## Search found 13 matches

Sat Mar 18, 2017 7:59 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 291
Views: 136528

### Re: Saying Thank You to Dr. Lavelle

Thank you Dr. Lavelle and Dr. Lavelle's amazing course reader. :^)
Sat Mar 18, 2017 7:55 pm
Forum: *Calculations Using ΔG° = -RT ln K
Topic: How are the questions using ΔG°=-RT ln k phrased?
Replies: 3
Views: 848

### How are the questions using ΔG°=-RT ln k phrased?

For the calculations comparing the ratio of two conformations using ΔG° = -RT ln K, is that going to be in the final?
If it is, how are the questions usually phrased?
Fri Mar 10, 2017 7:58 pm
Forum: *Cycloalkanes
Topic: Constitutional Isomers
Replies: 2
Views: 528

### Constitutional Isomers

Hi,
I still don't understand how to come up with constitutional isomers. For example, when they ask for the cycloalkane isomers of C8H16, how do I figure it out?
Tue Mar 07, 2017 11:34 pm
Forum: *Nucleophiles
Topic: Ambident
Replies: 2
Views: 713

### Re: Ambident

An ambident nucleophile is a molecule that has more than one nucleophilic site and has a negative charge delocalized by resonance. To identify the ambident structure, you would need to know which molecules have resonance structures. If you are not able to determine from the chemical equation which o...
Tue Mar 07, 2017 9:34 pm
Topic: Steric Contriubtion to Standard Enthalpies of Activation
Replies: 1
Views: 726

### Re: Steric Contriubtion to Standard Enthalpies of Activation

We learn that \Delta S^{\circ}^{\ddagger } values are often unfavorable, negative values because there is usually a decrease in entropy when reactants go into the transition state. Going into the transition state, there are specific orientation requirements for the reaction and these specifications ...
Thu Feb 23, 2017 3:16 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Rate Law
Replies: 2
Views: 420

### Re: Rate Law

Yes, to determine the rate determining step the slowest of the multiple steps is used to dictate the overall reaction rate. For a proposed mechanism to be valid, the following conditions MUST be satisfied (no exceptions): 1. The elementary steps sum to the overall reaction. 2. The rate law of the sl...
Thu Feb 23, 2017 2:48 pm
Forum: First Order Reactions
Topic: Deriving the 1st order reaction equation
Replies: 2
Views: 377

### Re: Deriving the 1st order reaction equation

Deriving the First Order Reaction Rate = k[A] Rate = -\frac{d[A]}{dt} \therefore -\frac{d[A]}{dt} = k[A]^{1} \frac{d[A]}{dt} = -k[A]^{1} \frac{d[A]}{[A]} = -kdt \frac{1}{[A]}d[A] = -kdt \int_{[A]_{0}}^{[A]_{t}} \frac{1}{[A]} d[A] = - \int_{0}^{t} kdt \int_{[A]_{0}}^{[A]_{t}} \frac{1}{[A]} d[A] = -k...
Fri Feb 10, 2017 5:16 pm
Forum: Balancing Redox Reactions
Topic: Self Test 14.2 B
Replies: 2
Views: 386

### Re: Self Test 14.2 B

The equation for the reaction of iodide with iodate should be:

$IO_{3}^{-} + 5I^- + 6H^+ \rightarrow 3I_{2} + 3H_{2}O$

Does that make it easier to figure out the oxidation/reduction part?
Fri Feb 10, 2017 5:06 pm
Forum: Balancing Redox Reactions
Topic: Homework 14.15 (a)
Replies: 1
Views: 322

### Re: Homework 14.15 (a)

If you look in the back of the book at Appendix 2B, you can find the half reactions (remember that these are reduction half reactions, though). Ag^+ + e^- \rightarrow Ag AgBr + e^-\rightarrow Ag + Br^- You are unable to use Br_{2} + 2e^- \rightarrow 2Br^- because there is no Br_{2} in the equation. ...
Thu Feb 02, 2017 4:24 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: When does ΔG = 0?
Replies: 1
Views: 291

### When does ΔG = 0?

I know that it equals to 0 at equilibrium, but what are some examples of it being in equilibrium?
Fri Jan 27, 2017 1:10 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Cv and Cp
Replies: 1
Views: 338

### Re: Cv and Cp

Yeah I think it'll be best to memorize them or at least know how to deduce them because Dr. Lavelle had done a few calculations with them in lecture. In Chapter 9, there were some problems that required this concept and just make sure you can distinguish the difference between when to use atoms, lin...
Sat Jan 21, 2017 5:51 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: definition of isothermic reversible expansion [ENDORSED]
Replies: 1
Views: 379

### Re: definition of isothermic reversible expansion[ENDORSED]

An isothermal reversible expansion is basically just a process conducted where the temperature remains constant during the entire operation. So in an isothermal reversible expansion, you have a gas cylinder with a piston. The piston is placed in a constant temperature setting (like a water bath; thi...