When using the Nernst Equation, how do I know whether to use
E(cell)=E(cell)0 - RT/nF lnQ
or
E(cell)=E(cell)0 - 0.05916/n log Q?
In the practice finals in the back of the course reader, some problems use the first equation while others use the second.
Do they give the same result?
Thank you!
Search found 21 matches
- Sat Mar 18, 2017 8:15 am
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Nernst Equation
- Replies: 1
- Views: 479
- Tue Mar 07, 2017 10:58 am
- Forum: *Alkanes
- Topic: #1 quiz 3 preparation
- Replies: 2
- Views: 745
#1 quiz 3 preparation
Name the compound shown below. ..........................................CH(CH3)2 .............................................I CH3 CH2 CH2 CH2 CH2 CH2 CH CH2 CH2 CH3 (ignore the periods) The answer for this problem is 4-isopropyldecane or 4-(1-methylethyl) decane but I don't understand how to come...
- Sat Mar 04, 2017 9:08 am
- Forum: Administrative Questions and Class Announcements
- Topic: Friday Review Session Broadcast
- Replies: 3
- Views: 675
- Mon Feb 20, 2017 8:18 pm
- Forum: Second Order Reactions
- Topic: Homework Problem 15.19
- Replies: 3
- Views: 762
Re: Homework Problem 15.19
I am also not understanding this part of the problem. The solution manual states that the rate is increased by (3.02/1.25)^2 however I am not seeing how the rate is increased by this amount.
Thank you!
Thank you!
- Mon Feb 13, 2017 8:51 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Adding platinum
- Replies: 1
- Views: 391
Adding platinum
How do I know when to add Platinum to a cell diagram?
I thought platinum was added when there were no solids in the equation. However for homework problem 14.13 part b, the cell diagram is
Pt(s) I I^-(aq) I I2(s) II Ce^-4(aq), Ce^3+ (aq) I Pt(s)
I thought platinum was added when there were no solids in the equation. However for homework problem 14.13 part b, the cell diagram is
Pt(s) I I^-(aq) I I2(s) II Ce^-4(aq), Ce^3+ (aq) I Pt(s)
- Thu Feb 09, 2017 10:20 pm
- Forum: Balancing Redox Reactions
- Topic: Homework 14.1
- Replies: 3
- Views: 714
Homework 14.1
H^{+}(aq) + Cr_{2}O_{7}^{2-} (aq) + C_{2}H_{5}OH(aq) \rightarrow Cr^{3+}(aq) + C_{2}H_{4}O(aq) + H_{2}O(l) Identify the elements undergoing changes in oxidation state and indicate the initial and final oxidation numbers for these elements. The solutio...
- Mon Jan 30, 2017 12:57 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Quiz 1 prep #9
- Replies: 2
- Views: 627
Quiz 1 prep #9
A sample of 1 mol of gas initially at 1 atm and 298K is heated at constant pressure to 350K, then the gas is compressed isothermally to its initial volume and finally it is cooled to 298K at constant volume. Which of the following values is zero? -Delta S of surrounding and Delta G -Delta S of syste...
- Mon Jan 23, 2017 10:52 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: homework 8.49
- Replies: 2
- Views: 530
homework 8.49
question: Oxygen difluoride is a colorless, very poisonous fas that reacts rapidly with water vapor to produce O2, HF, and heat: OF2 + H2O ---> O2 + 2HF delta H = -318kJ What is the change in internal energy for the reaction of 1.00 mol OF2? The solution manual uses 298K as temperature. I was wonder...
- Wed Jan 18, 2017 4:37 pm
- Forum: Calculating Work of Expansion
- Topic: Homework 8.9 [ENDORSED]
- Replies: 3
- Views: 1036
Homework 8.9 [ENDORSED]
A piston confines 0.200 mol Ne(g) in 1.20 L at 25 degrees C. Two experiments are performed. (a) The gas is allowed to expand through an additional 1.20 L against a constant pressure of 1.00 atm. (b) The gas is allowed to expand reversibly and isothermally to the same final volume. Which process does...
- Thu Jan 12, 2017 10:48 pm
- Forum: Phase Changes & Related Calculations
- Topic: Most Helpful Resource
- Replies: 14
- Views: 2525
Re: Most Helpful Resource
I personally really liked the UA office hours because they are students that have taken this class before. So they tend to know what topics we would struggle in and they explain it in a way that is easy to understand. Also, UA sessions are done in small groups so it was easy to get my questions answ...
- Tue Nov 29, 2016 12:29 am
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: 12.61
- Replies: 4
- Views: 1281
12.61
problem:Find the initial concentration of the weak acid or base in each of the following aqueous solutions: (a) a solution of HClO with pH 4.60 In the solution manual, it says "Let x=nominal concentration of HClO" What is the nominal concentration and why do we use this instead of the ICE ...
- Sat Nov 26, 2016 8:04 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: change in temperature
- Replies: 2
- Views: 585
change in temperature
How does changing temperature affect a reaction?
I know that if a reaction is endothermic then it will favor products and if a reaction is exothermic it favors reactants forming.
But what does that exactly mean?
Thank you!
I know that if a reaction is endothermic then it will favor products and if a reaction is exothermic it favors reactants forming.
But what does that exactly mean?
Thank you!
Formula
When writing the formula for a complex compound, does the order of the ligands written matter?
- Wed Nov 09, 2016 8:41 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: MO diagram [ENDORSED]
- Replies: 2
- