CHEMISTRY COMMUNITY

Jalyn 3G

Hey Nicole, Using the Nernst equation would really help in understanding what these changes would do. Also since a concentration cell by definition has an E naught equal to 0, I'm writing a simplified version without E naught. E=-\frac{RT}{nF}lnQ I'm also gonna use Ag+ as an example, so I've writte...

Jalyn 3G

When neither of your half-reactions contains a metal to act as a conductor, you would use Pt(s) as an electrode.

Jalyn 3G

If we are allowed to have roommates, I'm definitely planning on dorming. If not, I'll probably move into an apartment in Westwood.

Jalyn 3G

I'm definitely a huge advocate for organic chemistry tutor! His explanations are really easy to understand, and he works out examples to practice along with.

Jalyn 3G

If you haven't already spent a little bit of time studying/reviewing each day this past week, I would recommend doing as many textbook problems as you can on Saturday. Do every other problem assigned in the outlines, and if you have time left over, do the rest. Good luck!

Jalyn 3G

The final review sessions are really helpful; I definitely recommend going! Are the final review sessions enough to do well? Or do you recommend going through all the outlines? How do we know which outlines are the most helpful for the exam? I find the review sessions to be helpful, but I definitel...

Jalyn 3G

We’ll be finishing content this Wednesday, and yes, we should review every topic we’ve covered since the beginning of the course, including chemical kinetics.

Jalyn 3G

I hand write my notes, either on paper or on my
iPad.

Jalyn 3G

I’ve been feeling pretty burnt out and unmotivated to do school work lately, but just trying to maintain an overall balance between school and social life/self-care works best for me.

Jalyn 3G

While I believe the final will focus more on the newer topics we’ve learned, we will still be tested on everything else we’ve covered throughout the course. Since we covered thermodynamics for a long time, I think we can expect to see a lot of questions on that.

Jalyn 3G

my favorite song at the moment is american boyfriend by kevin abstract

Jalyn 3G

I did better on Midterm 2 than on Midterm 1. I’m nervous for the final, but I’m just trying to do chem every day until then to ensure that I’m not cramming the last few days before the exam. Good luck everyone!

Jalyn 3G

The final reflected the types of questions asked on the midterms during 14A, so just doing and really understanding the textbook problems is important. Attending UA sessions is helpful as well for review and extra practice.

Jalyn 3G

I’m redoing all of the textbook problems from the outline. Other than that, attending UA sessions would be a good idea for extra practice/review.

Jalyn 3G

I recommend Norwegian Wood by Haruki Murakami & A Thousand Splendid Suns by Khaled Hosseini!

Jalyn 3G

Yes, the final is cumulative, so everything from weeks 1-10 will be covered on the exam.

Jalyn 3G

I definitely recommend Organic Chemistry Tutor on youtube as well! His videos really help clarify any confusion when you’re learning new topics.

Jalyn 3G

congrats everyone! hope you all had a restful weekend!

Jalyn 3G

I love sushi & tacos

Jalyn 3G

I’m taking chem 14bl, soc 1, & ls 7a

Jalyn 3G

I'm working through the textbook problems and making sure I can thoroughly answer every bullet point on the outlines. Reviewing sapling homework is really great too. If I have time (and not feeling lazy), I try to attend UA sessions for extra support.

Jalyn 3G

currently binging gossip girl & attack on titan!

Jalyn 3G

You need a 50% (200/400) to pass with a C-, however, if you're doing P/NP grading, keep in mind that a C- is considered a no pass, so you'll need to get at least a 73% for a C in this class to get a pass.

Jalyn 3G

I definitely feel nervous, but I'm just going to try to prepare as much as possible with the few days we have left and hope for the best.

Jalyn 3G

I typically stick to a schedule and have a to-do list for each day. As for relaxing and self-care, I like to go for midday walks to give myself some time to get some fresh air and clear my head for a bit during the day. I also try to get as much sleep as I can every night.

Jalyn 3G

Thanks for the tips! They're really helpful :)

Jalyn 3G

Would people recommend taking 14BL with 14C in the same quarter or should I take 14C during spring and 14BL during the summer?

Jalyn 3G

Thanks for sharing; that's really interesting!

Jalyn 3G

Sapling is definitely helpful. Reviewing the solutions for a step-by-step explanation helps me understand/solidify everything.

