CHEMISTRY COMMUNITY

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The best thing for me is actually writing down all my notes, it's the only thing that actually seems to stick. I've tried typing when we were back on campus but ever since we switched to online, I try to stay away from the computer as much as possible.

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Its J/mole and kJ/mole. Always make sure to look for what the question is asking for and just remember that k is 10^3.

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Calculate the activation energy, Ea , in kilojoules per mole for a reaction at 73.0 ∘C that has a rate constant of 0.244 s−1 and a frequency factor of 5.80×1011 s−1 .

Can someone help me on this problem, I keep on getting the wrong answer but I don't know what I'm doing wrong. Thank you

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yeah, the anode is always placed on the left side, and the cathode is placed on the right side.

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Like everyone else has suggested, the best thing to do is go over the outline to get an in-depth knowledge of the concepts taught by Lavelle in lecture.

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I was planning on taking 14C next quarter but the classes got filled up before I was able to enroll. Does anyone know if they're going to open more spots because I remember seeing 14A & 14B being filled but spots always open up for more students. Does the same apply to 14C or does it depend on t...

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I miss walking down bruin walk and being asked "Let me ask you a question?", if you know you know.

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https://www.chem.purdue.edu/gchelp/howtosolveit/Kinetics/IntegratedRateLaws.html
This was a good visualization to help me under understand rate laws, hope it helps!

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Wandavision is AMAZING SO FAR!!!! I've seen way too many spoilers for it though, so I try and avoid social media on Fridays (episode release dates). I literally got Disney+ just for Wandavision. That ending tho! It was a great show but now I'm looking forward to watching The Falcon and the Winter S...

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FOSHOOO!!! I wonder if Dr.Lavelle will be blessing us with some vocals?

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I don't think CCLE tells you your overall grade but you can just calculate that yourself. Using what the instructor has inputted for grades, you can just use their syllabus to calculate what your grade is looking like for the moment or estimate what you need to score for the next couple of assignmen...

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My favorite snack are frozen grapes, especially during the summer!

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The points are capped at 50 but chemistry community is still a great resource to use! It's meant to serve as a community where we can help each other out or simply make new friends, I think we're actually encouraged to post more than 5 times a week.

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I used to use safari as well but I started having problems like sapling wouldn't open or the textbook wouldn't load but after switching to chrome everything has been working fine. I recommend using chrome for sapling!

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H+ ions and water are added to half-reactions to balance the overall reaction.

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Khan Academy will definitely help but I agree with @Melody Wu 2L! It's important to let your mind and body relax so make sure to get some "Me Time". We don't get very many breaks with the quarter system so take advantage of this one!

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I felt a great weight lift off my shoulders after this midterm so to destress I played COD with friends.

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I was planning to take 14c but it looks like classes are filling up fast so hopefully they open more spots up.

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It usually takes around a week to review the test but Lavelle always sends an email out to inform us that they are graded so keep an eye out for that.

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I feel the same way! I think we should focus on trying to master the concepts before attempting to do any of the problems.

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SEE. It's on Apple TV plus and it so interesting!

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Email your TA and you can go over your midterm one on one with your TA. I think some even go over it during their office hours the week scores are released.

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I didn't do too well either so I'm definitely going to be attending UA sessions. I find sapling questions to be helpful because it has step by step solutions which you can use to solve the tougher textbook problems.

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The only option next quarter would be Dr.Casey but the good thing about Dr.Casey is she encourages group work so for the most part you'll be working with a group for assignments. Take a look at bruin walk to see what other students feel about the class.

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I definitely understand how you feel, lately I have not had much motivation for school. What I usually do to get over the mood is try to get some form of studying done, even if it's only for twenty minutes. From there, I usually take a break to do something to bring my spirits up and see if I'm up ...

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(Mass of hot water)(4.18 J/g*c)(t-25)C=(mass of cold water)(4.18 J/g*c)(95-t)C

You just need to plug in your mass and solve for t!

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Just as someone previously stated, Lavelle actually submits the scores for chemistry community manually which is why they're not updated as soon as you post. For the most part, I think the TA just makes sure we have a total of 50 points by the end of the quarter. Chemistry community isn't meant to b...

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Thank you! This helped plenty!

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A 0.721 mol sample of N2(g) initially at 298 K and 1.00 atm is held at constant volume while enough heat is applied to raise the temperature of the gas by 14.5 K. Assuming ideal gas behavior, calculate the amount of heat (q) in joules required to affect this temperature change and the total change i...

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If you look at the solution it explains that an endothermic reaction has stronger reactant bonds and weaker product bonds. While exothermic reactions have weaker reactant bonds and stronger product bonds. We can use to table provided that explains bond strength to help us identify which is which.

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Who do you think is going to win the Superbowl?! Will it be the Kansas City Chiefs or Tampa Bay Buccaneers?

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If anyone is into alternative music, I'd recommend listening to Rainbow Kitten Surprise! I know their name may sound like it came out of a kids show but give them a shot!

