CHEMISTRY COMMUNITY

FrancescaHawkins2H

If all of the reactants in a reaction are zero order then yes, I believe the overall equation itself would also be zero order, since it is the sum of the order of the reactants. The rate law then would depend on k. I can't imagine, however, that this would happen very often, although it is possible.

FrancescaHawkins2H

K is just the general term for the equilibrium constant. If you want to be more specific you can use Kc to denote that you got this value through calculations involving concentrations. Alternately, if the K value is calculated using partial pressures, you would denote that by using Kp. Hope that hel...

FrancescaHawkins2H

Dr. Lavelle sent out an email this afternoon stating that not only Chemistry Community but also Sapling points can be made up as long as they are completed by tomorrow (Tuesday) morning, I believe at 9am PST. My understanding is that this means as long as you have made 50 posts and fully completed a...

FrancescaHawkins2H

Chemistry community scores are additive and I believe we have until tomorrow (Tuesday) morning to make up points if we missed any posts throughout the quarter. As long as you have 50 posts for the quarter by then you should get full credit! I was just about to ask when the chemistry community score...

FrancescaHawkins2H

Everything stated in the post above sounds correct for the most part, but I think you would also need to convert J to kJ when finding heat. Additionally, you would divide heat by moles, rather than the other way around.

FrancescaHawkins2H

It doesn't seem to be clear exactly how the grading scale works, so it can be hard to anticipate your final grade. While this makes me a little nervous personally, I think that it is because Dr. Lavelle bases his curve/rounding methods on everyone's grades after the final, as well as on how everyone...

FrancescaHawkins2H

I know that I had over 50 posts on Chemistry Community last quarter, but I don't remember how many exactly. Is there a way to tell how many posts we have done just for this quarter, if the points aren't up to date on CCLE/MyUCLA?

FrancescaHawkins2H

Q is not equal to K because K is specifically the ratio of products to reactants when the reaction is at equilibrium, hence the name equilibrium constant. Q is also the ratio of products to reactants but it implies that the chemical reaction is not at equilibrium.

FrancescaHawkins2H

Chemistry community scores are additive and I believe we have until tomorrow (Tuesday) morning to make up points if we missed any posts throughout the quarter. As long as you have 50 posts for the quarter by then you should get full credit!

FrancescaHawkins2H

While I am planning on taking a class or two this summer, I plan to spend a lot more time outdoors and a lot less time in front of a screen. Staring at my computer for hours on end, whether I'm doing homework or watching lectures or even Netflix, has been taxing, and I am looking forward to the oppo...

FrancescaHawkins2H

I know that a lot of people take notes online but I always hand write my notes for class. It helps me remember because it forces me to focus more on what I'm writing, without letting my mind drift. It also allows me to draw out diagrams and charts by hand, which helps me remember them as well.

FrancescaHawkins2H

I've heard that Chem 14C was asynchronous in previous quarters, but it say "online" in class planner. Does anyone know if the lectures will also be recorded for anyone who might not be able to attend class in person? I would imagine that Dr. Castillo's lectures will be recorded next quart...

FrancescaHawkins2H

I'm so glad I found this thread, I always enjoy Dr. Lavelle's jam sessions at the start of class! I'll definitely miss it next quarter, but I plan to continue starting my personal chemistry studies with some good chemistry vibes. Thanks for the recommendations everyone!

FrancescaHawkins2H

A catalyst only changes the pathway taken to get from reactants to products, by lowering the activation energy needed for the reaction to occur. It does not, however, change the state of the products or reactants, and thus does not change delta H. Hope that makes sense!

FrancescaHawkins2H

An intermediate is something other than the reactants or products listed in the overall reaction, that is needed in order to get the desired products from the reactants. I think the hey point here is that an intermediate will not be present in the overall equation. Conversely, a catalyst will be lis...

FrancescaHawkins2H

I struggle with this sometimes as well, and sometimes find it helps to write out the equation multiple times, using the different R values. We are supposed to use the R which best allows for units to cancel as we need to fit the problem, so although writing them out can be time consuming, it helps m...

FrancescaHawkins2H

That sounds like such a scary position to be in and I can't imagine going through that while also having to focus on college classes, and challenging ones at that! While I haven't been through anything quite like what you described, I have also struggled with staying focused while living in a chaoti...

