases will be okay because we will be finishing Chemical Equilibrium today in lecture and starting Acids and Bases on Wednesday.

Keerthana Sivathasan 2E

Keeping in mind that the equilibrium constant is the ratio between concentration of products and concentration of reactants, if the concentration of products is increased, then the reaction's Q>K, and if the concentration of products is decreased then Q<K and Chatelier's principle will continue to t...

Keerthana Sivathasan 2E

This is supposed to show that even though pressure was changed, the equilibrium didn't shift, thus showing that equilibrium doesn't shift in response to changes in pressure, but changes in concentration. In this case, there were no changes in moles or volume, so concentration didn't change.

Keerthana Sivathasan 2E

ICE table is the table we learned in class with (I)nitial molar concentration, (C)hange in molar concentration, and (E)quilibrium Molar Concentration. We later used the quadratic formula, and simplified cubic equations to solve for K and X to find the molar concentrations.

Keerthana Sivathasan 2E

Q can only be equal to K when the reaction is at equilibrium. Q is just used to check to see if a reaction is at equilibrium if you are unsure. If Q is less than K, that means there is more reactants than products, so the reaction is still going to the right, while if Q is more than K, that means th...

Keerthana Sivathasan 2E

Sapling is to help out those who may need extra help. It is just extra practice problems, so it's not mandatory, but may be helpful.

Keerthana Sivathasan 2E

I don't think discussion section is mandatory and you won't get points from just being there. The points come from the homework you turn in. With all that said, it is very helpful to go to discussion because you can get extra practice on a lot of topics.

Keerthana Sivathasan 2E

It doesn't matter whether they are from different sections( like 5G or 5H) as long as it's under the topic we're learning that week, it can be any five problems, even all from the same section.

Keerthana Sivathasan 2E

I went to the top link that said "Register Alias and Password" and pressed it, which should direct you to the ucla sign in page and you can change your username there and put a new password if you would like.

Keerthana Sivathasan 2E

Homework is due on Friday in lecture for this week because Lavelle wants to make sure we all have enough time to complete it, but starting from next week they will be due in discussion.

Keerthana Sivathasan 2E

I think definitely going over homework problems, attending review sessions, and reading the textbook will help you do great on the final.

Keerthana Sivathasan 2E

The final will cover material from Weeks 1-10.

Keerthana Sivathasan 2E

If you go on the Chemistry Website, on the right side, there is a link called Final Exam: Review Sessions and Exam Venues. If you click on the link, the Final Exam Location, the review sessions being held and all UA and TA hours this week that are being held will pop up.

Keerthana Sivathasan 2E

Lavelle will go over past exam questions this Friday in lecture, but there are other resources like review sessions and UA sessions that may help to prepare for the final, too.

Keerthana Sivathasan 2E

I would definitely support the caffeine tip because even though caffeine may make your mind active for a little, eventually it makes you crash, so if you keep on drinking caffeine during the week up to your test, you may crash during the test. I would also say writing down what you need to do or mak...

Keerthana Sivathasan 2E

I don't think we can view the online discussion points as the weeks go by until the end, when they put it out of 50 points, but I do think you should talk to your TA about it if you want to know, because they might be keeping track.

Keerthana Sivathasan 2E

I think we will get them in discussion in Week 10, especially if you didn't have discussion in Week 9.

Keerthana Sivathasan 2E

I would definitely say that this class requires a lot of work, and especially coming from a not-so-strong chemistry background in high school, I think it makes me put more effort and take more advantage of all the resources that are out there to understand the topics and excel in the class.

Keerthana Sivathasan 2E

I think for the final, you should do all homework problems and review the textbook for areas you are unsure about. I think it will also be helpful to review some of the worksheets from UA sessions, your midterm, review sessions problems for the midterm, and the 2 tests we had.

Keerthana Sivathasan 2E

I definitely think Professor Lavelle will let us know in class later on this week so we will know for sure which of us go to which room.

Keerthana Sivathasan 2E

The final is cumulative weeks 1-10.

Keerthana Sivathasan 2E

I think it differs from person to person, because some people who have found 14A and B hard, find organic chemistry super interesting and easier and vice versa.

Keerthana Sivathasan 2E

I think that maybe looking through the whole test in the beginning, and seeing which ones are easy vs hard, can help you choose which problems to do first and which to wait on. Maybe, doing the easier ones first will help you feel like you have a lot of time for the harder, more time-consuming ones.