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Can someone help me go about this question please. Thank you!

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K is the equilibrium constant but to be more specific in problems they will use Kc for concentration and Kp for pressure.

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State function doesn't consider the path taken, instead it focuses on the final and initial.

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I'm taking 14BL right now and its pretty manageable, it doesn't really overlap with the context in 14B. For the most part it's lab orientated so you learn concepts and ideas that would be helpful in an actual lab but there are some calculations similar to 14B.

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I checked the outline and I didn't see anything about buffers, considering that this midterm will only go over materials from week 1-3 I don't think we should be too worried about it.

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The UA sessions are great but if you want to prepare yourself for the exam, I'd recommend practicing the textbook problems! There are plenty of questions to go over so solving most of them is a good way to study.

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I think you might be using ln which has a base of e. If you press the math function on your calulator and scroll down to logBASE(), you can input your own base just to make sure the base is 10. This might make it more clear when you're solving your problems.

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Muscles produce lactic acid, CH3CH(OH)COOH(aq) , during exercise. Calculate the percent ionization (deprotonation), pH, and pOH of a 0.1058 M solution of lactic acid. The acid‑dissociation (or ionization) constant, Ka , of this acid is 8.40×10−4 . percent ionization= pH= pOH= I'm having a little tro...

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Sapling is good to learn the steps of a problem because it breaks down each question for you but the midterm questions are similar to the textbook problems. So the best advice I can give is practice the textbook practices, I believe some questions even come directly from the hw.

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Endothermic reactions absorb energy from their surroundings while exothermic reactions release energy. This image shows the change in potential energy from each reaction.

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Why does the PH of neutral water decrease when temperature increases and vice versa?

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Midterms will NOT be taken place during our discussion time, instead it will be during our Friday lecture time. My TA said that the exact logistics are still being worked out but to expect something similar to last quarter.

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I'd recommend attending as many UA sessions as possible! Even if you dont have any particular questions, just listening and walking through questions helps build a better understanding of the material

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Since such a little amount of H2O is ionized, it's concentration will pretty much stay the same making it insignificant.

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The first midterm in 14a had questions with varying points so I think they would just decrease the amount of points each question is worth. I'm sure we will get more information when the time comes.

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The only thing that can change the equilibrium constant is a change in temperature.

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I was a little confused on how to go about this problem, can someone help me out please?

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Another thing I would like to mention is to don't be afraid to ask questions! This was created so that we can engage with one another and help each other out. If there's something you don't know, chances are someone else is having the same problem. Tip: When posting a question, try posting it in the...

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Exams will take place during lecture instead of discussion, I discussed it with a TA and they said that this would be better because we would essentially have more time in discussion to ask questions and go over materials.

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Professor Lavelle has provided us with so many resources that I often took for granted last quarter. The UA sessions are extremely helpful and help with any lingering questions. Coming from someone who didn't do amazing last quarter, I'm definitely going to be utilizing these resources so hopefully ...

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Thank You!! This is going to help a lot!

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I think watching videos about the main concepts will be sufficient enough to maintain your knowledge about 14a.

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Hopefully, this helps as well!

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I took a look at the list of Strong Acids/Bases included in the Sapling HW and there's a note beside HClO3. It states "Some sources classify HClO3 as a weak acid. Check with your textbook or instructor to determine how to classify this acid.". Just to clarify HClO3 is still considered a st...

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It can get overwhelming when you spend hours focusing on one course. just like a previous person mentioned, try working in increments of 1 hour with breaks in between. Try changing your scenery if you can. Remember to take breaks, eat snacks, and move away from the screen periodically. We're almost ...

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I've tried multiple times to turn in the course evaluation for Chem but it never actually submits. I was able to submit the rest of my evaluations. Is anyone else having the same problem?

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Thank you! I was just looking for some more reliable videos/resources that can help in the final. This will help a lot!

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CCLE posted that they have restored the servers and VPN service. If you're still having trouble with the website I'd recommend contacting IT Support at 310-267-4357 or help@it.ucla.edu.

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I'm going to do most of my studying by practicing textbook problems. The one thing I will suggest is to not overwork yourself! As hard as it may seem to do because our grades are on the line, it's important to take breaks. Stay safe everyone.

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Are all their videos this helpful? I would usually try to look up practice problems but this was extremely helpful!

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How can some ligands bind from multiple sites?

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I'm a little confused as to how long the final is going to be because the syllabus says that the final is 1 1/2 hours but MyUCLA says it's 3 hours. Does anyone know the official time frame?

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Savana Maxfield 1G wrote:Are your TAs allowing you to see each question on the midterm and which ones you missed?

From my experience, I was able to see each question on my midterm and the ones I missed. The ones that I was still unsure about were explained by my TA!

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I held off studying for the previous midterm because of issues occurring in my household and boy was that a mistake. The best thing to do is to start studying as early as possible to that you don't cram anything and feel well prepared instead of nervous.

