CHEMISTRY COMMUNITY

Jasmine Botello 2F

You add it when there is no solid on that side of the cell diagram. So if there is already a solid then you don't add it.

Jasmine Botello 2F

For this question does anyone know where they got the values from??

Jasmine Botello 2F

I think it is because they are both in the same state. But can someone please confirm this?

Jasmine Botello 2F

Here is the question

Jasmine Botello 2F

Are we always supposed to flip one of the half-reactions to give you the MOST positive E value?

Jasmine Botello 2F

For this question, I know how to calculate everything except n. Could someone please explain how they got n because it does not explain that part? Is it the half reactions? because those are not given either...

Jasmine Botello 2F

Is this topic going to be on the final?

Jasmine Botello 2F

how would you identify them?

Jasmine Botello 2F

Are there any homework problems in the textbook that talk about this because I feel like I need practice on this or is it more of a conceptual thing??

Jasmine Botello 2F

i'm a little confused.. how is [A] different from ln[A] or 1/[A]?

Jasmine Botello 2F

In my notes, I wrote down that for a zero order the rate does not depend on concentration.. is this correct or did I write down incorrect information??

Jasmine Botello 2F

I think my TA told me that it does not necessarily have to be concentration. As long as you keep it the same throughout the problem.

Jasmine Botello 2F

What’s a real life example of a second order reaction?

Jasmine Botello 2F

What’s the significant difference between differential and integrated and when do you use either of the equations?

Jasmine Botello 2F

Is zero order common or uncommon???

Jasmine Botello 2F

For this part of the question, it asks "What is the unique rate of the reaction" and I am not really sure what it is asking me to find..?

Jasmine Botello 2F

Yes because you want to make sure that the electrons cancel out when you write the final balanced redox reaction.

Jasmine Botello 2F

I think if they are in the same state then you can use commas. However, whenever there is a solid and another state involved, you have to put the line.

Jasmine Botello 2F

How can you tell if a metal will dissolve in a solution?

Jasmine Botello 2F

Ammar Amjad 1L wrote:Appendix 2B: Standard Potentials at 25 celsius

Thank you!!!!

Jasmine Botello 2F

Does anyone know where in the book we find these values??

Jasmine Botello 2F

For this question it tell you to find DG and i understand that you are supposed to use the equation DG=-nFE but i am not sure how the solutions manual got the value of n.. can someone help to explain that please. Thank you.

Jasmine Botello 2F

I have seen some NERNST equations with logQ and others with lnQ... is there a difference or is it just a change of constants when using one or the other?

Jasmine Botello 2F

when you separate the redox reaction into the half reactions, should the electrons be put in both half reactions?

Jasmine Botello 2F

The value for standard reduction potential will always be a given right?

Jasmine Botello 2F

I think it is because HBr has a coefficient of 2 in front of it.

Jasmine Botello 2F

I am very confused because I am doing problems in which some say constant volume = 5/2R and others say constant pressure is 5/2R. Isn't one of these supposed to be 3/2R??

Jasmine Botello 2F

I think it just depends on how the problem is worded. For example, for #13, it states that it is ideal behavior. For #19, it gives the "molar heat capacities at constant pressure" which is equivalent to Cp,m. For #43, it just states that it is at constant pressure, which is equivalent to C...

Jasmine Botello 2F

In Monday's lecture, Lavelle explained how the anode is the negative side and the cathode would be the positive side. However, in my biology class, when we were discussing gel electrophoresis, the anode was the positive side and the cathode was the negative side. Is there a difference between the tw...

Jasmine Botello 2F

We are usually given the equations on the formula sheet so knowing how to derive should not be required.

Jasmine Botello 2F

Try to see what the lowest sig figs are in the problem given if that makes sense.

Jasmine Botello 2F

This is probably from 14A but are both Q and K raised to their coefficients or is it just K?

Jasmine Botello 2F

So just to make sure, this means that q=0, meaning that only work is being done by or on the system? I feel like my resoning might be wrong.

Jasmine Botello 2F

When the temperature is constant and pressure and volume are both changing, this means that work is being done BY the system right? aka expansion? or am I missing something?

Jasmine Botello 2F

What determines whether q is reversible or irreversible??