Keerthana Sivathasan 2E

Most people take Chem 14BL in a quarter after they have taken Chem 14B, so they are more familiar with the material. Chem 14BL is also work heavy, so you should keep that in mind when choosing classes.

Keerthana Sivathasan 2E

I don't think we will be given the electron shapes on test 2, I think we will have to know them, similar to today in lecture how when he showed us the molecules on the powerpoint slide, he expected us to classify them as tetrahedral or etc.

Keerthana Sivathasan 2E

Yes, the final exam is cumulative and will cover material from Weeks 1-10.

Keerthana Sivathasan 2E

If you go under the Test #2 Forum, someone had mentioned that their TA said Test 2 will cover the topics of "VSEPR, IMF, polarity and bonding".

Keerthana Sivathasan 2E

Most people take 14BL after fully finishing 14A and 14B, so they could already have a good grasp on the concepts covered in lab. 14BL does require a lot of work, so I wouldn't recommend taking it with 3 other classes, especially if your other classes are also work heavy and time consuming.

Keerthana Sivathasan 2E

I think homework from chapter 3F would be perfect, especially because we didn't start Molecular Shape and Structure until yesterday in lecture and some people would have already had discussion this week.

Keerthana Sivathasan 2E

Viscosity is the measure of resistance of a fluid to flow. A fluid that is highly viscous has a high resistance (like having more friction) and flows slower than a low-viscosity fluid. The easier a fluid moves, the lower the viscosity. Viscosity is expressed in units of the poise (mPa•s). Because a ...

Keerthana Sivathasan 2E

VSEPR will be covered in 2E, but we were only tested on the midterm until 2D, so we won't be expected to know it yet, as he also hasn't mentioned it in class.

Keerthana Sivathasan 2E

Kilo is always 10^3. Other prefixes include Mega (10^6), Deci (10^-1), Centi (10^-2), Milli (10^-3), Micro (10^-6), Nano (10^-9), Pico (10^-12).

Keerthana Sivathasan 2E

I'm pretty sure we will be asked to specifically draw resonance structures if he wishes we include them.

Keerthana Sivathasan 2E

BaBr2 is primarily ionic because the electronegativity difference between the Ba and Br molecules are high and using the scale ,<1.5 covalent , 1.5-2 polar covalent, 2< ionic, you can see from the Pauling Electronegativity table that BaBr2 is ionic with the differences in these 2 molecules electrone...

Keerthana Sivathasan 2E

We will not be given an electronegativity chart, but we won't need to know them very accurately or precisely. You just need to know whether it increases or decreases down a period and down a group, similar to how you should know the trends of ionization energy, electron affinity, and atomic radius.

Keerthana Sivathasan 2E

The topics are separated into sections-Fundamentals, Early Quantum, Late Quantum, Bonding/Structures. All the people in charge of, for example, Early Quantum, will cover the same topics like Electromagnetic Radiation, Photoelectric Effect, Atomic Spectra, and etc., but each will have a different app...

Keerthana Sivathasan 2E

Formal charge also helps you determine whether you should leave a lone pair alone or make a double bond. Normally you would prefer a formal charge of 0, to make it the most stable.

Keerthana Sivathasan 2E

In terms of preparation for the midterm, I definitely think it will be helpful to do all the problems, because one of them will appear on our midterm, but in general, for our homework, you only need to do 5 to get full points.

Keerthana Sivathasan 2E

The midterm will cover Fundamentals (Review of Chemical & Physical Principles), The Quantum World, and Chemical Bonds (excluding 3F.4 and 3F.5). We will be tested on material up to this Friday, November 1, 2019. Regarding electronegativity, I think we just need to know the general trends, not sp...

Keerthana Sivathasan 2E

On the Chemistry website, if you look on the right side under the header "Exam Information", there is a link labelled "Midterm Review Sessions and Rooms". Here you can find information about when and where the Midterm will take place, midterm review sessions, UA hours, and TA hou...

Keerthana Sivathasan 2E

Instead use E(kinetic)=hf-(work function) to see when kinetic energy is equal to 0.

Keerthana Sivathasan 2E

The Balmer and Lyman series relate to hydrogen. The emission spectrum of atomic hydrogen consists of particular wavelengths, which was discovered by Johann Jakob Balmer, a Swiss schoolteacher in 1853. He found that the visible wavelengths fit a mathematical formula. These wavelengths known as the Ba...