Jalyn 3G

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 10.5 K. Calculate the amount of heat q required to bring about this temperature change, and find the corresponding total change in the intern...

Jalyn 3G

Live Laugh Lavelle :)

Jalyn 3G

r&b, indie pop, & rap are my favorite! when I'm doing work/studying, I love listening to classical music :)

Jalyn 3G

love the positive vibes. I spent the rest of the day just relaxing and watching Netflix :)

Jalyn 3G

Last quarter, scores came out about a week or two after the exam. Like everyone else said, Lavelle should send out an email to let us know when they've been released.

Jalyn 3G

I'm taking 14BL next quarter as well.

Jalyn 3G

This is what I got: 6.3×10^−6 = x^2/(0.10-x) x<<0.10 bc Kb is small 6.3×10^−6 = x^2/0.10 x = sqrt(0.1 x 6.3×10^−6) x = 7.94x10^-4 Since its a weak base you can assume the equilibrium equation would look like x^2/0.1 This should be your only mistake and your x value was probably just a little bit of...

Jalyn 3G

I find completing all of the textbook problems to be the most helpful for me. Attending UA sessions are also really nice, especially if you have questions/confusion.

Jalyn 3G

The amount of questions is still unknown, but we can expect the exam to be around 50 minutes.

Jalyn 3G

Yes, we are allowed to use scientific/graphing calculators on our exams.

Jalyn 3G

If the kb of a weak base is 6.3×10^−6, what is the pH of a 0.10 M solution of this base? So after getting x^2/(0.10-x), my value for x was 0.0024. I then plugged 0.0024 into the equation for pOH (pOH = -log[OH-]) and subtracted that from 14 to get my pH. However, my answer for pH was incorrect and I...

Jalyn 3G

Cooper Kinne 2E wrote:We'll still be in a zoom call with our TA, though, right?

Yes, I believe that we are supposed to join our TA's zoom call during lecture to take our exam using the same set-up as last quarter (laptop with respondus, phone/external webcam joining zoom to show your workspace, etc).

Jalyn 3G

All of the UA sessions are super helpful. I think finding what kind of session is the most important (workshops, step-ups, drop-ins). I've only been to Justin's, Michael's, and Kate's (mainly because their sessions align with my personal schedule) and they're really great and helpful.

Jalyn 3G

I think it depends on your TA. Some check every week to see if you've made 5 posts per week or they'll check at the end of the quarter to see if you have 50 posts in total. I think completing 5 posts by Sunday of each week is a good goal to have just to be safe and less stressed, so you don't feel o...

Jalyn 3G

UA sessions, textbook problems, & reviewing sapling homework definitely help with practicing (the more practice the better for this class). Reviewing conceptual stuff from reading the textbook or watching videos is also helpful.

Jalyn 3G

harry potter, coraline, & kung-fu panda (lol) are my comfort movies!

Jalyn 3G

Hello! You would multiply the two concentrations of the reactants (.7-X) to receive a quadratic equation, and then multiply this equation by the value of Kc. Finally subtract the value of [HI]^2 (which should be 4x^2) from the left so you would have your final quadratic equation equal to 0. You can...

Jalyn 3G

When asked for partial pressure, use Kp. When asked for concentrations, use Kc.

Jalyn 3G

It depends on the UA. Most will either have you email them after the session, post the answer key on chemistry community under the ChemMod user, or they'll give you a link to it during the session.

Jalyn 3G

At a certain temperature, the equilibrium constant, Kc, for this reaction is 53.3. H2(g)+I2(g)↽−−⇀2HI(g) Kc=53.3 At this temperature, 0.700 mol H2 and 0.700 mol I2 were placed in a 1.00 L container to react. What concentration of HI is present at equilibrium? So I used the ICE table technique, in wh...

Jalyn 3G

It depends on the person, but you should try to attend as many as possible since they're super helpful. I'm planning on attending 2 per week, as that works with my schedule.

Jalyn 3G

yeah I think lavelle messed up during lecture. hard water is alkaline and soft water is more acidic.

