Search found 13 matches

by Sue_Park_2D
Sat Mar 18, 2017 8:23 pm
Forum: *Ketones
Topic: Final 2015 #9b
Replies: 1
Views: 410

Final 2015 #9b

Why do we use "hydroxy" to indicate the alcohol groups in naming #9b instead using the -ol ending?
by Sue_Park_2D
Sat Mar 18, 2017 7:48 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Final 2011 #1c
Replies: 1
Views: 352

Final 2011 #1c

In Final 2011, #1c it asks for which has a greater residual entropy at 0K: NO or BF3.

The answer is NO, but I don't understand why.

Thank you.
by Sue_Park_2D
Sat Mar 18, 2017 5:09 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: (W 2010 Final )Which requires more heat?
Replies: 2
Views: 304

Re: (W 2010 Final )Which requires more heat?

Does the one mole of butane require more heat because it is larger in terms of atomic mass?
by Sue_Park_2D
Thu Mar 16, 2017 7:00 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Quiz 2
Replies: 3
Views: 485

Quiz 2

On the last question for quiz #2, I stated that the rate limiting step was step 2, but got it wrong. I thought step 1 could not be the rate limiting step because it was at equilibrium, shown by the double arrows between the reactants and products. I don't understand why step 1 would have to be the r...
by Sue_Park_2D
Sat Mar 04, 2017 3:35 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2017
Replies: 183
Views: 14438

Re: Quiz 3 Winter 2017

For number 1, I wrote down 4-isopropyldecane as my answer, but I don't understand why it can also be 4-(1-methleythyl) decane
by Sue_Park_2D
Wed Mar 01, 2017 11:57 am
Forum: *Free Energy of Activation vs Activation Energy
Topic: Self Test 4.4 A
Replies: 1
Views: 179

Self Test 4.4 A

I don't understand why step one would have the larger Ea when the y-axis was labeled potential energy for part c.

Are the reaction profiles different when potential energy v. gibbs free energy is on the y-axis?

Thank you in advance!
by Sue_Park_2D
Sun Feb 26, 2017 7:32 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Reaction Profile
Replies: 1
Views: 174

Reaction Profile

What exactly is a reaction profile? There is not much information on it on the course reader and wondering if anyone would provide a better explanation?

Thank you.
by Sue_Park_2D
Sun Feb 12, 2017 10:12 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Problem 14.15
Replies: 1
Views: 191

Problem 14.15

Problem 14.15 in the textbook asks "Write the half-reactions and devise a galvanic cell (write a cell diagram) to study each of the following reactions." Part (b) is H(aq)+OH(aq) --> H2O(l), the Brønsted neutralization reaction. I don't understand how to get the half reactions for this r...
by Sue_Park_2D
Sun Feb 05, 2017 4:44 pm
Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
Topic: Self-Test 14.13A
Replies: 1
Views: 255

Self-Test 14.13A

I was reading through the textbook and tried to solve out self test 14.13A on page 593. It says: "Predict the products resulting from the electrolysis of 1 m AgNO3(aq)." The answer is given to be [Cathode, Ag; anode, O2]. Even after reading the text and previous examples in the section, I ...
by Sue_Park_2D
Sun Jan 29, 2017 9:10 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 9.13 Changes in Entropy
Replies: 1
Views: 191

9.13 Changes in Entropy

I had a question on 9.13. "During the test of an internal combustion engine, 3.00 L of nitrogen gas at 18.5 C was compressed suddenly (and irreversibly) to 0.500 L by driving in a piston. In the process, the temperature of the gas increased to 28.1 C. Assume ideal behavior. What is the change...
by Sue_Park_2D
Sun Jan 22, 2017 7:08 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Question 8.19
Replies: 2
Views: 206

Re: Question 8.19

Oh, I see! Thanks for your explanation.
by Sue_Park_2D
Sun Jan 22, 2017 6:58 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Question 8.19
Replies: 2
Views: 206

Question 8.19

I understand how to do part a in finding the amount of heat needed to raise the temperature of 400.0g of water in 500.0g copper kettlel from 22 to 100 degrees celsius. (q= 1.4 x 10^2 kJ) However, I don't understand what it means in part b when it asks for the percentage of the heat used to raise the...
by Sue_Park_2D
Sun Jan 15, 2017 4:15 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hw question 8.57
Replies: 3
Views: 259

Re: Hw question 8.57

In this specific question of the HW you need to use Hess's Law, since they give you information of the standard enthalpy of combustion of C 2 H 2 , C 2 H 6 , and H 2 . But I think you can use standard enthalpies of formation because I tried calculating and I got the same answer of -312 kJ/mol. You m...

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