Search found 10 matches
- Sat Mar 18, 2017 9:25 pm
- Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
- Topic: 2014 Midterm Q7 E & F
- Replies: 1
- Views: 1243
2014 Midterm Q7 E & F
7E says: The molecule 3-chloro-4,4,4-trihydroxy-3-methylbutanenitrile was produced. Draw the lowest energy Newman diagram for this molecule looking down the C2-C3 bond axis. and 7F is almost the same but asks about the second lowest energy conformation. Can someone explain why the lowest energy diag...
- Sat Mar 18, 2017 7:30 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Change in Entropy Formula
- Replies: 1
- Views: 581
Change in Entropy Formula
I know that the formula \Delta S=nCln\frac{T_{2}}{T_{1}} is given to us on the formula sheet, but would the formula \Delta S=nRln\frac{V_{2}}{V_{1}} also be given to us? Or is this something we need to know/memorize? I'm not sure if I just don't see it on our "Constants and Equations Used in Ch...
- Sun Mar 12, 2017 10:21 pm
- Forum: *Ethers
- Topic: Ether Naming
- Replies: 1
- Views: 1330
Ether Naming
On page 100 of the course reader, we are given the example of: CH3CH2CHCH2CH2OCH2CH3 .............. | .............. CH3 and the resulting name is 1-ethoxy-3-methylpentane. I remember in class, Dr. Lavelle mentioned that you pick the longest continuous C-C chain because that usually also has the sub...
- Sun Mar 05, 2017 9:18 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3941873
Re: Post All Chemistry Jokes Here
honestly I laughed
- Sun Feb 26, 2017 7:35 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3941873
Re: Post All Chemistry Jokes Here
I love puns
- Sun Feb 19, 2017 10:50 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3941873
Re: Post All Chemistry Jokes Here
I'm the pessimist
- Sun Feb 12, 2017 7:56 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidation Numbers
- Replies: 1
- Views: 410
Oxidation Numbers
Can someone explain the rules for oxidation numbers/states a little bit more for me? For example, in the course reader we saw MnO_{4}^{-} , and we figure out that the total charge is -1, one O_{4} charge is -2, and the total O_{4} charge is -8 and because of these things the charge for Mn is +7. Wha...
- Sun Feb 05, 2017 6:17 pm
- Forum: Balancing Redox Reactions
- Topic: Homework Problem 14.17
- Replies: 3
- Views: 1955
Re: Homework Problem 14.17
Hi! For a) The cathode half-reaction would be: MnO^{-}_{4}(aq)+ 8H^{+} (aq) + 5e^{-} \rightarrow Mn^{2+}(aq)+ 4H_{2}O (l) and the anode half-reaction would be: 5Fe^{2+} (aq) \rightarrow 5Fe^{3+} (aq)+ 5e^{-} (you can factor out the 5) Adding these two ...
- Sun Jan 29, 2017 5:53 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Confusion about K and Q and Equilibrium
- Replies: 1
- Views: 463
Re: Confusion about K and Q and Equilibrium
The course reader actually says: 1. ΔG° = -RT ln (K) 2. ΔG = ΔG° + RT ln (Q) The first equation is ΔG°, not ΔG. This makes sense because in the first equation, the system is at equilibrium, so ΔG = 0. Maybe this will help it make more sense: ΔG = ΔG° + RT ln (K) 0 = ΔG° + RT ln (K) - ΔG° = RT ln (K)...
- Sun Jan 15, 2017 4:07 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Standard Enthalpy of Formation Clarification
- Replies: 1
- Views: 413
Standard Enthalpy of Formation Clarification
I understand that to find reaction enthalpies using Hess's law or bond enthalpies, the problem you are trying to solve must give you certain information or else you can't use those methods. However, since for standard enthalpy of formation you are just looking at a table to find your information, ca...