Jalyn 3G

not entirely sure but I think only the C- grade (50%) is curved and the rest follows the standard grading, so a C would be 73%, an A- would be 92%, and an A would be 93%

Jalyn 3G

organic chem tutor & khan academy are my go-to's

Jalyn 3G

I'm doing the textbook problems, attending UA review sessions + completing their worksheets, and reviewing my notes for conceptual sutff

Jalyn 3G

literally just sleep and chill with my family

Jalyn 3G

Yes, I believe you use your TA's discussion link for the final

Jalyn 3G

thank you so much! your sessions are the best! :)

Jalyn 3G

week 8 and 9 were pretty productive weeks for me, so I'm hoping my productivity keeps up for week 10 where I'll be studying for finals

Jalyn 3G

just gonna attend as many review sessions as possible and complete all of the textbook problems

Jalyn 3G

can't wait for finals to be over

Jalyn 3G

Does anyone know if Dr. Lavelle is going to unlock the two previous midterms--so we can review the problems? I'm not sure, I think that as of right now the only way to see the previous midterm questions is going to office hours with your TA and even then they'll just read out the questions instead ...

Jalyn 3G

Thanks everyone. Your explanations of looking at electronegativity and polarity helped a lot.

Jalyn 3G

LaurenChoi_1J wrote:
Jalyn 3A wrote:When are we supposed to take the final? Is the final open for 24 hours or is it only open during a specific time window?

I believe it is only open during a specific time window. The final is on December 13th from 11:30 am to 2:30 pm (At least that's what is says on the ucla page).

Okay, thanks!

Jalyn 3G

When are we supposed to take the final? Is the final open for 24 hours or is it only open during a specific time window?

Jalyn 3G

I’m redoing all of the textbook problems and completing the ones assigned to us in our outlines. I’m also attending UA workshops to practice with their worksheets.

Jalyn 3G

How do you determine where the negative poles are on a molecule?
(Sapling Q10: Where, approximately, is the negative pole on each of these molecules?)

Jalyn 3G

I like to do pilates and HIIT workouts in the morning and go for walks with my dog when I need an afternoon/evening pick me up.

Jalyn 3G

Hello! Four hybrid orbitals are needed since there are 3 bonded pairs and 1 lone pair, which is given by sp^3. There is one orbital for s and 3 orbitals for p^3.

Jalyn 3G

alebenavides wrote:for the midterm will there also be free responses ?

I think it'll reflect the same format as our midterms, so I'm guessing there won't be any free responses (hopefully!).

Jalyn 3G

Extra credit sounds really nice, but I wouldn't count on it. :/

Jalyn 3G

I like to go for a walk or drive and listen to music. I also like to just watch some Netflix or read to destress after midterms. :)

Jalyn 3G

I think we are allowed to use only the periodic table and equation sheet for this midterm, but stay on the lookout if he sends out an email regarding this.

Jalyn 3G

Organic Chemistry Tutor has been so so helpful for me with understanding conceptual stuff. Going to UA workshops also helped me a lot with applying that information in practice problems.

Jalyn 3G

Orla Lynagh-Shannon 1J wrote:Does anyone know if there is the same number of questions as last time?

UAs have said that there will likely be more questions than last time.

Jalyn 3G

What should we use to study/review? I remember a lot of people said the textbook really helped on the last midterm but I'm not sure. Watch the lectures or review your notes from lecture, do the practice problems from the textbook, do the Sapling homework, and use the UA worksheets for even more pra...

Jalyn 3G

I too am a bit confused whether or not to focus on oxidation numbers. I practiced them however just in case, but during Justin's UA workshop on Saturday, he said that Lavelle will likely not ask about oxidation numbers.

Jalyn 3G

I also did not take AP chem, and the only chem class I took was during my sophomore year (definitely did not retain all of that material since then), so I totally relate. Whenever I don't quite understand a concept or topic, I watch youtube videos (especially the organic chemistry tutor) and attend ...

Jalyn 3G

I'm definitely feeling the same way. I plan on just studying more and dedicating more time to this class to do really well on the next midterm and final. Maybe altering your studying methods and adjusting how much time you spend on the class material might help make a difference on your next midterm...

Jalyn 3G

I get distracted really easily, whether that be because of my phone or family, and so I make sure to always work in my room at my desk where it's the quietest for me. Using a timer for studying and homework definitely helps, as it gives me a little pressure to finish my task in time and it keeps me ...