FrancescaHawkins2H

My understanding is that enzymes are basically biological examples of catalysts. They both work to lower the activation energy of a reaction. However, Dr. Lavelle mentioned something in class about also changing the orientation of molecules so that they can bond. Is this something that only enzymes ...

FrancescaHawkins2H

If you're on the waitlist for a class and worried about getting in, you could always email the professor and ask of they could give you a PTE code.

FrancescaHawkins2H

Other than asking for help from TAs or going to review sessions, I would recommend going over textbook problems. As someone else mentioned above, the amount of textbook problems on the syllabus can be overwhelming, especially since the final is comprehensive. I like to focus first on the topics I fe...

FrancescaHawkins2H

A sealed system does not allow for the transfer of mass but does allow for the transfer of heat. An example of this would be a sealed tupperware. No food can leave or enter, but the food will cool down. On the other hand, an insulated system does not allow for the transfer of either. Insulated syste...

FrancescaHawkins2H

I struggled a lot with the tests in 14A, and I didn't do as well as I hoped on the first 14B midterm. Despite this, I persevered and studied a lot and ended up doing a lot better on the second midterm, which I'm pretty proud of. Hopefully I can keep it up for the final!

FrancescaHawkins2H

I feel like this quarter has gone by so fast! I work as well, and I've been having a hard time finding time to study for this class. Even so, I have found that doing even one or two practice problems if I have time at the end of the day has helped keep it fresh in my mind. Overall, if you have been ...

FrancescaHawkins2H

Personally I think the biggest cause of burnout has been the lack of separation between study time and relaxation time. Because of this, I have tried to limit myself to doing all my work at my desk and only relaxing on the couch or my bed. I have also been struggling to justify taking breaks and let...

FrancescaHawkins2H

I've heard that Chem 14C was asynchronous in previous quarters, but it say "online" in class planner. Does anyone know if the lectures will also be recorded for anyone who might not be able to attend class in person?

FrancescaHawkins2H

I think someone mentioned this above, but truly isolated systems don't necessarily exist (and heat will eventually escape the mug), however, this is a really good example and is super close to one!

FrancescaHawkins2H

I would definitely recommend reviewing the textbook problems listed on the syllabus as this is closest to the format for the questions on the exam, and some questions are even pulled directly from the textbook. I find it especially helpful to study with a friend, or to go over problems that are espe...

FrancescaHawkins2H

Confirm with your TA, but as far as I know, as long as they're all done but they end of the quarter you should be able to get full credit.

FrancescaHawkins2H

Unfortunately Lavelle does not teach 14C, so we will likely not have access to post on Chemistry Community for the class. However, we might still be able to view posts from other students, as we can do now without being logged in.

FrancescaHawkins2H

State properties are measurements that do not change based on the path taken to get the measurement. For example, we could increase and decrease the volume of a container numerous times, but the delta V is still going to be Vfinal-Vinitial, regardless of these intermediate changes.

FrancescaHawkins2H

I would be sure to convert to Kelvin if temperature in given in Celsius because K is the standard unit and is used in most equations involving temperature. However, as someone above mentioned, the unit shouldn't matter if you are using delta T, or the difference in temperature, because the differenc...

FrancescaHawkins2H

Isobaric refers to constant pressure, just as isothermic refers to constant temperature. This can be helpful when looking at which equation to use to solve a problem.

FrancescaHawkins2H

I love finding new fun ways to help me remember little things that often get mixed up in my head. Thank you!

FrancescaHawkins2H

Just in general with chemistry and other science topics I find it helpful to watch videos like Khan Academy and Crash Course, and to find videos that help me relate some more challenging concepts to real life applications/examples. I find that it can be hard to wrap my head around some of these thin...

FrancescaHawkins2H

I definitely struggle with being nervous between taking tests and receiving my results. Fortunately, I have found that lately I am busy enough that that stress is diminished by the stress of other classes/tests/assignments/etc haha. In all seriousness though, I have found that staying busy can be a ...

FrancescaHawkins2H

Definitely gonna miss Lavelle, but does anyone have any advice or tips regarding Professor Castillo for 14C?

FrancescaHawkins2H

I was able to get the answer for this questions but I was just wondering, how do we know to use the initial volume when calculating PV=nRT and solving for n?

