CHEMISTRY COMMUNITY

BoparaiAdeshsurjit2F

The C means heat capacity

BoparaiAdeshsurjit2F

Whenever there is naught means we are talking about Standard Conditions.

BoparaiAdeshsurjit2F

I heard that they are not opening more spots for 14C.

BoparaiAdeshsurjit2F

The Sapling is due on Feb 28th

BoparaiAdeshsurjit2F

You would plug in all the stuff that is given and solve for the value needed

BoparaiAdeshsurjit2F

I would use the UAs worksheets there is a google drive folder with all the ws.

BoparaiAdeshsurjit2F

The best way to find degeneracy is the (# of positions)^molecules

BoparaiAdeshsurjit2F

I would stick with kelvin as in order to cancel temperature in our formula the gas constants usually have kelvin as the denominator.

BoparaiAdeshsurjit2F

I think Dr. Lavelle said that he will be posting a lecture after the midterm since then we would have only one lecture this week.

BoparaiAdeshsurjit2F

Yes midterm 2 and final will be proctored the same as midterm1.

BoparaiAdeshsurjit2F

Anil Chaganti 3L wrote:Are we allowed to use this on the exam or is it only the equations sheet on your website?

Nope

BoparaiAdeshsurjit2F

I would highly recommend the Organic CHemistry Tutor .

BoparaiAdeshsurjit2F

A Closed system is where the heat can go in and out of the system but the matter remains constant.
An Isolated System is where nothing can go in out of the system including heat and matter.

BoparaiAdeshsurjit2F

Endo/Exothermic reactions are more along the lines of heat transfer not in terms of work

BoparaiAdeshsurjit2F

Okay basically if there is a constant volume this means that the work is zero since the equation to find work is -PdeltaV therefore if delta-v is zero work is zero making internal energy = q

BoparaiAdeshsurjit2F

q=mCAT is used when you given the mass of in grams where the other equation is used when given moles of the substance

BoparaiAdeshsurjit2F

Yes you can go to your TA's office hours to see your exam

BoparaiAdeshsurjit2F

Grades are said to be posted today in the next hour

BoparaiAdeshsurjit2F

Good Luck to everyone exam scores come out today

BoparaiAdeshsurjit2F

I don't have a CC button on my CCLE.

BoparaiAdeshsurjit2F

I heard that it will update accordingly so you do not have to worry.

BoparaiAdeshsurjit2F

Yes basically if you choose an answer close to the actual answer you will get some points.

BoparaiAdeshsurjit2F

They usually take approximately a week.

BoparaiAdeshsurjit2F

When can you assume that the pH of the second deprotonation of an acid is the same as the first? Is it when KA1 is less than Ka2?

BoparaiAdeshsurjit2F

What do you do if KA2 is less than KA1. Does that mean the pH of the first reaction is equal to the second reaction also.

BoparaiAdeshsurjit2F

Does anybody know how many questions are on Midterm 1?

BoparaiAdeshsurjit2F

Neel Bonthala 2G wrote:Hey, yes I think you have to use the reciprocal of the Ka value! Because the reaction involves sodium and propionate, I think you have to use the Kb value instead.

Thank you I appreciate you lol

BoparaiAdeshsurjit2F

Sodium propionate (NaC3H5O2) is used as a food preservative. What is the pH of a 0.020M solution of sodium propionate? The pKa of propionic acid (C3H6O2) is 4.88.

Since I know the pka do I just find the Ka and use that to solve? Or since its for C3H602 I have to find the reciprocal of the KA value?

BoparaiAdeshsurjit2F

What textbook problems should we do for all the thermochemistry stuff we did the last two days because there is stuff mixed from what we haven't learned yet?

BoparaiAdeshsurjit2F

The exams will be on the Friday of Week 4 and Week 7 during the lecture time.

BoparaiAdeshsurjit2F

Yes if you are losing heat from the system,endothermic, the delta h will be negative

BoparaiAdeshsurjit2F

There is new updated constants sheet on the class website.

BoparaiAdeshsurjit2F

Enthalpy is the amount of heat that goes in and out of the system. Temperature is the measure of heat. For example during the phase change of water, it can gain heat but remain at a constant temperature. Here a video that may help https://www.youtube.com/watch?v=ZVhJ4TO8a-M

BoparaiAdeshsurjit2F

The equation sheet is located on the class website. I believe another student has already linked it

BoparaiAdeshsurjit2F

It gets posted at 11 AM PST. It used to be 10 AM PST last quarter since his first lecture was at 10 Am but now it is at 11:00

BoparaiAdeshsurjit2F

Yes you can use the ICE table to find partial pressures and molar concentration and also can be used to calculate the total pressure in the system

BoparaiAdeshsurjit2F

One major tip for the exams to join really early so you can get your paper checked before the exam with your TA and do not have to be super stressed out

BoparaiAdeshsurjit2F

There is an updated constants sheets on the CHEM 14B website.

