CHEMISTRY COMMUNITY

Simer_Shera_2D

You can determine reaction order of a substance by using the data where only the concentration of the respective substance changes. For [A], we can use Experiments 1 and 2, since [B] stays the same. In Experiment 1, the [A] is 18.00mmol/L and the reaction rate is 5.94 mmol/L*s. In Experiment 2, [A] ...

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I thought the questions were relatively the same difficulty as the midterms but the amount of questions and span of topics tested made it more difficult.

Simer_Shera_2D

I didn't do too bad but not as great as I'd hoped. Now I'm a little worried about the final since the grading scale is so tight!

Simer_Shera_2D

I'm looking forward to experiencing the true "college life" that everyone always talks about. We've all missed out on the social life and involvement we would normally have as freshmen--the times most people remember as being the "weirdest but most interesting" times of their liv...

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They are not interchangeable since using log will give you a different answer than using ln.

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Cumulative but I think last quarter for 14A we had it formatted so that the amount of material from a section tested corresponded with the amount of time we spent on that section.

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The aqueous solutions should always be closest to the center. Other than that, the cathode is usually on the left and the anode on the right. If I remember correctly, any substances that make up the salt bridge go on the outsides.

Simer_Shera_2D

I've definitely had a hard time figuring out what to get involved in with the online format. It seems like most of the organizations I like are either on a complete hold or have other smaller Zoom meeting events which makes it hard to truly get involved and decide whether you want to stick with it. ...

Simer_Shera_2D

In 14A with Lavelle, we followed the typical grading scale (89-92 A-, 93-96 A, 97+ A+) so I assume this course is the same.

Simer_Shera_2D

I heard everyone is accepted off the waitlist! Also, I know that lots of people switch up their schedules in the first few days of the quarter so if you weren't able to get a spot, there is always a possibility that someone will drop in the months to come.

Simer_Shera_2D

I strategy I found that really helps me is to struggle with the textbook problems for as long as I can before going to a solution manual. Usually, if I'm not able to solve the problem the first two or three tries, I leave it and return to it a couple hours or days later with a fresh mind so I can re...

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I know this class can be pretty stressful given its strict grade scale and dense topics but just remember how far you've come! I've been reminding myself that it's almost the end of the quarter and that we have worked hard learning and interpreting the material presented to us, even in the remote fo...

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I believe you can but you'd have to contact a TA and set up an appointment to dos.

Simer_Shera_2D

The deadline is Sunday at the end of the corresponding week. That means last Sunday (three days ago) would have been counted for Week 7.

Simer_Shera_2D

For updates, I always make sure to open Lockdown at least two hours before a Lockdown exam just to make sure there aren't any updates pending. I don't think I've ever had to update but it's great to check just in case!

Simer_Shera_2D

You can review the midterm with any TA I believe!

Simer_Shera_2D

I believe 50% is a passing score.

Simer_Shera_2D

I'm sure they'll be up sometime this week based on the trends from 14A and last midterm. Good luck!

Simer_Shera_2D

I work 11 hours a week and honestly I agree sometimes its hard to juggle everything , especially during midterm season. Something I find very convenient is to have a planner so that you can map out your midterm and assignments weeks ahead of time using the syllabus. That way, you'll be able ot begin...

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I find the best practice to be completing the textbook problems and then reading the corresponding textbook chapter to make sure you've covered all the content. One thing I highly recommend is to really struggle any harder problems (even if that means revisiting them later) before resorting to the s...

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In all the Sapling problems I've encountered, entropy is always in J while enthalpy is usually in kJ

Simer_Shera_2D

We use different R's depending on the units of whatever you're trying to calculate. It helps to write out a complete equation with units since you can see what cancels and which R is needed to complete the equation.

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You're correct! Positive is when work is done to a system (adding internal energy) while negative is when energy is lost because the system is doing work on its surroundings.

Simer_Shera_2D

Something that I found really works for me is preparing for exams in advance so that I don't have to spend more than 1-2 hours max on a subject a day. I find it hard to retain information when I study for very long periods of time so I usually start studying 2/3 weeks in advance (depending on the ma...

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In the problems I've worked on, I've noticed that we add 1 when the gases are diatomic.

