Search found 18 matches

by Olivia_Chen_3E
Fri Mar 17, 2017 11:37 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 225
Views: 102131

Re: Saying Thank You to Dr. Lavelle

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.
by Olivia_Chen_3E
Fri Mar 17, 2017 11:35 pm
Forum: Administrative Questions and Class Announcements
Topic: Extra Review Session Winter 2017
Replies: 7
Views: 1509

Re: Extra Review Session Winter 2017

Will phenols be on the final?
by Olivia_Chen_3E
Sat Mar 04, 2017 4:02 pm
Forum: *Nucleophiles
Topic: Thiocyanate Lewis Structure [ENDORSED]
Replies: 3
Views: 1018

Thiocyanate Lewis Structure [ENDORSED]

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 ...
by Olivia_Chen_3E
Sun Feb 26, 2017 10:44 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: k'
Replies: 4
Views: 612

Re: k'

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...
by Olivia_Chen_3E
Wed Feb 15, 2017 12:29 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: 14.23
Replies: 2
Views: 420

Re: 14.23

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.
by Olivia_Chen_3E
Sun Feb 12, 2017 5:47 pm
Forum: Balancing Redox Reactions
Topic: HW 14.1
Replies: 1
Views: 203

HW 14.1

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+.
by Olivia_Chen_3E
Sun Feb 12, 2017 4:17 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Problem 8.9
Replies: 3
Views: 429

Re: Problem 8.9

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.
by Olivia_Chen_3E
Fri Jan 27, 2017 10:35 pm
Forum: Phase Changes & Related Calculations
Topic: Problem 8.43
Replies: 1
Views: 261

Problem 8.43

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...
by Olivia_Chen_3E
Sun Jan 22, 2017 5:37 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Different ways to calculate reaction enthalpies
Replies: 1
Views: 251

Different ways to calculate reaction enthalpies

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...
by Olivia_Chen_3E
Sat Jan 14, 2017 6:22 pm
Forum: Phase Changes & Related Calculations
Topic: Specific Heat Capacity
Replies: 1
Views: 227

Specific Heat Capacity

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.
by Olivia_Chen_3E
Fri Nov 25, 2016 2:45 pm
Forum: Conjugate Acids & Bases
Topic: is h3o related to oh-
Replies: 2
Views: 1712

is h3o related to oh-

is h3o related to oh-
by Olivia_Chen_3E
Sat Nov 19, 2016 1:40 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: difference between k in pressure and k in concentration
Replies: 4
Views: 400

difference between k in pressure and k in concentration

I was wondering if there was any difference in the method for calculating K using pressure vs. concentrations.
by Olivia_Chen_3E
Wed Nov 09, 2016 10:51 pm
Forum: Naming
Topic: Bis- prefix [ENDORSED]
Replies: 3
Views: 553

Re: Bis- prefix [ENDORSED]

So when there isn't a di, tri, etc, you don't need to use bis?
by Olivia_Chen_3E
Fri Oct 28, 2016 3:20 pm
Forum: Hybridization
Topic: Quantum Numbrrs
Replies: 2
Views: 259

Re: Quantum Numbrrs

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...
by Olivia_Chen_3E
Sat Oct 22, 2016 2:29 pm
Forum: Ionic & Covalent Bonds
Topic: Base Notation [ENDORSED]
Replies: 2
Views: 327

Re: Base Notation [ENDORSED]

Yeah the dots just represent the electrons.
by Olivia_Chen_3E
Fri Oct 14, 2016 6:11 pm
Forum: Ionic & Covalent Bonds
Topic: The Octet
Replies: 3
Views: 467

Re: The Octet

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.
by Olivia_Chen_3E
Fri Oct 07, 2016 1:09 am
Forum: Properties of Light
Topic: Hmwk Problem 1.9 [ENDORSED]
Replies: 6
Views: 554

Re: Hmwk Problem 1.9 [ENDORSED]

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.
by Olivia_Chen_3E
Sun Oct 02, 2016 12:22 pm
Forum: Properties of Light
Topic: Rydberg Constant [ENDORSED]
Replies: 1
Views: 407

Rydberg Constant [ENDORSED]

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.

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