FrancescaHawkins2H

I generally feel like I did alright on the midterm, but as some other people have mentioned, I definitely did struggle with keeping my cool and battling test anxiety while taking this test. I'm generally a pretty calm person, but find that I do poorly on tests due to lack of focus. Does anyone have ...

FrancescaHawkins2H

Yes, I believe we are meant to assume that the temperature is 25 degrees C if it is not explicitly stated in the problem.

FrancescaHawkins2H

My understanding is that the general grading scale isn't set yet, and will be decided closer to the end of the quarter depending on how we all do on tests/homework assignments.

FrancescaHawkins2H

I generally feel stressed between taking tests and finding out my grade, but I find that its best to remind myself that I did my best, and focus on other things. If you studied and went through the homework problems, your test grade will probably reflect that. And as someone else mentioned, this is ...

FrancescaHawkins2H

I'm currently taking 14BL virtually with Dr. Casey, and while I do regret missing out on the experience of an in-person lab, I would say that the class itself has been enjoyable. I learn best in a hands-on environment, so my lab skills will likely be shaky after only learning through videos and sim...

FrancescaHawkins2H

I definitely struggled to stay motivated last quarter, and as a result, I fell behind and ended up struggling quite a bit, especially in Chem 14A. This quarter I am determined to stay on top of things for Chem 14B, and have been watching lecture videos during the scheduled lecture times, rather than...

FrancescaHawkins2H

I'm currently taking 14BL virtually with Dr. Casey, and while I do regret missing out on the experience of an in-person lab, I would say that the class itself has been enjoyable. I learn best in a hands-on environment, so my lab skills will likely be shaky after only learning through videos and simu...

FrancescaHawkins2H

Grades will probably take longer to come out because they will be reviewing answers to give some people partial credit for some of the harder problems. Dr. Lavell will likely send out an email telling us when to expect grades to be posted.

FrancescaHawkins2H

There will most likely be a variety of different types of questions involving thermochemistry, to test different applications of our knowledge. Although, I'm not sure specifically what will be focused on other than the problems Dr. Lavelle mentioned in discussing what will be expected on Midterm 1 (...

FrancescaHawkins2H

On the midterm, will we be given the equilibrium concentrations when solving for the equilibrium constant (K)? Or will we be expected to calculate them?

FrancescaHawkins2H

I'm also confused in solving this problem. How exactly do the molar coefficients work when using this method? For example, could 4H2O and 3H2O cancel each other, or would this not work because they have different molar coefficients?

FrancescaHawkins2H

These values should be given as part of the question. What I have found is that usually with Dr. Lavelle's exams, there isn't ever very much we have to memorize. It is more valuable to understand concepts and how to apply them.

FrancescaHawkins2H

As Dr. Levelle mentioned in lecture last Friday, the standard enthalpy of formation of an element in its most stable form is zero. This is why N2 is not taken into account. Additionally, O2 would also have an enthalpy of zero and could be left out.

FrancescaHawkins2H

I'm not sure exactly how many questions will be on the test, but I heard that the format of the test will be similar to 14A, so I would think somewhere around 12 questions or so.

FrancescaHawkins2H

Aside from any scheduled review sessions you could probably reach out to your TA to schedule a time to meet if you have specific questions or topics to go over!

FrancescaHawkins2H

I may have missed it, but I didn't see anything regarding late assignments on the syllabus for 14B. Does anyone happen to know if partial credit is received for Sapling homework completed late?

FrancescaHawkins2H

In my opinion and based on what I've heard from the TA's, going through and fully understanding the textbook problems is key to preparing for the midterm and final exams.

FrancescaHawkins2H

I also did the whole quadratic formula without realizing I could use a square root! Good tip to be on the lookout for for next time though.

FrancescaHawkins2H

I believe that midterms will be formatted similarly to Chem 14A, however, we will be taking them during lecture rather than discussion section.

FrancescaHawkins2H

Just to clarify, does this mean that everyone who gets at least 50% of all points from the quarter will pass with at least a C-?

FrancescaHawkins2H

I am still a little unclear on what would be the minimum needed to pass the class, but I asked my TA before the final if he know anything about what the grading scale would be like for this class and he said that the exact breakdown/cutoffs for grading was still undecided, and that it would be influ...

