CHEMISTRY COMMUNITY

Matt Sanruk 2H

Yeah since they are so rare, they will most likely not occur and will most likely not show up on any problems

Matt Sanruk 2H

It should either be stated as the slow step, or it has the exact same rate as the overall equation

Matt Sanruk 2H

Also I believe the UA's would have to buy a certain feature on zoom in order to have a session be longer since its restricted for students.

Matt Sanruk 2H

The multiple posts are the ones that are really getting me, but at least its easier since one page of posts has 25 posts listed.

Matt Sanruk 2H

Do you know if it also applies to TA review sessions and office hours too?

Matt Sanruk 2H

Yeah it will probably be online but we'll see how he does this since its chemistry.

Matt Sanruk 2H

Since its the slowest step, this step is going to be the one that is the most prominent in determining the overall rate since the rate is at this slow rate most of the time.

Matt Sanruk 2H

Ah I see that would make things a lot more convenient

Matt Sanruk 2H

But a solvent is different right?

Matt Sanruk 2H

Yeah it would be nice to have a take home but a take home would also be so much harder since there is no time limit technically

Matt Sanruk 2H

As of right now the final will not be take home, but taken on the designated location this Sunday?

Matt Sanruk 2H

Naren_Ramesh_4F wrote:Will there be any curve or anything of that nature on this Test?

There probably will not, since the tests are more meant for a buffer since it is relatively "easier" compared to the midterm and final.

Matt Sanruk 2H

Oh I see this equation would make this a lot easier to solve. Thanks!

Matt Sanruk 2H

How did you guys approach this problem and how can you get the pH from voltage and vice versa?

Matt Sanruk 2H

And this is also the case since you do not consider solids for equilibrium?

Matt Sanruk 2H

A comma is used when they are in the same phase (e.g. aqueous for ions) and | is used to separate those in different states such as: Ni(s)|Ni^2+(aq)

Matt Sanruk 2H

Since it is not present in the slowest step we can assume that it is indeed zero order and does not affect the rate

Matt Sanruk 2H

Maya Beal Dis 1D wrote:If you are using the shortcut E=E(naught)-(0.05916/n)logQ, you need to use log. I think there is another number shortcut if you are using the equation with natural log.

Is this the equation given on the equation sheet?

Matt Sanruk 2H

I'm pretty sure we will get it back next week for our last discussion

Matt Sanruk 2H

Oh ok, so under these conditions they are basically equal to each other. Thanks!

Matt Sanruk 2H

And this is going to be on week 9, right?

Matt Sanruk 2H

Lavelle also curves the total grade at the end, not for the tests itself and it is usually pretty generous. Also I dont think the range is percent out of 500 since 250 is a c minus I believe

Matt Sanruk 2H

MTanikella_1K wrote:5 posts are due every Sunday and the easiest way to keep track of the number of posts is to subtract your total from 50!

It's pretty difficult since I got more than 50 posts last quarter too.

Matt Sanruk 2H

Ashley Fang 2G wrote:Yes, work (max) equals delta G under constant temperature and pressure.

What is the exact formula?

Matt Sanruk 2H

Yeah it depends on your TA I believe. Mine said that he would do regrades during his office hours, not his discussion, so I'm sure they can still do regrades. I would still ask in case you are too late

Matt Sanruk 2H

Oh this is the one similar to the delta g equation comparing the delta g at standard and delta g given?

Matt Sanruk 2H

EMurphy_2L wrote:anode is left and cathode is right unless otherwise stated !

Ok, so he would not try and trick us in that way basically?

Matt Sanruk 2H

Alice Ma 2K wrote:The anode is always the one that is oxidized and the cathode is reduced, so if you know which species are oxidized or reduced, you can differentiate between the anode and the cathode.

Would you know this by an equation given or the electron flow?

Matt Sanruk 2H

What is the Nernst equation exactly?

Matt Sanruk 2H

Is work and delta G related?

Matt Sanruk 2H

Would there be a condition where the anode is on the right?

Matt Sanruk 2H

Just remember that STP(273.15K) and standard state conditions (298.15K) are not the same.

Matt Sanruk 2H

If you were given a diagram of the electrochemical cell, should I assume that anode is on the left and the cathode is on the right?

Matt Sanruk 2H

Kishan Shah 2G wrote:Personally, you can go under "your posts" tab and check the date on which you posted. This is the most definite way to check if you have completed the required number of posts in the right time period.

I'm just sad since it does not give the post number when it gives the date ;(

Matt Sanruk 2H

So we would look at what would cancel out in order to get the answer we want for example L, atm, J

Matt Sanruk 2H

yeah they usually just use the total number of posts over the quarter I think

Matt Sanruk 2H

Its just a standard pressure (1 atm) and temperature (273.15 K) that is used for calculating gas properties like density. It's just another way of just giving the temperature and pressure of the system.

Matt Sanruk 2H

Sorry yes I meant temperature, thanks!

Matt Sanruk 2H

So this is for constant pressure and ideal gas?

Matt Sanruk 2H

What would be an example of delta U equaling to zero?

Matt Sanruk 2H

And this would be irreversible?

Matt Sanruk 2H

Where would m*C*delta T be in this situation?

Matt Sanruk 2H

Since it's at STP, the value must at the a value of 273.15k

Matt Sanruk 2H

Sorry I think I shouldn't use the term bond length, but rather bond number, but I do not know how to change it.

Matt Sanruk 2H

So .08206 is used for non energy related questions?

Matt Sanruk 2H

Hey can someone explain to me, or refer to in the book about the whole 1/2 kt for 1-D, 5/2 kt for linear, etc. I kind of understand but I also do not know where this is coming from, or do I memorize it?

