CHEMISTRY COMMUNITY

Mishta Stanislaus 1H

I believe those four are the answers.

Mishta Stanislaus 1H

a catalyst is present before a reaction takes place, as opposed to an intermediate that is present after the reaction takes place.

Mishta Stanislaus 1H

Dear Dr. Lavelle, Thank you so much of your dedication to teaching. I really came into this class without a strong chemistry background but I rarely felt like that out me at a disadvantage. These past two quarters have really made be appreciate chemistry and all of its real world applications. Thank...

Mishta Stanislaus 1H

"A nucleophile is a chemical species that donates an electron pair to an electrophile to form a chemical bond in relation to a reaction"

Mishta Stanislaus 1H

yes this is correct

Mishta Stanislaus 1H

Can you expand? We did have to draw a lewis structure is thats what you're talking about.

Mishta Stanislaus 1H

Because the external pressure was constant the process was irreversible, and that equation is for reversible processes.

Mishta Stanislaus 1H

Jacquelyn Hill 1 wrote:Also, is the size a more significant factor in determining this than the state that the molecule is in?

I have this same question.

Mishta Stanislaus 1H

What exactly is the relationship between k and activation energy?

Mishta Stanislaus 1H

Yes this could potentially and most likely will be on the test.

Mishta Stanislaus 1H

Just conceptual knowledge, not calculations.

Mishta Stanislaus 1H

Bryan Vega 2E wrote:Unless the question specifically asks you to state your answer in a particular unit, it does not matter what units you choose to use.

So essentially you choose?

Mishta Stanislaus 1H

Julianna Thrasher 1B wrote:I like Crash Course by John Green! Very basic review just to remind you of topics in the chapter. https://www.youtube.com/watch?v=7qOFtL3VEBc

I found this video to be a helpful overview!

Mishta Stanislaus 1H

And all lecture material up to last Friday

Mishta Stanislaus 1H

Mishta Stanislaus 1H wrote:In a UA session we were told that he would provide a long list of half reactions and we would just have to choose from the list which are useful per problem.

With the standard reduction potentials given as well

Mishta Stanislaus 1H

In a UA session we were told that he would provide a long list of half reactions and we would just have to choose from the list which are useful per problem.

Mishta Stanislaus 1H

I was told by a UA that he provides a long list of half reactions and we just have to find with ones we need for the specific problem from the list

Mishta Stanislaus 1H

The correct answer given during the review session was 16 degrees Celsius.

Mishta Stanislaus 1H

The equations also differ
reversible work, W=-nRTln(v2/v1)
irreversible work, W= -Pext (v2-v1)

Mishta Stanislaus 1H

Hi! I've been struggling with the same question but in the review session we were told that unless the problem specifically says that pressure is constant we use Cv.

Mishta Stanislaus 1H

In friday's lecture (and other prior unrelated lectures), Dr. Lavelle set two gibbs free energy equations equal to each other. Can we assume that we can set any of these equations for gibbs free energy equal to each other? (not standard gibbs free energy because that's not the same as just gibbs fr...

Mishta Stanislaus 1H

I don’t think this will be required for us to know

Mishta Stanislaus 1H

Des delta G and delta S have to equal zero for a reaction to be reversible? Can someone explain the reason?

Mishta Stanislaus 1H

This discussion helped me understand degeneracy a lot better,
viewtopic.php?t=9912

Mishta Stanislaus 1H

This discussion helped be understand the distinction much better, hope it helps!
viewtopic.php?t=9912

Mishta Stanislaus 1H

Natalie LeRaybaud 1G wrote:After going through the homework I noticed numbers 3-13,25-31, and 47-49 all have to do with calculating work or internal energy. I would suggest studying all the other homework problems specifically for this upcoming test.

Can anyone else confirm that these problems aren't going to be tested on?

Mishta Stanislaus 1H

Miranda 1J wrote:For the test do we need to know how to derive the work equation? I know Dr. Lavelle said work and DU won't be on the test but this seems like a conceptual thing to me so I'm not entirely sure.

I have this same question

Mishta Stanislaus 1H

Do we need to know about the specific enthalpy?

Mishta Stanislaus 1H

On the test will the enthalpy of formation values be provided in the problem or do we have to memorize?

Mishta Stanislaus 1H

I usually think about the prefixes. The "en" in endothermic sounds like in and the "ex" in exothermic reminds me of exit.

Mishta Stanislaus 1H

During a phase change, say from solid to liquid, why does the temperature remain constant and not increase?

Mishta Stanislaus 1H

elliekauffman1I wrote:Why is Kw=x^2? Doesn't that imply that H3O and OH are the same value? And if so, then how are we supposed to know that?

I also need help with this question

Mishta Stanislaus 1H

Rank the following solutions in order of increasing pH: (a) 1.0 10 5 m HCl(aq); (b) 0.20 m CH3NH3Cl(aq); (c) 0.20 m CH3COOH(aq); (d) 0.20 m C6H5NH2(aq). Justify your ranking. For this problem would be expected to know the answer without a specific K or Kb value, because the solution manual doesn’t u...

Mishta Stanislaus 1H

Could someone please expand on this answer?

Mishta Stanislaus 1H

I️ think the best way to approach the textbook is by using the lecture notes as a sort of outline for the book. That way you can focus on the relevant informations as delivered in class. This method weeds out some of the overly complex detail in the textbook. Hope that helps!

Mishta Stanislaus 1H

What is the best way to determine where the radical will be placed?

Mishta Stanislaus 1H

We can determine the bond length by seeing how many electrons are being shared. The higher the bond order, the stronger the pull between the atoms and the shorter the length of the bond. Hope that helps!

Mishta Stanislaus 1H

Hello, just to clear up any confusion I believe the answer above is the correct one, Zinc, as opposed to the previous answer because the 3d orbital is listed first but the 4s must be filled first.

Mishta Stanislaus 1H

Just a reiteration, but yes you could switch those variables. They serve the purpose of showing the orbital is three dimensional.

Mishta Stanislaus 1H

The purpose was to be able to find the m,l,etc, values I believe .

Mishta Stanislaus 1H

I'm curious about this as well, will we be penalized for doing it a different way as him?

Mishta Stanislaus 1H

I understand the second half of the explanation, just not the first concerning the division of one by the number of wavelengths.

Mishta Stanislaus 1H

To answer this question you must convert the given work function from kJ to J. Then you must divide by avagadro's number to find the energy required per atom as opposed to per mole.

Mishta Stanislaus 1H

I understand that wave length and frequency have and inverse relationship due to the given equation, but does amplitude relate to these in any way?

Mishta Stanislaus 1H

I had the same question, thanks for clarifying!

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