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The best advice I can give is counting how many valence electrons there should be and to make sure to find the number of electrons needed to fill their octets when applicable.

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A good thing to remember is that carbon is tetravalent which means it will always form 4 bonds. So carbon will be bonded to 3 hydrogens and one oxygen. The oxygen will have the remaining hydrogen bonded to it.

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Just like everyone was saying, cations have a positive charge and anions have a negative charge. But if you want to rewatch the professor's lecture where he explained it, it would be lecture #11!

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From what I read on bruin walk, it seems like the "labs" are videos of the TA's doing the experiments. The reports were based on data provided by the course, maybe it's something like data mining. I recommend looking at the reviews on bruin walk, they even have labels that say if the stude...

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Honestly, I'm just glad I got it over with. It's definitely important to take care of our mind and bodies so make sure to do something you enjoy post-midterm. A well-deserved sleep always works for me.

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Heavier atoms and molecules experience stronger London dispersions than smaller ones. I do believe they are present in all molecules though.

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In order for covalent bonding to occur, the central atom must have enough available electrons to form at least two bonds. Hydrogen atoms have only one electron and can form only one bond.

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I think it's important not to stress too much about grades right now considering we barely passed the halfway mark. We have another midterm and final to try to get our grades in a better position. We got this!

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I received an email from my TA during the week that said we should have white scratch paper, a periodic table, and the equations sheet. I think you should print out the equations sheet just to be safe.

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Does anyone know if there is a way to get subtitles on bruin cast? My other classes have them but I've never been able to use them for chem lecture.

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No, this midterm covers content post MT1 through chemical bonding (Outline 3).

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Does anyone know if there's going to be any extra credit opportunities?

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Electronegativity relates to the ability of an atom to attract electrons to itself. Electron affinity is the energy change when an electron is added to an atom. So they are connected in a way!

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I think an important thing to do is to not overwork yourself. Not only will this make you less productive but it may also affect your health so remember to take breaks and to look away from the screen when you can. Times are tough and there's no denying that school just isn't the same but it's very ...

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Has the professor sent out an email or mentioned if there's going to be lecture on Wednesday?

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Does anyone know how the test was graded? I'm a little confused about how we got decimals as our scores if it was all multiple choice. Was there partial credit of some sort?

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I want to review the questions but I don't really remember what the questions were so how would I look for them in the textbook?

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Sweet! Thank you!!!

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So you know that this is the Balmer series because of the visible blue line which means n1=2. Use the rydberg equation of v=R( (1/n1^2) - (1/n2^2) ). We know frequency equals c/λ. Make sure to convert the wavelength to meters. Once you plug in all your values, you should be able to solve for n2.

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One of the Sampling Q's explained that we needed to use Avogadro's number but I'm not too familiar with it. What is it and when should we use it?

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Neither a wavelength or frequency can be negative. It can be a bit confusing because in the Rydberg Equation the results can be negative or positive. This just expresses how the energy would be released (higher to lower energy level) or absorbed (lower to higher energy level).

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I've thought about this too! Here's a video I found to be pretty interesting. https://youtu.be/qbdx2nOQKKo

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Hey! I'm having a little trouble understanding the topics of atomic and ionic radius. Can someone break it down for me? Thank You!

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The best thing to do is to ask for help! Email your TA if you have any questions and try to attend workshops. Most importantly do not overwork yourself, take breaks when studying, and move away from the screen so that your eyes arent overworked.

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Dr. Lavelle sent out an email that said the midterm covers up until 1D.2 in the textbook.

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I know we only have to focus on questions #1-19 on SAPLING for the midterm but there were people saying the order is different. Do we still have to worry about our sapling problems being in a different order or has this been resolved already?

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Some people are still having trouble logging in but I heard if you log into MyUCLA and click the class website it opens up CCLE.

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My TA said before turning in the test, there's going to be a review section similar to when you turn in an assignment on CCLE. I hear it will not curved.

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I had to use Respondus once but during that exam, we had to keep our mics and cameras on. It's pretty much a monitoring system and if I remember correctly, it would just let the instructor know if something happened like if you were out of the frame for a little bit, etc.

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I think it would be best to carry all decimals throughout the calculation and then the result should be rounded at the end. You'll get the most accurate sig fig that way. I have no idea about the second part

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I'm not entirely sure what the midterm is going to look like but I heard there's going to be multiple choice questions. We're going to go over our set up for the midterm during discussion next week so hopefully we can get a better idea!

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1 Nanometer is exactly 1 x 10^-9 meters.

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I was pretty confused about the whole situation as well but I know respondus has a camera system integrated using our laptop camera. So does that mean we're going to be using Respondus on one device and our phones will be using zoom?

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One thing I'm still not really sure of is how many zeros after a sig fig on the right side of the decimal point are sig figs. For example, if I was to determine asked for 0.320 and 0.3200, would they both have three sig figs? Any trailing zero where a decimal point is shown would be significant. So...

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