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.
Search found 18 matches
- Fri Mar 17, 2017 11:37 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 567486
- Fri Mar 17, 2017 11:35 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Extra Review Session Winter 2017
- Replies: 7
- Views: 2249
Re: Extra Review Session Winter 2017
Will phenols be on the final?
- Sat Mar 04, 2017 4:02 pm
- Forum: *Nucleophiles
- Topic: Thiocyanate Lewis Structure [ENDORSED]
- Replies: 3
- Views: 2360
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 ...
- Sun Feb 26, 2017 10:44 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: k'
- Replies: 4
- Views: 1093
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...
- Wed Feb 15, 2017 12:29 am
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: 14.23
- Replies: 2
- Views: 742
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.
- Sun Feb 12, 2017 5:47 pm
- Forum: Balancing Redox Reactions
- Topic: HW 14.1
- Replies: 1
- Views: 420
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+.
- 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: 800
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.
- Fri Jan 27, 2017 10:35 pm
- Forum: Phase Changes & Related Calculations
- Topic: Problem 8.43
- Replies: 1
- Views: 510
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...
- 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: 504
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...
- Sat Jan 14, 2017 6:22 pm
- Forum: Phase Changes & Related Calculations
- Topic: Specific Heat Capacity
- Replies: 1
- Views: 436
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.
- Fri Nov 25, 2016 2:45 pm
- Forum: Conjugate Acids & Bases
- Topic: is h3o related to oh-
- Replies: 2
- Views: 3940
is h3o related to oh-
is h3o related to oh-
- 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: 928
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.
- Wed Nov 09, 2016 10:51 pm
- Forum: Naming
- Topic: Bis- prefix [ENDORSED]
- Replies: 3
- Views: 1015
Re: Bis- prefix [ENDORSED]
So when there isn't a di, tri, etc, you don't need to use bis?
- Fri Oct 28, 2016 3:20 pm
- Forum: Hybridization
- Topic: Quantum Numbrrs
- Replies: 2
- Views: 573
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...
- Sat Oct 22, 2016 2:29 pm
- Forum: Ionic & Covalent Bonds
- Topic: Base Notation [ENDORSED]
- Replies: 2
- Views: 717
Re: Base Notation [ENDORSED]
Yeah the dots just represent the electrons.
- Fri Oct 14, 2016 6:11 pm
- Forum: Ionic & Covalent Bonds
- Topic: The Octet
- Replies: 3
- Views: 955
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.
- Fri Oct 07, 2016 1:09 am
- Forum: Properties of Light
- Topic: Hmwk Problem 1.9 [ENDORSED]
- Replies: 6
- Views: 1130
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.
- Sun Oct 02, 2016 12:22 pm
- Forum: Properties of Light
- Topic: Rydberg Constant [ENDORSED]
- Replies: 1
- Views: 755
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.