Jasmine Botello 2F

I was not sure where to post this but does anyone know when we will be able to see our finals from last quarter???

Jasmine Botello 2F

I think it is because 0 degrees is the melting point and 100 degrees is the boiling point and those are like important states.

Jasmine Botello 2F

so if it was asking for the number of atoms would you use avogadro's number?

Jasmine Botello 2F

In today’s lecture, Lavelle was explaining about N being the number of particles that can occupy the states but I’m confused on the last example that he gave about the CO molecules and why he put N=4 instead of N=2

Thank you

Jasmine Botello 2F

If this is specific heat then i think specific heat is always given but im not sure

Jasmine Botello 2F

PdeltaV represents work. so the equation would be deltaU= q+w and w=-PdeltaV.

Jasmine Botello 2F

More complex molecules have higher specific/molar heat capacity because they have more atoms present

Jasmine Botello 2F

what are some general equations that we should know for like heat of fusion or heat of vaporization?

Jasmine Botello 2F

will we be given tables like 8.3 on tests or are we supposed to memorize specific important values?

Jasmine Botello 2F

so chapter 8 starts with thermodynamics and Lavelle is starting with thermochemistry, right?

Jasmine Botello 2F

are we gonna go over this topic at all since we didn't go over it last quarter?

Jasmine Botello 2F

So when K is small enough, then X can be negligible. Does this apply only to weak acids and bases or any type of reaction?

Jasmine Botello 2F

I think that as long as the temp stays the same throughout the problem then it should not cause any changes in the way that you do the problem.

Jasmine Botello 2F

Is this topic supposed to be in test 4? I do not remember ever talking about it in class but I have heard from other students that we are required to know this.

Thank You!

Jasmine Botello 2F

"Describe the structure of a molecule, cation, or anion in terms of hybrid orbitals and sigma and
pi bonds"

can someone please explain this to me?

Jasmine Botello 2F

Is it not possible there not to be a binding site when there is a double bond??

Jasmine Botello 2F

Is it necessary to memorize the charges of the ligands?

Jasmine Botello 2F

Yes, the arrow will always point to the most electronegative atom because the electrons are being pulled in that direction. To figure out whether a molecule is polar or non polar you need to figure out whether the dipole moments cancel. It is possible that the dipole moments will be in the same dir...

Jasmine Botello 2F

the arrow always points to the most electronegative right??
and when they point in the same direction it is polar?
and when they point in opposite directions its nonpolar?

Jasmine Botello 2F

So there is always one sigma bond and then all other bonds created after that are going to be pi bonds??

Jasmine Botello 2F

are we supposed to know about pi bonds for the midterm?? I do not remember going over them in class.

Jasmine Botello 2F

Is it necessary to know or memorize the electronegativity chart in the book? It is figure 3.12 in the book. Will we be asked questions that require these specific values? or should we just know the trend?

Thank You!

Jasmine Botello 2F

This follows the patterns of Copper. The reason is to make it more stable. When going to the next element, you would then fill the s subshell.

Jasmine Botello 2F

When it is asking for electron pairs it is always helpful to draw out the orbital diagram so that you have a visual representation of it. Remember Pauli's rule and Hund's rule.

Jasmine Botello 2F

Why does the ionization energy decrease down a group? And why does it increase across a period? I don't fully understand why.

Jasmine Botello 2F

Just remember that each l value corresponds to the orbitals.
l=0 corresponds to s
l=1 corresponds to p
l=2 corresponds to d
l=3 corresponds to f

Jasmine Botello 2F

Is it necessary to memorize the chart (1.9) in the book or is it just a reference?

Jasmine Botello 2F

Dr. Lavelle told our lecture that we did not have to worry about black bodies for this upcoming test.

Jasmine Botello 2F

what are the n-levels associated with series that are listed above??

Jasmine Botello 2F

So is it necessary to know or memorize this chart in the textbook for future tests?

Jasmine Botello 2F

For me, I look at each problem individually and I decide which element looks easiest to balance first and it usually works out. So I would just go on a problem to problem basis.

Jasmine Botello 2F

You do not include the catalyst in the equation because its only purpose is to speed up the process of the reaction.

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