Search found 8 matches
- Sun Feb 08, 2015 12:42 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Wednesday Quiz #2 (2015)
- Replies: 3
- Views: 996
Wednesday Quiz #2 (2015)
The question was as follows: A 100.0L vessel containing 6.00mol of Ne at 2.00atm is cooled to 203.0K. Assuming the monoatomic gas behaves ideally, calculate delta U and delta H for this process and describe the thermodynamic reaction. I calculated the initial temperature and got -203.2K but I am unc...
- Sat Feb 07, 2015 6:56 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Homework Question 13.37A- Significant Figures for e
- Replies: 2
- Views: 816
Homework Question 13.37A- Significant Figures for e
I went through the process indicated in the solutions manual. My work matched the manual up until the final answer was given. I calculated that the final value for Q was 3.27x10^6 while the solutions manual indicates that Q is 10^6. Is there a reason for leaving out the 3.27 and simply rounding to 1...
- Wed Feb 04, 2015 10:17 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Homework Question 13.11D
- Replies: 1
- Views: 387
Homework Question 13.11D
For part D on homework question 13.11D, I am unsure how to approach the half reaction which includes the OH-
Since the oxygen gas yields OH- are we to balance the O2 gas by adding a coefficient of 2 to the OH-? Or are we to balance the O's by adding H2O?
Thank you!
Since the oxygen gas yields OH- are we to balance the O2 gas by adding a coefficient of 2 to the OH-? Or are we to balance the O's by adding H2O?
Thank you!
- Tue Jan 27, 2015 5:45 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Question regarding 'C' value in Entropy calculations
- Replies: 6
- Views: 1873
Question regarding 'C' value in Entropy calculations
A practice problem was stated as such: Suppose 150.0g of ethanol at 22.0 degrees Celsius is mixed with 200.0g of ethanol at 56.0 degrees Celsius at constant atmospheric pressure in a thermally insulated vessel. If the final temperature after mixing is 300.90K, calculate the change in entropy for hot...
- Wed Dec 10, 2014 4:50 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Q8 2009 Final Exam
- Replies: 1
- Views: 495
Q8 2009 Final Exam
My interpretation of this question is that it presents NaHCO3 and HCl as the reactants. When it comes to completing the ICE chart, they appear as products. The order, of course, has an effect on the K(acid) calculation because products go on top and reactants on the bottom. How are we to know to put...
- Tue Nov 11, 2014 7:24 pm
- Forum: Photoelectric Effect
- Topic: Relationship between photons emitted per second & wavelength
- Replies: 1
- Views: 686
Relationship between photons emitted per second & wavelength
On the first quiz, there is a question that asks, "How does the number of photons emitted per second change if the laser produces light with longer wavelengths?"
I thought that the longer the wavelength, the lower the energy, and thus less photons are emitted. Why is this incorrect?
I thought that the longer the wavelength, the lower the energy, and thus less photons are emitted. Why is this incorrect?
- Sun Nov 02, 2014 6:24 pm
- Forum: Bond Lengths & Energies
- Topic: Calculating bond length
- Replies: 2
- Views: 820
Re: Calculating bond length
Also on the average bond length chart at the top of page 82, it also has an O-H bond length, and that one is 96, which is 7 pm less than the length given by the chart on the bottom, and 15 pm less than the O-H bond given for ethanol. Is anything true? Or is everything just a lie? Are we in the matrix?
- Sat Oct 25, 2014 11:02 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Exceptions to Electron Configurations
- Replies: 4
- Views: 4536
Exceptions to Electron Configurations
For the ion Sn^4+ why is the electron configuration [Kr]4d^10 instead of [Kr]4d^8 5s^2? The only exceptions I recall discussing are elements in groups 6 and 11, when an electron from the s-orbital jumps into the d orbital to make the element more stable/symmetrical. This ion is in group 10 if I'm no...