Search found 18 matches

by 604183253
Thu Mar 13, 2014 11:23 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Winter Final 2011 Question 3B
Replies: 4
Views: 589

Winter Final 2011 Question 3B

Why is it that for calculating Q the concentration of MnO2 is not taken into consideration?
by 604183253
Tue Mar 11, 2014 8:25 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Winter Final 2010 Question 3A
Replies: 3
Views: 733

Winter Final 2010 Question 3A

How would we be able to predict the sign of Delta S of the system?
by 604183253
Mon Mar 10, 2014 11:08 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Winter Final 2008 Question 1A
Replies: 3
Views: 503

Re: Winter Final 2008 Question 1A

Oh wow. I didn't even think to look at the formula pages. Thanks!
by 604183253
Mon Mar 10, 2014 10:38 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Winter Final 2008 Question 1A
Replies: 3
Views: 503

Winter Final 2008 Question 1A

How did they find Delta H of liquid water to be -285.85 kJ/mol?
by 604183253
Tue Feb 25, 2014 8:05 pm
Forum: First Order Reactions
Topic: Quiz Prep 2 page 40
Replies: 2
Views: 538

Re: Quiz Prep 2 page 40

Oh ok, thank you!
by 604183253
Tue Feb 25, 2014 8:04 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Catalysts in a reaction
Replies: 2
Views: 579

Re: Catalysts in a reaction

Thank you very much for that explanation! I figured that was the difference, but I wanted to make sure!
by 604183253
Mon Feb 24, 2014 7:20 pm
Forum: First Order Reactions
Topic: Quiz Prep 2 page 40
Replies: 2
Views: 538

Quiz Prep 2 page 40

In number 7 on page 40 of the workbook, how did they find k to be ln 2/32 d?
by 604183253
Mon Feb 24, 2014 7:05 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Catalysts in a reaction
Replies: 2
Views: 579

Catalysts in a reaction

How do you determine a catalyst from an intermediate in a reaction mechanism?
by 604183253
Sun Feb 16, 2014 10:45 pm
Forum: General Rate Laws
Topic: CH 14.17 (homework problem)
Replies: 2
Views: 500

Re: CH 14.17 (homework problem)

Thank you very much!
by 604183253
Sun Feb 16, 2014 6:15 pm
Forum: General Rate Laws
Topic: CH 14.17 (homework problem)
Replies: 2
Views: 500

CH 14.17 (homework problem)

I don't understand how to determine the order for each reactant. Could someone explain this?
Specifically for C?
by 604183253
Fri Feb 07, 2014 12:39 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Midterm 2011 Questions 6D and 7/8 C
Replies: 1
Views: 346

Midterm 2011 Questions 6D and 7/8 C

For both of these questions, you must use either the E = E(of cell) - RT/nF x ln Q or use E = E(of cell) - RT/nF x ln K.
For the solutions, instead of ln Q or ln K, log Q and log K were used. Why were those used and how can I tell which one to use on an exam?
by 604183253
Tue Feb 04, 2014 6:16 pm
Forum: Balancing Redox Reactions
Topic: CH 13 Problem 1a
Replies: 5
Views: 6567

Re: CH 13 Problem 1a

Oh wow. Thank you very, very much! It makes so much more sense!
by 604183253
Tue Feb 04, 2014 4:17 pm
Forum: Balancing Redox Reactions
Topic: CH 13 Problem 1a
Replies: 5
Views: 6567

Re: CH 13 Problem 1a

Thank you for your reply, but I still don't understand how to get the oxidation numbers and how they came to the conclusion of Cr being reduced from 6+ to 3+ and that C is oxidized from 2- to 1-.
by 604183253
Mon Feb 03, 2014 7:18 pm
Forum: Balancing Redox Reactions
Topic: CH 13 Problem 1a
Replies: 5
Views: 6567

CH 13 Problem 1a

I don't understand how the book or the solutions manual come up with the answer to this question, especially when comparing it to an example in the book and an example the Professor gave in lecture.
by 604183253
Sun Jan 26, 2014 1:56 pm
Forum: Student Social/Study Group
Topic: Study Groups!
Replies: 6
Views: 2079

Re: Study Groups!

If it's all online, I'm in!
by 604183253
Tue Jan 14, 2014 8:41 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: HW 7.67 Calculating the reaction enthalpy
Replies: 1
Views: 301

HW 7.67 Calculating the reaction enthalpy

I got the reaction enthalpy to be -307.6 kJ; the first equation needed to be reversed and multiplied by two to get HCl into the correct moles, the second needed to be divided by 3 to get H2 into the proper moles (is that a correct assumption?), and the third was to be left alone. The solutions manua...

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