BoparaiAdeshsurjit2F

Dr Lavelle did post a lecture during veterans day but that was due to a midterm being that following week so he did not want his students to fall behind. However, we still have time before the midterm so we may have that day off.

BoparaiAdeshsurjit2F

Kw is the Ka value times the Kb Value

BoparaiAdeshsurjit2F

pH is a scale that represents the acidity based on the Hydrodium concentration where the lower pH means more acidic. The pOH value is based on the Hydroxide value which is like the pH scale but 1 is the most basic. They are conjugates of one another.

BoparaiAdeshsurjit2F

Does anyone know why the [OH-] is different from the pOH. Why is it a very small negative number? Thanks in advance! [OH-] is different from pOH because [OH-] is the molarity/concentration of OH- in the reaction where pOH is a scale used to measure the basicity. So the lower the pOH the higher the ...

BoparaiAdeshsurjit2F

Kc is for molarity
Kp is more atms/bars

BoparaiAdeshsurjit2F

It because the reaction is going back and forth from reactants to products which makes them reach equallibruim.

BoparaiAdeshsurjit2F

You might be able to have a free trial but Im not sure how it really works

BoparaiAdeshsurjit2F

Yes, the lecture format is the same as CHEM 14A. It is unrealistic for Dr. Lavelle to hold zoom lectures with more than 300 people in each lecture.

BoparaiAdeshsurjit2F

I hope they will be asynchronous, because I have a class conflicting with it. I did hear that he might have tests during this lecture time, but I'm not sure how that would work considering the amount of people taking this class. Exams will works just as our fall 2020 midterm worked as most of his s...

BoparaiAdeshsurjit2F

You go through "register alias and password" it lets you change your username.

BoparaiAdeshsurjit2F

A rightward shift is one that favors products where a leftward shift is for reactants

BoparaiAdeshsurjit2F

No he said that was CHEM 14B thing

BoparaiAdeshsurjit2F

Since there is oxygen present the acidity is now based on what has the highest electronegativity. There are way too many rules for acids and bases lol

BoparaiAdeshsurjit2F

Yea CCLE has been really unreliable this week.

BoparaiAdeshsurjit2F

Basically, everything in the fat bracket is complex and every together is the compounds

BoparaiAdeshsurjit2F

Yes one bond is a sigma bond and two bonds is one sigma bond and one pi bond but still called a Pi bond.

BoparaiAdeshsurjit2F

There is no relationship between frequency and amplitude since you could have a small amplitude but still a high frequency. i think you talking about energy. If increase frequency it leads to an increase in energy as shown by the photoelectric effect.

BoparaiAdeshsurjit2F

Like said above, the wedge means it towards you and the dash is away from you

BoparaiAdeshsurjit2F

They are both correct but I use O2H because O is the coordinate covalently bonded.

BoparaiAdeshsurjit2F

I believe that it will about the same.

BoparaiAdeshsurjit2F

Yes the final will be multiple choice with each question worth 6 points each.

BoparaiAdeshsurjit2F

I think you just need 50 points at the end of quarter

BoparaiAdeshsurjit2F

I believe it is on Sunday, December 13th from 11:30 AM to 1 PM.

BoparaiAdeshsurjit2F

You have to go to your TA's office hours to see what you got wrong

BoparaiAdeshsurjit2F

Does anybody know the grading scheme. If 50% is needed to pass how much do you need to get an A?

BoparaiAdeshsurjit2F

CHEM 14B lectures will be asynchronous but we will have exams during lectures so it is not recommended to overlap classes.

BoparaiAdeshsurjit2F

I have heard that Dr. Lavelle usually adjusts grades based on the average after the final. Will that happen this year. Approximately how much is the shift. At the moment I could only miss 19 points to keep an A so I am hoping for a larger cushion.

BoparaiAdeshsurjit2F

So I have heard that you need 50% (250/500) to get a C- in the class, but how does that affect the rest of the grades. Like do you need to get 465/500 in order to get an A or is lower? This has been brought up a lot but I still do not have an answer. Could someone please let me know?

BoparaiAdeshsurjit2F

I heard that Midterm 2 scores were supposed to come out today. Does anybody have any updates about this?