Matt Sanruk 2H

But there will always be a problem where the %ionization is not under 5 % of course...

Matt Sanruk 2H

Basically the method with Delta H^0 is the one we want to use?

Matt Sanruk 2H

I think they are independent of each other, but I also do not know how the algorithm works so...

Matt Sanruk 2H

So just to make sure, but the bond enthalpy is reactants minus products while the last method is products minus reactants, right?

Matt Sanruk 2H

Oh so it would be treated as if you added products or reactants depending on the sign of delta H

Matt Sanruk 2H

I know this depends on the delta H, but what happens if the temperature is changed? For example: delta H is positive and temperature is increased, what would happen?

Matt Sanruk 2H

Do we get points off for not doing ICE boxes?

Matt Sanruk 2H

If only I thought ahead of time and wrote it down somewhere. Anyways, thanks!

Matt Sanruk 2H

If I calculate a pKb or a pKa and the answer is relatively low, does that mean I did the problem correctly? Or at least it's a good sign that its correct?

Matt Sanruk 2H

Sean Cheah 1E wrote:The Henderson-Hasselbalch equation states that $pH = pK_{a} + log(\frac{[A^{-}]}{[HA]})$ . Use an ICE table to determine the concentrations of the conjugate acid-base pair.

This equation looks like it is very useful! Thanks!

Matt Sanruk 2H

smurphy1D wrote:Is R a constant in every equation? Or does it differ depending on the chemical equation ?

yes I believe it is a constant but I do not know the number since it is in bar not atm

Matt Sanruk 2H

Cool, and even if the given concentration and ka/kb are both 10^-4 or lower it will still be the case right?

Matt Sanruk 2H

Ok, so at times there will be reactants and products given you base the changed signs on the equilibrium

Matt Sanruk 2H

So the only way is to count? There is no post reset count option or anything?

Matt Sanruk 2H

Last quarter when I took chem 14A it was a lot easier to keep track of, but since I have above 50 posts already it is difficult to count how many I have for each week! Is there a way to differentiate between quarters or will it be if I get 100 overall by the end?

Matt Sanruk 2H

For ICE box, would the given concentrations always be a negative change?

Matt Sanruk 2H

It is similar to the relationship between pOH and pH

Matt Sanruk 2H

Oh, I see this manipulation can come in handy whenever we are given these circumstances thanks.

Matt Sanruk 2H

Oh ok this makes it a lot easier than the quadratic equation

Matt Sanruk 2H

Wouldn't pKa give an integer thats less than 7?

Matt Sanruk 2H

So as long as the percent Ionization is less than 5%, we don't have to do the quadratic equation right?

Matt Sanruk 2H

So as long as we are given the Ka or Kb value, we can find the pH or pOH?

Matt Sanruk 2H

So the Q shows whether the reaction is forward or reverse when compared to K, right?

Matt Sanruk 2H

Ok I see, but there won't be any problems that give both concentration and pressure for different elements right?

Matt Sanruk 2H

What was the purpose of changing the equation to equal P or the concentration? Will this be further manipulated when we deal with equilibrium?

Matt Sanruk 2H

Is cisplatin a chelating ligand or is it a complex compound?

Matt Sanruk 2H

So it will pretty much always have one strong base or acid

Matt Sanruk 2H

Do you guys know any good problems that can help with early quantum such as quantum mechanics question that are good study material for the final?

Matt Sanruk 2H

Do you guys have any advice for naming compounds with very long formulas, and writing chemical formulas for long names?

Matt Sanruk 2H

but its IMF's are greater in the HF than the others due to higher electronegativity right?

Matt Sanruk 2H

What would we do in the situation that both the acid and base are both weak, neither is a strong ion, what would we do for that?

Matt Sanruk 2H

Does this depend on whether or not the ion is a strong conjugate acid/base?

Matt Sanruk 2H

Oh this is a lot more clear thanks

Matt Sanruk 2H

How does this differ to the lewis acid and base?

Matt Sanruk 2H

Wow thanks for the replies guys and the diagram really helps thanks!

Matt Sanruk 2H

clicking remember me when logging in

Matt Sanruk 2H

I believe that he never gave us any homework on the schrodinger equation

Matt Sanruk 2H

And O has two hydrogen bonding sites right?

Matt Sanruk 2H

Can someone help me out with what a lewis acid and base is?

Matt Sanruk 2H

Can someone help clarify the definition of what a bronsted acid and a base is?

Matt Sanruk 2H

so hydrogen bonding trumps all covalent bonds, but ionic trumps all covalent bonds

Matt Sanruk 2H

but ionic bonds are stronger than covalent bonds

Matt Sanruk 2H

I think this is done to keep the formal charge 0

Matt Sanruk 2H

No since that was taught after the sigma pi bond slides

Matt Sanruk 2H

Is there specific work that you would have to show for the dipole moments or just the arrows?

Matt Sanruk 2H

Would the dipole moments cancel out?

Matt Sanruk 2H

So all ionic compounds will have higher imf, boiling and freezing points than any covalent molecule, right?

Matt Sanruk 2H

and there would still be dipole moments and dispersion forces on the compound as well right?

Matt Sanruk 2H

Oh yeah I see. Theres a complicated 15 minute video on youtube with obscure numbers.

Matt Sanruk 2H

That's because you gotta convert it from kg to g

Matt Sanruk 2H

Honestly besides doing well on the final, I just gotta hope that curve at the end is really generous for the overall grade.

Matt Sanruk 2H

But they will affect the shape, right? It's just that he will cover that in a later discussion right?

Matt Sanruk 2H

I'm going to need to do well on those tests after that midterm!

Matt Sanruk 2H

Ah ok I remember learning something similar to this in high school and was described with AXE, right?

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