Simer_Shera_2D

For chemistry, a 93 and above is an A while a 97 and above is an A+ (same effect on GPA). A- is 90-92 and is no longer a 4.0 in GPA calculation.

Simer_Shera_2D

A negative value for work implies the system does work on its surroundings!

Simer_Shera_2D

There are several forms of R like others have said. I think for this unit, we use the same one (the one you mentioned) but I'd pay attention to the units when solving problems just to be sure.

Simer_Shera_2D

I like to go through Sapling first after watching lectures and struggling through it so really get a solid understanding of what's going on. Thermo seems to have lots of equations and a broad set of concepts, so the longer sapling problems, although they take a long time, have been very helpful for ...

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I've heard some mixed opinions. I know that virtual seems to be convenient for many people since lectures are asynchronous (or pre-recorded?) and labs are online simulations but I also would love to have the in-person experience of a lab. I'm not sure which is better, but I guess it depends on what ...

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Yes! It is a strong acid.

Simer_Shera_2D

I'm planning on taking it in Fall just to finish the chem series by the beginning of sophomore year but I'm also not planning on doing BL until summer or maybe even sophomore year. It really depends on what's available by my pass time which is the last one (11:00pm) for both first and second appoint...

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I'm not sure whether I'll take it in spring or not. I've heard some people take BL even late into their sophomore or junior year so I don't feel the rush to take it right away. I've also heard it's a lot of work so I'm debating on whether I'll be able to handle it next quarter or if it's better to w...

Simer_Shera_2D

Last quarter we got our grades about a week after the midterm so the midterms could be reviewed for any errors.

Simer_Shera_2D

I think Prof Lavelle only teaches A and B unfortunately. We'll have anothe professor for C.

Simer_Shera_2D

He posted it under "Exam Schedule" on his website. I think he made the change because last quarter the discussion midterm timings were unfair to those who had Monday discussions versus those who had discussions later in the week like Friday. This gives everyone a more equal opportunity.

Simer_Shera_2D

Professor Lavelle just sent out an email with more information on what was covered. We just barely touched Outline 3 so it's not too many sections.

Simer_Shera_2D

Not sure how many questions and we probably won't know until the day of but Prof Lavelle is very generous with timing; I've never felt the need to rush on a midterm.

Simer_Shera_2D

p means -log so pKa = -logKa

Simer_Shera_2D

Prof Lavelle is definitely very mindful about the timing and number of questions. I never felt rushed in midterms, always had time to double check, and was able to leave early for both exams. The final was a little more stressful and I know a lot of people did not have the opportunity to finish but ...

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Although we don't have to memorize anything, I would just pay attention to the states of matter indication in chemical equations when they are given, or if wording like "pure liquid" is used in a problem.

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Usually, there will be a delta H value included in the equation and if that value is negative, that means the reaction is exothermic. Endothermic will have a positive delta H.

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When Q>K, that means that the amount of product is greater than should be at equilibrium so the reaction will shift towards the reactants. When Q<K, the amount of reactants is greater than it should be at equilibrium so the reaction will shift towards the products to reach equilibrium.

Simer_Shera_2D

For both!

Simer_Shera_2D

Unfortunately the audio visual topics are only available for equilibrium from what I heard.

Simer_Shera_2D

Although we've typically seen it in its liquid form and do not use it, if H2O is present as a gas, then use it in the equilibrium calculation.

Simer_Shera_2D

Temperature used in calculation must always be in Kelvin

Simer_Shera_2D

Unfortunately any extra points do not carry over. You'd have to do 50 more in addition to whatever number you left off with last quarter.

Simer_Shera_2D

Yes, I think that is correct since that would imply a ratio of lots of product and little reactant.

Simer_Shera_2D

From my understanding, Kp is when all the products and reactants are gases. If the reaction is heterogenous, then you would use Kc.

Simer_Shera_2D

The lectures are recorded and posted under Media Links on the day of class (MWF). I think Prof Lavelle did not want us to schedule any classes during his lecture because we have midterms during lecture time.

Simer_Shera_2D

Professor Lavelle, Even though we didn't get to have live lectures, I appreciate the effort you put into each class and your attempt to simulate the lecture hall using Bruincast. And let's not forget about the amount of office hours and learning sessions you arranged to fit just about anyone's sched...

