CHEMISTRY COMMUNITY

Teti Omilana 1G

The difference is that molar heat capacity refers to 1 mol of a substance and specific heat capacity refers to 1 gram.

Teti Omilana 1G

Most likely about a week from today.

Teti Omilana 1G

Because it is the energy required to break a bond, so that value must be positive.

Teti Omilana 1G

140 points

Teti Omilana 1G

The time change should be automatic!

Teti Omilana 1G

Heat isn't a state function because it depends on pathways, and enthalpy depends on the initial and final states.

Teti Omilana 1G

In an isothermal reaction (when temperature is constant).

Teti Omilana 1G

Catalysts are present at the beginning and end of a reaction, intermediates are at the beginning of the reaction but used up by the end.

Teti Omilana 1G

They are used interchangeably

Teti Omilana 1G

The reaction rate is not dependent on the reactants.

Teti Omilana 1G

An intermediate is made in the middle of a reaction, and is not present at the end.

Teti Omilana 1G

Go to as many UA sessions as possible!

Teti Omilana 1G

since p=(-log), you can use the log rules: log(pka)+log(pkb)=pka*pkb

Teti Omilana 1G

I'm pretty sure you can use any calculator for exams!

Teti Omilana 1G

state functions only focus on final and initial values, rather than the path taken.

Teti Omilana 1G

you should have 50 posts by Sunday.

Teti Omilana 1G

That should be given.

Teti Omilana 1G

Q and K are both products over reactants, but K is used at equilibrium while Q is used at any other point during the reaction. If Q=K, that means the reaction is at equilibrium.

Teti Omilana 1G

Last quarter we had a review lecture on the Friday of Week 10, so hopefully that happens again but I'm not entirely sure.

Teti Omilana 1G

a 50%, or a 200/400 is needed to pass.

Teti Omilana 1G

I found the final to be harder than the midterm just because of all the content covered.

Teti Omilana 1G

We'll still be able to use TA office hours to ask questions, and sometimes reading through examples in the textbook helped me this quarter. I am also really gonna miss the UA sessions though :/

Teti Omilana 1G

I'm pretty sure you are supposed to always use Kelvin for this class.

Teti Omilana 1G

Yes, they do mean the same thing.

Teti Omilana 1G

You can ask any TA in their office hours to review your exam with you.

Teti Omilana 1G

A state property does not depend on the path taken, and rather only on the initial and final values.

Teti Omilana 1G

An example of a closed system would be a sealed beaker, therefore matter cannot go in and out. But this does not mean its insulated, so heat can still exchange with its surroundings.

Teti Omilana 1G

An adiabatic system has no heat flow so q=0.

Teti Omilana 1G

Open system - matter & energy can exchange w/ surroundings
Closed system - energy can exchange w/ surroundings
Isolated system - nothing exchanges w/ surroundings

Teti Omilana 1G

Week 7 x 5 so 35 posts! Or 85 counting last quarter.

Teti Omilana 1G

Not all of them but I think some of them come directly from the textbook, and the rest are at least similar.

Teti Omilana 1G

Yes, you would assume 25 degrees celsius.

Teti Omilana 1G

I pretty much spent the weekend watching iCarly and catching up on sleep. Have another midterm on Wednesday though so it's back to studying unfortunately :/

Teti Omilana 1G

The week 3/4 homework was extended a week to be due this coming sunday.

Teti Omilana 1G

I don't think Lavelle mentioned a curve on midterms, last quarter he gave an extra 10 points on the final though so hopefully he does that again this quarter.

Teti Omilana 1G

I'm taking it next quarter so that 14A/4B material is still fresh in my brain.

Teti Omilana 1G

Last quarter I missed a couple weeks but I made sure to have 50 by the end and my score was updated to get full credit. So you should be able to make them up.

Teti Omilana 1G

Lavelle just sent an email that says they should be released by late tonight.

Teti Omilana 1G

Yes, we assume it's at 25 degrees celcius.

Teti Omilana 1G

I definitely thought this midterm was harder than the 1st midterm we had for 14A. There were a lot more enthalpy problems than I anticipated, and the wordiness of the longer problems threw me off a little. I also thought these problems were more difficult than the ones we went over in UA sessions, b...