FrancescaHawkins2H

I find that doing things like cleaning or exercising help me to relieve stress because I am allowing myself to take a break from academics but I still am able to feel like I am doing something productive.

FrancescaHawkins2H

Someone mentioned above that you need at least 50% to get a C- in the class, and I know it says that on the syllabus, but does this mean that everyone who gets a grade above a 50% will definitely pass the class with a C-? Or does it just mean that students who score less than 50% will definitely not...

FrancescaHawkins2H

My understanding is that hard water is hard because it has a higher mineral content. I looked it up and discovered that water is considered hard if it has a pH of 8.5 or above, meaning that hard water is more alkaline. Soft water, then, is more acidic and has a lower mineral concentration.

FrancescaHawkins2H

Lillian wrote:I'm going to sleep until my organs fail, obviously.

This sounds absolutely ideal. I've also been baking ridiculous amounts of cookies to help deal with finals stress and I plan to keep it up over break.

FrancescaHawkins2H

It seems like the class average is pretty high so there probably won't be a curve, but the professor did say in an email that he will be giving everyone an additional 10 points on the final (capped at 180), and he mentioned in a post on Chem Community to expect more good news by the end of the week.

FrancescaHawkins2H

I believe Professor Lavelle said that we will do titrations in 14BL, but we will likely go over them in 14B as well.

FrancescaHawkins2H

T-shaped molecules occur when the central atom has three bonding pairs and two lone pairs, and the angles are slightly less than 90 degrees.

FrancescaHawkins2H

As somebody else mentioned above, while it is important to be prepared for 14B also remember to enjoy winter break and relax a little so we can all come back to 14B refreshed and rested. :) Congrats everyone for making it through the quarter!

FrancescaHawkins2H

Professor Lavelle, This has been one of the few classes that I have taken at UCLA, even including in-person classes, that has provided the amount of support and extra time going over topics outside of class. All of the resources put in place to help us succeed, including the many review hours and TA...

FrancescaHawkins2H

At the end of this quarter, more so than other quarters, I found myself struggling to stay motivated and focused on my classes. Especially for this class, with the lectures being prerecorded, I found that it was a little too easy to let myself fall behind. Does anyone have any advice or tips that ha...

FrancescaHawkins2H

My understanding of a salt is that it is formed through an acid-base reaction and is composed of an anion and a cation, with the cation often being a metal and the anion being a nonmetal.

FrancescaHawkins2H

While finals week is always stressful, it's been nice seeing Christmas lights go up, and wrapping presents and getting excited for the holidays has definitely relieved some of that typical finals week stress. I'm definitely excited for the end of the quarter and I hope everyone has a safe and relaxi...

FrancescaHawkins2H

I think that moving forward I will definitely need to work on more practice problems and more varied applications of different topics because I found myself getting overconfident and then being underprepared on the midterms and final exams when I would see a concept that I thought I understood being...

FrancescaHawkins2H

During the quarter I usually take pretty messy notes from lecture and the textbook, and over winter quarter I plan to rewrite my notes, or at least the essential concepts. This will help me stay refreshed on the material, and will also give me something to reference should I need to in 14B.

FrancescaHawkins2H

I also was super rushed towards the end of the exam. I was feeling good about the test overall, but after guessing on the last few questions, I'm definitely worries about my grade. I do feel a little better knowing that other people struggled with this!

FrancescaHawkins2H

I don't believe we will need to directly calculate Ka and pKa, but it would be best to know the relationships between the two, and understand how they relate to the strength/weakness of acids, as explained above.

FrancescaHawkins2H

My understanding is that pH refers to the concentration of H, or more specifically the concentration of H3O+, whereas pOH is the concentration of OH-. To calculate pH, use pH =-log [H3O+] and to calculate pOH, use pOH = -log [OH-]. To if given one and asked to calculate the other, you should be able...

FrancescaHawkins2H

In my understanding, CO is a monodentate ligand because when one of the lone pairs becomes a bonding pair, it repels the other lone pair, which becomes too far away to create a second bond.

FrancescaHawkins2H

The definition I have in my notes from lecture is that a ligand is any compound that interacts with a transition metal to form a coordination compound/transition metal complex. I'm not sure how this relates to the biological definition but I hope this helps!

FrancescaHawkins2H

Just to clarify, will we be expected to calculate equilibrium constants or just have a basic understanding of them?