Simer_Shera_2D

One thing I'm focusing on is staying motivated throughout the quarter. At the beginning, I was watching all the lecture videos on time and then doing practice problems immediately, allowing myself more time to absorb the material. By the end of the quarter, though, I was cramming all the week's lect...

Simer_Shera_2D

You can set up an appointment time with your TA to review answers for midterms! I believe Professor Lavelle will also be going over popular missed questions some time in his review this week.

Simer_Shera_2D

I think we will enter Zoom and take the exam the same way we've been taking our midterms, except this time, there will be two proctors in the room (your TA and a guest).

Simer_Shera_2D

I would definitely memorize all the strong acids and bases. There are some pretty good mnemonics online to use if you need some help!

Simer_Shera_2D

I believe you schedule a time or visit office hours to go over answers with your TA.

Simer_Shera_2D

I've seen a couple TAs post PDFs of there worksheets on here but not all of them do. I suggest asking someone who may have attended the workshop to see if they can share with you if you're not able to find it, or just email the TA directly.

Simer_Shera_2D

I believe 14B will pick up where 14A left off, so a continuation of acids and bases.

Simer_Shera_2D

Mine is working pretty normally now as of this afternoon; hopefully it stays that way so we can have access to lectures this week!

Simer_Shera_2D

I don't think anything is curved for the course since the syllabus has a point system breakdown. Good luck on the final :)

Simer_Shera_2D

We can't use the ligand sheet so I would focus on memorizing the ones that pop up often in homework problems, like CN and NH3.

Simer_Shera_2D

I don't think the order matters as long as you identify them correctly.

Simer_Shera_2D

I think the order of the ligands doesn't particularly matter as long as in your brackets, the transition metal comes first and anything outside of the coordination complex is outside of the brackets.

Simer_Shera_2D

Hello! I just wanted to drop in and say that although I haven't considered changing my major, I have been using GEs and extra classes as an opportunity to explore other subjects that might interest me. If I find something I love, I might consider minoring in it or even switching my major if it's not...

Simer_Shera_2D

A single bond = 1 sigma bond
A double bond = 1 sigma bond + 1 pi bond
A triple bond = 1 sigma bond + 2 pi bonds
Hope that helps!

Simer_Shera_2D

Chem 14B will have tests scheduled during lecture time according to Prof Lavelle's last email so I wouldn't recommend any overlap with another class.

Simer_Shera_2D

It's cumulative! Good luck :) I'm sure we'll all do great.

Simer_Shera_2D

I didn't have to update Respondus but I would check the night before you have to use it (now for finals).

Simer_Shera_2D

I think the final will consist of everything we've learned so far plus what we'll learn in the next week. It's a cumulative exam.

Simer_Shera_2D

If an N,O, or F atom hypothetically has 2 lone pairs, is it capable of creating 2 hydrogen bonds, one for every lone pair, or just one hydrogen bond. In other words, does the number of potential hydrogen bonds for an atom depend on the number of lone pairs that atom has?

Simer_Shera_2D

This unit is definitely more conceptually-focused than the previous one. I don't think there should be any major calculations since we're expected to know most of the introduced equations conceptually.

Simer_Shera_2D

I don't recall what specifically is covered in those chapters but what I would do is go through each bullet point in the outlines that'll be on the exam make you're solid on the objective. If you're able to explain/answer the outline bullet points, then you should be in good shape.

Simer_Shera_2D

Midterm 2 should cover the last 8 points on Outline 2 and then all of Outline 3, which does not include anything regarding VSPER.

Simer_Shera_2D

Do a test run of Lockdown by opening it up before your exam just to check for any pending updates. If you don't see anything, you should be good to go!

Simer_Shera_2D

A orbital that is half or completely filled is at a lower energy level than having one with 8 electrons and 2 in the s orbital, so d10 is preferred to reach the lowest energy state possible.

Simer_Shera_2D

I remember seeing some problems exactly from the textbook on Midterm 1 so I'll probably be focusing on going through those problems after finishing Sapling.

Simer_Shera_2D

Acids accept electrons and bases donate!