Teti Omilana 1G

There are no lectures or discussion sections on Friday

Teti Omilana 1G

Yes, I don't think it matters what order since both classes have the same pre-reqs.

Teti Omilana 1G

Textbook problems were the most useful to me last quarter, the format of them is very similar to the ones on exams.

Teti Omilana 1G

It would shift towards the products (right) in order to maintain equilibrium. It always shifts in the opposite direction that moles were added.

Teti Omilana 1G

Ka is the equilibrium constant used for acids and Kb is the equilibrium constant used for bases. You solve for them in the same way you would Kc (P/R).

Teti Omilana 1G

It does grade on accuracy but you have an unlimited number of attempts to get the correct answer.

Teti Omilana 1G

You shouldn't choose the one that is negative or that is too big to make sense in the context of the problem.

Teti Omilana 1G

The smaller one makes more sense in the context of the problem.

Teti Omilana 1G

That means the reaction shifts towards the left side, a.k.a. there are more reactants than products.

Teti Omilana 1G

Units were left in atm based off of Lavelle's examples.

Teti Omilana 1G

Kelvin is the SI unit for temperature.

Teti Omilana 1G

Last quarter going to the UA sessions was really helpful for practice questions and reinforcing topics, especially before exams.

Teti Omilana 1G

Exams are taken on Friday during your lecture time

Teti Omilana 1G

Yes, he said by Saturday!

Teti Omilana 1G

I think the most important thing for me will be to watch lectures as they come out, cramming watching lectures only a couple days before the final was very stressful and I ended up rushing to memorize all the information instead of actually learning it. I also want to start going to UA sessions each...

Teti Omilana 1G

Playing my own music usually results in me singing along or getting distracted, so if I really need to focus I look up any soft instrumental playlist on spotify and just press shuffle. I also have found that bossa nova music really helps me feel relaxed and study better, you could probably find some...

Teti Omilana 1G

Acid rain can be caused by naturally existing chemicals in the atmosphere, but is primarily caused from the burning of coal or fossil fuels which releases sulfur and nitrogen oxides into the air. These then react with H20 already present in the atmosphere which produces the acidic rain that can be h...

Teti Omilana 1G

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

this is the one

Teti Omilana 1G

The molecule with the greatest covalent character means the smallest difference in electronegativity between the two elements.

Teti Omilana 1G

Yes, they will be the same format as the midterms.

Teti Omilana 1G

Not sure if it's all, but I've definitely found that on our midterms some questions were taken verbatim from the textbook so it probably helps to do all the practice problems.

Teti Omilana 1G

Lavelle said that most of the material would be on the quantum world since that's what we spent the most time on. The other material will probably be distributed based on how much time we spent on it as well.

Teti Omilana 1G

Thank you! Good luck to you too :)

Teti Omilana 1G

Memorizing them would be very helpful.

Teti Omilana 1G

Is there somewhere where we can see the correct answers/work for midterm 2?

Teti Omilana 1G

I'm pretty sure a 50% or higher is passing for this class, and generally a 90-100 is in the A range.

Teti Omilana 1G

You also can draw the lewis structure for the molecule and look for asymmetry. If it is asymmetrical, it's polar and if it's symmetrical it's non- polar.

Teti Omilana 1G

Lavelle will probably let us know closer to the exam date. Like Amanda already said the syllabus doesn't specify anything about content distribution, only that it is cumulative.

Teti Omilana 1G

The week 7/8 homework is due tonight at 11:59!

Teti Omilana 1G

We do technically have Thursday and Friday off, but like someone said above since we still had lecture posted on Veteran's day we probably will also have the same thing happen on Friday. :/

Teti Omilana 1G

I also felt that this midterm was much harder than the 1st, but I think that it'll help to really grind out over the topics you didn't understand from this section over the next couple weeks and hopefully do better on the final, since that takes up a good portion of our grades.

Teti Omilana 1G

I like to watch my favorite shows, sleep in--essentially just do nothing can be the greatest relaxer tbh.

Teti Omilana 1G

Midterm scores should be posted this Wednesday! Assuming it will be released the same time it was for midterm 1.

Teti Omilana 1G

The final is cumulative covering material from the entire quarter.

