CHEMISTRY COMMUNITY

shouse1f

I believe the newer material will be more emphasized

shouse1f

Thanks!

shouse1f

I know Lavelle mentioned the steady state approach but only went over the pre-equilibrium, so is the pre-equilibrium approach the only one we are expected to know?

shouse1f

I haven't heard of anything of what he is calling it this time but his review session I believe is on Saturday

shouse1f

I believe there will be 8 questions with some having multiple parts similar to how the midterm was.

shouse1f

Whatever is on the syllabus can be tested and Lavelle did finish the syllabus today in class so I believe Friday's lecture will be used for review

shouse1f

I don't think he has posted anything yet but his review session is Saturday I believe so hopefully soon.

shouse1f

I believe that typically sig figs do matter on an exam and will be graded, so I would say to be safe always try to have the correct sig figs written.

shouse1f

LorenzoDuvergne3I wrote:What else was discussed today? I unfortunately couldn't make it because I was feeling ill.

The pre-equilibrium approach and the relationship between temperature and reaction rate and activation energy and reaction rate

shouse1f

there is no curve for the class but in the syllabus, I believe it says there is a 50% required for a C- and I think he has mentioned before that after the finals grades are in he may make adjustments to the grading scale if he sees fit.

shouse1f

today in lecture it was said that you can never have an intermediate in a rate law

shouse1f

k is the rate constant and K is the equilibrium constant

shouse1f

in lecture today it was explained that frequency factor, A, has to do with reactants must have correct orientation when they collide. Dr. Lavelle also mentioned when A increases k decreases

shouse1f

from what was said in lecture frequency factor has to do with reactants having the correct orientation when they collide

shouse1f

Microscopic reversibility is where one assumes that the reaction has the same pathway in the forward and reverse direction

shouse1f

In the syllabus, it says that 50% is required to get a C-, and a C- is passing and is what is required to move on to the next course in the series.

shouse1f

Thank you, that makes sense

shouse1f

could someone explain how you go about solving for the unique rate using the equation I was a bit confused with how the solutions manual showed how to for this same homework question

shouse1f

On test 2 there was a question regarding if delta G was greater than, equal to or less than zero for the photosynthesis of glucose, could someone explain why the answer was that delta G <0

shouse1f

you should get it back in your discussion section this week

shouse1f

On test 2 for another part of the same question it asked which 2 species would give the largest E cell, how do you determine this?

shouse1f

test 2 covers Gibb's free energy and electrochemistry excluding the Nernst equation and I believe there is a post on the class website about the topics as well.

shouse1f

Everything that has been covered until Gibb's free energy can be tested, Gibb's free energy will not be included

shouse1f

I think any topic is fair game for homework like you can do previous topic practice problems for week 6 and week 7 and probably whatever is covered Friday

shouse1f

Last quarter solutions weren't offered so I would assume its the same this time as well

shouse1f

Neil Hsu 2A wrote:Last quarter in 14A, TA/UA Lyndon always had a midterm review/practice midterm with a funky name. Does anyone know if there is one this midterm; if so, what is it called. Thanks!

I think its called Hotdog this time

shouse1f

Lavelle said in lecture that everything up until before Gibb's free energy which was covered on Friday will be on the midterm

shouse1f

Jchellis 1I wrote:We only have two tests this quarter for 14B though, right? Wasn't it changed?

I believe we only have the 2 tests in discussion this quarter for 14B

shouse1f

I believe in addition to the review sessions offered outside class the lectures this week before the midterm will also be review

shouse1f

Shuyi Yu 1B wrote:When do we use concentration to find the equilibrium constant and when do we use partial pressure to find equilibrium constant? Will the question ask for one of the two specifically?

the question should normally specify which you should use

shouse1f

Louis Zhao 4C wrote:Is the test format multiple choice, free response or a mixture of both?

I believe the test will be all free response that is how the tests in discussion were formatted for 14a

shouse1f

I believe most equilibrium expressions are at 25 C if not stated otherwise

shouse1f

I think it would definitely be beneficial to memorize the common strong acid and bases.

shouse1f

amogha_koka3I wrote:So regardless of the molecule being ionic or covalent, it has LDF?

yes all molecules have LDF present

shouse1f

LDF are always present in all molecules

shouse1f

stronger intermolecular forces mean a high boiling point so whichever molecule has stronger forces, which in this case is NH3, will have a high boiling point.

shouse1f

something that is amphoteric has both basic and acidic character, which means it can accept an e- pair or donate one. Water is a common amphoteric substance

shouse1f

amphoteric: can act as either a base or an acid
amphiprotic: can donate or accept a proton

shouse1f

Saima Salam 3J wrote:I also had a question about the final. Does anyone know how many questions would be on the final? Would it be similar to the midterm (8 questions)?

Lavelle said the final would be 8 questions, and I think it will be fairly similar to the midterm in that each question could have several parts to it.

shouse1f

I believe that we can still be tested on them since they were covered in lecture

shouse1f

Brianna Brockman 3C wrote:All the stuff prior to the most recent test last week... can we assume that if it hasn't been tested in the tests or midterm that it won't be on the final? Or is literally everything fair game?

anything from the syllabus can be on the final

shouse1f

Jchellis 1I wrote:Is this worth points?

I don't believe it is worth any points

shouse1f

A bronsted acid is a proton donor and a bronsted base is a proton acceptor. A lewis acid is an electron acceptor and a lewis base is a electron donor.

shouse1f

I'm not sure but it would probably be good to know the common ones like acetic acid and it wouldn't hurt to learn other ones as well.

shouse1f

A lewis acid is an electron acceptor and a bronsted acid is a proton donor.
A lewis base is an electron donor and a bronsted base is a proton acceptor.

shouse1f

yes regions of electron density around the central atom equal the number of hybrid orbitals.

shouse1f

yes I believe hybridization will be on test 3

shouse1f

what is the significance of sigma/pi bonds?

shouse1f

are lone pairs and bonding pairs both considered regions of electron density?

shouse1f

how do lone pairs affect the shape and repulsion in a molecule

shouse1f

I believe we have to memorize them, but I think doing more practice problems will help to become more familiar with them.

shouse1f

are electron affinity and electronegativity related?

shouse1f

the formal charge being zero means that that is most stable structure for the molecule

shouse1f

the formula for formal charge is FC= valence - (lone pairs + (shared/2))

shouse1f

only the topics covered up to friday's lecture will be on test 2

shouse1f

is spin related to a specifc quantum number?

shouse1f

n determines energy and shell size and the other quantum numbers l and ml determine shape and orientation.

shouse1f

h is Planck's constant, which is 6.63*10^-34 J*seconds and I believe it will be given on the formula sheet for tests.

shouse1f

Will the value of c normally be given for use of the equation E=hc/ƛ?

shouse1f

since I think the value is usually given I would use whichever they give.

shouse1f

I typically use the exact number written on the table and wait to round anything until the very end.

shouse1f

does anyone have any recommendations on resources to use to brush up on units and unit conversions?

shouse1f

is pm a commonly used unit?

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