Simer_Shera_2D

Everything up till Wednesday of this week is fair game for the midterm. Good luck!

Simer_Shera_2D

According to Prof Lavelle's last email, this midterm will have more, lower point, shorter questions than the last.

Simer_Shera_2D

Unfortunately, there won't be any audio-visual modules for midterm 2. They were very helpful though, so I hope Prof Lavelle considers integrated them in his future courses!

Simer_Shera_2D

Yes! Prof Lavelle made an announcement on his website that states that the last eight bullet points and all of Outline 3 will be tested.

Simer_Shera_2D

I was watching the Wednesday lecture and noticed that there were many examples of radical lewis structures given. I understand that radical structures don't have enough electrons to make a complete octet so they're highly reactive and have a short existence but what else do we need to know beyond th...

Simer_Shera_2D

I have a friend who is taking 7A and like others have said, it's definitely a lot more of a heavy workload compared to Chem 14A. I think your ability to manage both courses depends on what other courses you're enrolled in (an easy GE maybe?) and what other commitments you have. If you choose to take...

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Nuclear charge increases across a period because as you move across, the number of protons increase while electron shielding remains the same.

Simer_Shera_2D

A lot of the above responses already covered the jist of it so I just wanted to drop an additional resource: https://stack.dailybruin.com/2020/02/05/class-fill-ups/ This is a graph from the Daily Bruin that allows you to find how quickly a class filled up last winter since it's likely this year's en...

Simer_Shera_2D

I think it should unlock later today or in the next couple of days.

Simer_Shera_2D

I heard that Prof Lavelle expects the midterm to cover from quantum number (so the last 8 bullet points) to the end of Outline 3.

Simer_Shera_2D

I spent a good chunk of Halloween catching up on some missed chemistry lectures (I know, spooky right?) while eating lots of candy.

Simer_Shera_2D

I'm pretty sure there is no curve for the midterm or this course. As for partial credit, I think Prof communicated that we will be received partial credit for certain answer choices in some larger problems. We're not sure when the midterm will be graded, though, since there was in error in a questio...

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To my understanding, this class is not curved so the midterm will be grade on a straight scale.

Simer_Shera_2D

Generally, atomic radius gets smaller moving up and to the left of the periodic table as a result of effective nuclear charge. For ionic radius, an atom that has lost an electron (+ charge) is generally going to hold onto its remaining electrons a lot tighter (smaller radius) while an atom that has ...

Simer_Shera_2D

He doesn't have anymore and I don't think he'll be posting them. Hopefully he'll notice how helpful they were and begin implemented them for future quarter.

Simer_Shera_2D

I've heard speculation that it might be later this evening after the last testing section at 3:00pm. Of course, no one knows for sure. Good luck :)

Simer_Shera_2D

Our TA is asking us to enter Zoom through our phones at the time of our discussion and lockdown through our laptops. I think you can log in at your normal time and they'll give everyone 5 minutes to get set up.

Simer_Shera_2D

I don't think anyone knows for sure, but I would study and be ready for it anyways. Also I'm wondering if there is a list of materials we are allowed to use during the midterm? According to his email and information we receive from TAs, I think we're limited to the periodic table, constants sheet, ...

Simer_Shera_2D

I personally struggle with working through problems quickly and with the midterm only being 50 min, my greatest concern is running out of time. The first thing I do is listen to the lecture and take "messy notes", literally just jotting down everything I see and hear. Right after, I make a...

Simer_Shera_2D

Hello!
I noticed in Prof Lavelle's latest email that we can use the back of the periodic table and constants sheet after it's been checked by our TA for scratch work during the midterm. Does that imply that that's the only scratch paper we can use or can we have other blank sheets?

Simer_Shera_2D

Assuming that you have already calculated the answer to part a), you would already know that the energy an excited sodium emits is around E= 3.37 x 10^-19 J Now, the next step is that we covert the of sodium atoms first to moles of sodium atoms and then from moles to total number of atoms by using ...

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After doing many of the textbook problems, I notice that not a lot of them require knowledge beyond what we've learned (like nomenclature and writing equations from diagrams) so I think we won't be expected to know more than the basics. The only section that had some tricky problems like that was on...

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