FrancescaHawkins2H

The definition I have in my notes is that chelates are complexes containing ligands that form a ring of atoms, including the central atom. Monodentate ligands cannot be chelating ligands because it is necessary for the ligand to bond more than once in order to create this ring structure. Thus, only ...

FrancescaHawkins2H

Just to clarify, are we meant to have the compounds on the chart memorized?

FrancescaHawkins2H

I wish I had advice for how to keep from getting overwhelmed. As far as studying, I find that it works best for me to begin by reviewing material that I feel like I understand the least, and move into reviewing what I feel more confident about.

FrancescaHawkins2H

I may be wrong, but I believe that the exact cutoff or grade breakdown depends on how (or whether) the professor curves the grades at the end of the quarter, based on how most students did, which will likely depend on the final quite a bit.

FrancescaHawkins2H

I find that its been hard to stay focused as the quarter is almost over. I also got a bit discouraged in this class because I did not do as well on the midterms as I had hoped or thought that I did. Regardless, I plan to study extensively for the final and hopefully end the glass with a good grade.

FrancescaHawkins2H

Personally, when I need to cover a lot of information I like to break it up into chunks, or different sections. I find that this makes it a little easier and less overwhelming to tackle it all. I generally start by reviewing the material I feel the least confidant about and then progressing from the...

FrancescaHawkins2H

I'm not sure how the specific structure will be for this class, but as someone else mentioned above, usually classes emphasize new material on the final but still include some older material to make sure that we retain information throughout the quarter.

FrancescaHawkins2H

A couple people have mentioned changing grades to P/NP, but I'm wondering if this will affect how this class counts towards major requirements, or qualifications/prerequisites for classes in the future.

FrancescaHawkins2H

I had gotten a little discouraged after the first midterm but I studied more and I feel a lot better after the second midterm this week. Hopefully we all did well and can finish out the quarter strong. Good luck everyone!

FrancescaHawkins2H

Thank you guys for the advice!

FrancescaHawkins2H

It says on the syllabus that out final will be 1 hour and 30 minutes, so I'm curious whether it will need to be proctored in the same way as the midterms, and if there will be flexibility on when we can take it, based on our various schedules. I'm in lecture 3 and it also says on MyUCLA that the fin...

FrancescaHawkins2H

My understanding of what was said in lecture is that the arrow will be pointing towards the more negative side. This is because the electrons are being pulled to this side, which is what gives that part of the structure a partial negative charge, due to the negative charge that electrons have.

FrancescaHawkins2H

Also, someone mentioned above that Lavelle is dropping 10 points from the first midterm to make it out of 100 rather than out of 110, does anyone have more information to confirm/deny this?

FrancescaHawkins2H

I am especially worried about my grade and the upcoming tests because I didn't do as well on the first midterm as I had hoped. Regardless of my knowledge of the material, I generally perform poorly on tests, especially when stressed, so I have been working on calming strategies and breathing techniq...

FrancescaHawkins2H

This may be answered somewhere and I missed it, but do posts on the weekend count for points for the preceding week or the following week?

FrancescaHawkins2H

I’m considering taking Chem 14B and Chem 14BL both next quarter and I’m wondering if anyone has any advice, whether this is cautioned against or if it should be totally fine. Let me know if you have any thoughts!

FrancescaHawkins2H

Attendance/participation is not factored into our grade, so the only issue with missing discussion section would be missing the information presented by the TA. My TA posts the slides on his CCLE site, so I haven't found this to be a problem.

FrancescaHawkins2H

I imagine if a large portion of the class was struggling than there might be extra credit offered, however, the average on the first midterm seems pretty high so I'm not sure that there will be. I haven't heard anything definite, this is just my best guess.

FrancescaHawkins2H

I think this was asked previously in the chain but will midterm grades be curved? Or will overall grades be curved at the end of the year?

FrancescaHawkins2H

I see that the grades are posted on CCLE, but will we be able to see which questions we got wrong so that we can know where we made mistakes?

FrancescaHawkins2H

I'm wondering whether only some questions have the potential for partial credit or if they all did, especially given that people got different versions of the exam.

FrancescaHawkins2H

I believe the professor mentioned the particle in a box model just very briefly, but said that we do not need to know/understand it for the midterm or this class.

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