Keerthana Sivathasan 2E

E=hv is not equal to the work function, but E(kinetic)=hv-(work function) is the equation you should use for the photoelectric effect. Hv is the energy of the photon coming in and shining on the metal, work function is the energy it takes for an electron to be emitted off a specific metal, and kinet...

Keerthana Sivathasan 2E

I believe Quantum World is fine for Week 4 homework, as we haven't gone in to much depth for Chemical Bonds, and I'm sure even if you did one or the other, the TA will not mark points off because they are recently covered chapters.

Keerthana Sivathasan 2E

Sapling isn't mandatory, but Professor Lavelle has put "multiple additional assignments and learning objectives for those who need additional assistance" which will definitely help you in any way possible, especially if you are struggling with a specific topic and may not be able to make i...

Keerthana Sivathasan 2E

I'm pretty sure they will provide us with the periodic table and needed formulas and equations. If we were allowed to bring our own periodic table, they would need to check everyone's to make sure no one is writing hints or clues on the back, which Is quite a hassle.

Keerthana Sivathasan 2E

Test 1 was worth 50 points and we don't bring anything. The TA provided us with the formula sheet and problems with much room, especially with the empty back sides to show work. We have the whole discussion section (50 minute period) to complete it. I think we will get it back by the next discussion...

Keerthana Sivathasan 2E

Threshold energy is the work function. We need to know this because it's different for each metal surface, and you have to know what the minimum energy required to make an electron fire off the surface would be. Another thing to note is that the number of electrons emitted of the metal surface depen...

Keerthana Sivathasan 2E

In class today, he gave examples and explained more about the Heisenberg's Indeterminacy Equation. He also said we don't need to know how to derive it, because it's past the scope of our class.

Keerthana Sivathasan 2E

Speed of radiation does not decrease when frequency decreases because it is a constant. Using the formula c=v*wavelength where v is frequency and c is speed, if v increases, then wavelength will decrease in order to maintain the same c. The variable c can't change because it is a constant.

Keerthana Sivathasan 2E

DeBroglie is used for all moving particles and is a link between matter having wave properties and vice versa. The higher the energy, the lower the DeBroglie wavelength. All the moving particles must have a "matter wave", which is a probability function, associated with them.

Keerthana Sivathasan 2E

Week 2 homework could be quantum and fundamentals solely because we also had Test 1 that week, and Lavelle said doing fundamentals problems for our homework would help us for the test, but because we learned some quantum in class, it was okay to do those problems as well.

Keerthana Sivathasan 2E

https://www.sciencedaily.com/releases/2 ... 095927.htm
I thought this article was interesting especially considering the big focus on climate change and ocean pollution now.

Keerthana Sivathasan 2E

Hearing your story makes me so happy! Congratulations on everything you have achieved so far and everything you are going to in the future. Pediatrics is my desired specialty, so I'm so happy you find it so enjoyable. I think it's interesting to go through rotations in several different specialties ...

Keerthana Sivathasan 2E

I have a similar experience taking chemistry sophomore year of high school, and now doing 14A is difficult. I definitely do feel that Lavelle does give us the most resources that he can with all the outside hours by UA and TA and obviously his office hours, which we have to utilize for most success....

Keerthana Sivathasan 2E

In terms of rounding for the homework, I remember Professor Lavelle mentioning to not round any answers until the end to obtain the most accurate answer, and for the final answer as long as we keep the same number of sig figs, I think we will be good. I don't think we will be penalized for not writi...

Keerthana Sivathasan 2E

For better reference, here are some more rules: 1. Non zero digits are always significant. 2. Zeros between 2 significant digits are significant. 3. Trailing zeros and final zero are only significant in the decimal part. 4. For numbers less than 1 like in 0.05, the 0 before the decimal point is sign...

Keerthana Sivathasan 2E

Dear Professor, I truly appreciate the way that you are always so positive and smile a lot during class, which makes chem go by so fast, especially because sometimes these concepts may be difficult to understand and grasp. I also find it so nice that you give out so many opportunities to get help, l...

Keerthana Sivathasan 2E

I personally feel the same way, but I have found several ways to help lessen my anxiety before finals. I always make sure to take breaks in between topics so my mind won't feel so crammed with information, and I like to start studying a little bit in advance to spread out the work. I also make sure ...

Search found 101 matches