CHEMISTRY COMMUNITY

Olivia_Chen_3E

Dr. Lavelle,

Thank you so much for putting so much enthusiasm into your lectures and allowing us to push through the quarter. You showed me how passionate someone can be about chemistry that they are willing to teach the same lecture three times a day without seeming bored or tired.

Olivia_Chen_3E

Will phenols be on the final?

Olivia_Chen_3E

In 4.8 of the organic chemistry textbook, it asks to draw two lewis structures for SCN-. In the solutions, the negative sign for the two different lewis structures is on either the S or the N molecule, and I was wondering why this was, and if it had anything to do with thiocyanate being an ambident ...

Olivia_Chen_3E

Yes, even though there is a ' mark after the k, it doesn't have anything to do with differentiating the rate constant k, it's just do indicate that it is the rate constant of the reverse reaction, which only occurs for fast reactions, and for slow reactions, k' can be disregarded, as the reaction is...

Olivia_Chen_3E

For calculating the number of moles, I think you have to balance the half reactions in order to find out the number of electrons transferred during the reaction, which is the number of moles that you use to find Gibbs free energy.

Olivia_Chen_3E

In the homework for 14.1, the answer in the back of the book for part (b) the reduction half reaction, involves 14H-. I was just wondering what exactly does H- mean and for the final addition of the two half reactions for part (d) how this cancels with the oxidation reaction to give us 8H+.

Olivia_Chen_3E

I was also wondering, why when you attempt to convert L atm to J why it gives you a slightly different result when you don't use that conversion rate and instead use dimensional analysis multiple times.

Olivia_Chen_3E

Problem states: The following data were collected for a new compound used in cosmetics: Hfus 10.0 kJ·mol 1, Hvap 20.0 kJ·mol 1; heat capacities: 30 J·mol 1 for the solid; 60 J·mol 1 for the liquid; 30 J·mol 1 for the gas. Which heating curve below best matches the data for this compound? I was wonde...

Olivia_Chen_3E

In my discussion section last week, we discussed how to solve for reaction enthalpies using Hess's Law, bond enthalpies and standard enthalpies of formation, and we did a practice problem where we had to calculate reaction enthalpy of a reaction at 100º C instead of 25º C using the standard enthalpy...

Olivia_Chen_3E

Are specific heat capacity and specific heat the same thing? I wasn't sure if they were used interchangeably in the homework problems, but I have been treating them as if they were.

Olivia_Chen_3E

is h3o related to oh-

Olivia_Chen_3E

I was wondering if there was any difference in the method for calculating K using pressure vs. concentrations.

Olivia_Chen_3E

So when there isn't a di, tri, etc, you don't need to use bis?

Olivia_Chen_3E

I think maybe the pattern they are referring to is how the 3d orbitals get filled up before the 4s after atomic number 20, even though according to the pattern, 3d is after 4s. But they're filled up because they're lower energy, so it makes sense that the lowest energy level orbitals get filled up f...

Olivia_Chen_3E

Yeah the dots just represent the electrons.

Olivia_Chen_3E

I think some elements can have more than 8 electrons. I know that sulfur and phosphorus sometimes have expanded octets but there might be more that I don't know about.

Olivia_Chen_3E

Also, if you look up a chart with the different wavelengths of light, it will help you figure out what activity the college student is doing, for example, when the wavelength is 340nm, that's in the UV range, so we can assume that he's getting a sun tan.

Olivia_Chen_3E

When doing the homework problems, I googled the Rydberg constant to double check it, but the result I got was 10973731.6 m-1, which was completely different from the value that is in our course reader, and I was wondering why they were different.

CHEMISTRY COMMUNITY

Search found 18 matches

Re: Saying Thank You to Dr. Lavelle

Re: Extra Review Session Winter 2017

Thiocyanate Lewis Structure [ENDORSED]

Re: k'

Re: 14.23

HW 14.1

Re: Problem 8.9

Problem 8.43

Different ways to calculate reaction enthalpies

Specific Heat Capacity

is h3o related to oh-

difference between k in pressure and k in concentration

Re: Bis- prefix [ENDORSED]

Re: Quantum Numbrrs

Re: Base Notation [ENDORSED]

Re: The Octet

Re: Hmwk Problem 1.9 [ENDORSED]

Rydberg Constant [ENDORSED]