Jalyn 3G

I definitely have my good and bad days (aka productive and unproductive days). I hope next quarter goes smoother for me.

Jalyn 3G

I would follow green :)

Jalyn 3G

I think that we should expect to have our scores in by the end of this week since there was apparently an error in some versions of the test.

Jalyn 3G

Jonathan Malau 2I wrote:How does partial credit work for this test?

On the test instructions, it says that higher point questions (the 12 point ones I’m assuming) will have partial credit for some incorrect answers.

Jalyn 3G

happy late Halloween! I visited home & watched some Halloween movies with my family :-)

Jalyn 3G

You set emitted electron energy=1/2mv^2 to solve for v. Then you use DeBroglies. I got a slightly diff Ek though...make sure you converted eV to J correctly and subtracted work from photon energy Thank you! That makes a lot more sense. Yes, I made a mistake and I got 6.36 x 10^-17 as my Ek (hopeful...

Jalyn 3G

Imagine a high energy photon of energy 4.00 x 10^2 eV, shines upon a metal with a work function of 2.90 eV. Will an electron be emitted from the surface of the metal? If so, what is the speed of the emitted electron? So I first used E(photon) - work function = Ek to get 6.45 x 10^-17 J. Then I know ...

Jalyn 3G

Yes, as the frequency of light increases, the energy of light also increases. This is shown through a positive correlation on the electromagnetic spectrum, where gamma rays have a higher frequency compared to radio waves. The energy of a photon is proportional to its frequency with the constant h.

Jalyn 3G

I was a bit confused as to what the work function really was. This thread definitely helped; thanks!

Jalyn 3G

I am trying to solidify my understanding of important concepts for each topic, as well as practicing as many problems as possible, whether it's through sapling homework, textbook problems, audio-visual module assessments, or UA worksheets.

Jalyn 3G

I like to watch Netflix, nap, or just chill with my family to relax.

Jalyn 3G

Totally agree with how you're feeling. I think that just reviewing my notes and continuing to practice as many problems as possible, especially for topics I am a bit iffy on, definitely helps. Good luck with your midterm!

Jalyn 3G

I definitely agree. They've been super helpful, especially with the post-assessment questions. During one of his office hours, he said that creating these audio-visual modules are quite time-consuming for him, so we might not see any new ones posted soon. Nonetheless, I hope he continues to make the...

Jalyn 3G

I also believe that monitoring during the midterm will be up to your TA. I think they'll be going over the midterm and how the setup will work in more detail this week during our practice quiz with respondus and our external webcams.

Jalyn 3G

I love taking notes on my iPad with Goodnotes. It's much neater and more organized compared to having to file away a bunch of paper and notebooks. You can easily adjust and customize your notes, and incorporating pictures and diagrams into your notes is so nice. For chem, it's been great as I can wa...

Jalyn 3G

Hi! Being a freshman as well, I'm having a bit of trouble trying to balance the workload of my classes while staying at home. I've found that planning my days and scheduling time blocks where I'll work on homework or study a specific topic I'm struggling on (through reviewing my notes, rewatching le...

Jalyn 3G

BoparaiAdeshsurjit2I wrote:Will the midterm be similar to those? I have also been using those to study?

I believe so, but the fundamental questions from our textbook are supposed to be the most similar to questions on our exams and midterms from what I've been told.

Jalyn 3G

Thank you so much for the advice! Good luck in med school!!

Jalyn 3G

Hey Jalyn! So you are on the right track with converting to the moles of the 2-butanone. You use the mole ratio of 2-butanone to 3-methyl-3-hexanone and the molar mass of the product, which is C7H16O, to obtain the grams of your product. This will give you your theoretical yield. Divide the given a...

Jalyn 3G

Like everyone else has stated, it's not required of you to take notes from the textbook readings. I too prefer to simply read the textbook as opposed to writing notes from the text directly, as most of the content is already covered in lecture. Unless there is an explanation or example from the text...

Jalyn 3G

Consider the nucleophilic addition reaction of 2‑butanone with excess propyl magnesiumbromide, made in situ by reacting 1‑bromopropane with metallic magnesium, to make 3‑methyl‑3‑hexanol. https://content.macmillan-learning.com/cms-nga/590f80587ce697ade4e33015793d0f591a01f962/1755007+reaction+scheme....

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