Teti Omilana 1G

I'm pretty sure you have until week 9 to change your grading to P/NP, so my advice would be to maybe wait until you have a good understanding of where your grade is at in the class before you change it. But make sure to double check your major requirements!

Teti Omilana 1G

I have a friend that took this chem series last year, and she took 14b and 14bL in different quarters! so you should be fine they don't have to be taken simultaneously.

Teti Omilana 1G

Yes, the constant c is always going to represent the speed of light in that equation. (c=3x10^8 m/s)

Teti Omilana 1G

It's the same amount of time but less calculations, so most likely less time consuming.

Teti Omilana 1G

No, we aren't allowed to have annotations on our sheets during the actual midterm but it helps to annotate on a practice copy to cement them in your head before the exam.

Teti Omilana 1G

Can someone elaborate on the step-up sessions, I'm kind of confused about what happens in them. Are they worthwhile? Thanks Step-up sessions have been really helpful for me! It's especially useful for understanding the basics before moving on to more complex problems. At each session the UA's have ...

Teti Omilana 1G

I also didn't take AP chem in high school, and I find myself in your situation pretty often during lectures. If something is confusing to me, it usually helps to attend TA office hours so I can ask specific questions. And like other people in this thread said, khan academy videos or quick youtube le...

Teti Omilana 1G

What works best for me is making sure that I separate the places where I study vs where I relax. Personally working in my room is very distracting for me, so if you have an office or extra space in the house that you can work that might help. Another thing I do is using the "downtime" feat...

Teti Omilana 1G

I was also wondering this, should we just go to TA office hours/drop-in sessions and ask on our own or is there a session specifically dedicated to midterm review?

Teti Omilana 1G

Hydrogen bonds only occur with N, O, or F because they have to be bonded to a highly electronegative atom. Nitrogen, Oxygen, and Fluorine are the only atoms with a high enough electronegativity for this to occur!

Teti Omilana 1G

To avoid spending money, I think most TA's let you use zoom on your phone as long as they can see your whole workspace.

Teti Omilana 1G

Are results posted for everyone yet? I can't see mine on CCLE.

Teti Omilana 1G

I don't know if this will help you, but in HS they taught us the mnemonic "King Henry Died By Drinking Chocolate Milk Monday Night" (kilo, hecto, deka, base, deci, centi, milli, micro, nano) to memorize the order of the SI units.

Teti Omilana 1G

Like everyone has been saying, the v for frequency is written in cursive and for velocity it is not. If you forget that you can always look at your units: frequency (hz), velocity (m/s).

Teti Omilana 1G

Hi, just to go off this question where can we find the list of equations/constants that we need for the exam?

Teti Omilana 1G

How are you guys checking your answers for even # problems?

Teti Omilana 1G

I also would second doing the homework problems if nothing else, because Lavelle has said those questions will be put on exams. But other than that reviewing the audio-visual modules can help really cement in certain topics, along with doing the UA worksheets from step-up sessions as extra practice.

Teti Omilana 1G

Doing the audio-visual focus topics before watching lecture really helps so that you already have a basic understanding of concepts before he goes over them.

Teti Omilana 1G

Do we only focus on up to 1D on outline 2 or is all of outline 1 also included for the midterm?

Teti Omilana 1G

Like previously stated, the only time a number would apply to both elements is if it's used as a coefficient (e.g. 2CO; C=2, O=2). So in that example since the 4 is only after the O, C=1 and O=4.

Teti Omilana 1G

Thanks for the clarification!

Teti Omilana 1G

https://www.respondus.com/lockdown/down ... =228644488
This is the link my TA gave us to download respondus if that's what you were looking for!

Teti Omilana 1G

During step-up sessions can we only go through topics from that week or is any question free game?

Teti Omilana 1G

Sorry just to make sure I have this correct so there is no Sapling HW due tonight?

Teti Omilana 1G

To answer the question from above the extra practice problems besides Sapling are from the book! He gave them to us under the "Outlines" for each unit on the class website and they're also on the syllabus. I'm pretty sure some of those questions are taken straight from the textbook and put...

Teti Omilana 1G

Here is a short video that helped me on how to use it in case you needed a visual! https://rb.gy/jfzyi9

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