BoparaiAdeshsurjit2F

I think the only reason we had a lecture on Veteran's Day was to give everyone at least a week before the midterm because if the lecture was skipped then Outline 3 would end on Friday giving Tuesday testers only 3 days to prep where they would have 5 days in advance to study. However, we do not have...

BoparaiAdeshsurjit2F

Nope you can take it after

BoparaiAdeshsurjit2F

Yes I heard Dr Lavelle will be increasing spots.

BoparaiAdeshsurjit2F

Chem_Mod wrote:Possibly.

Let's see if no unexpected events occur (power outages, fires, etc.).

Hello Dr Lavelle,
Are you saying at the end of today or later next week?

BoparaiAdeshsurjit2F

I read on the syllabus that you need to get at least 50% of the points in order to get a C-. How much do I need to get an A then?

BoparaiAdeshsurjit2F

What type of question will be on the midterm? Will it be more conceptual than let's saying writing electron configuration or drawing lewis structures and defining formal charges? Or will it be a balanced mix of both?

BoparaiAdeshsurjit2F

I do not but could I please get a copy of that please

BoparaiAdeshsurjit2F

Was initially worried about this also but I think they will not make them that tricky.

BoparaiAdeshsurjit2F

We go by increasing quantum number so it would be 3d 4s

BoparaiAdeshsurjit2F

You could follow the electronegativity trend on the periodic table and see the CL is more electronegative than I which means that it has a stronger pulling on the Hydrogen's electrons meaning it is more likely to completely pull out the electron of the hydrogen making it more ionic in character.

BoparaiAdeshsurjit2F

What will be the last lecture that covers material for midterm 2? Is it this Wednesday or Friday?

BoparaiAdeshsurjit2F

Which section of the textbook are we responsible to know for the second midterm. Is it from Quantum Numbers to section 2d?

BoparaiAdeshsurjit2F

I have heard that chem 14b has a similar structure to chem 14a but will the lecture also be asynchronous on Bruincast or will they be live. Just planning out my classes and trying to figure out what times are better for me and if I could stack a class on chem 14b if it is asynchronous.

BoparaiAdeshsurjit2F

Will Chem 14B also have asynchronous lectures?

BoparaiAdeshsurjit2F

Yea I think that any of the tests are not curved but on the Syllabus it says that you only need 250/500 points to have C- in the class so the straight scale for our letter grades may not be the traditional grading scale.

BoparaiAdeshsurjit2F

Please let me know.

BoparaiAdeshsurjit2F

Just read the textbook it helps the most.

BoparaiAdeshsurjit2F

When are midterm scores coming out?

BoparaiAdeshsurjit2F

When will scores be released?

BoparaiAdeshsurjit2F

If I post 7 posts one week and only 3 the other week will I get full points like is there carry over for the weeks?

BoparaiAdeshsurjit2F

I asked my TA about it and he explained that they will be released sometime this coming week. There some errors in the tests on a couple of versions and they want to fix it.

BoparaiAdeshsurjit2F

Yea this will be on the exam

BoparaiAdeshsurjit2F

Nope, we dont have to worry about it

BoparaiAdeshsurjit2F

Audiovisuals,Textbook Problems, and Sapling. Also reading the textbook

BoparaiAdeshsurjit2F

I don't think you could use those for the same objective. The photoelectric effect is used for finding energy of light, which does not have a rest mass. The de Broglie's, however, is used for electrons and other particles with a rest mass. Therefore, I don't think you would get the same answer, nor...

BoparaiAdeshsurjit2F

SainehaMaddineni_2D wrote:As per Lavelle's email, it should be until 1D.2 in the textbook, but the problems in section 1D don't seem to apply to what we expect to be on the midterm.

Yea that's what I was confused about.

BoparaiAdeshsurjit2F

Could you find the wavelength of an object using the photoelectric effect and De Broglie Equation and it will give you the same thing?

BoparaiAdeshsurjit2F

Do we have to do any part of section D?

BoparaiAdeshsurjit2F

Please let me know. Thank you

BoparaiAdeshsurjit2F

Will the empirical equation that Dr. Lavelle used in the lecture on Friday be able to solve the same problems that the Rydberg equation can?

BoparaiAdeshsurjit2F

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

BoparaiAdeshsurjit2F

How do you guys study for chem 14a? With the midterm coming up for this what are the best ways to prepare?

BoparaiAdeshsurjit2F

in the Rydberg equation is the n^2 in the denominator always the initial energy level?

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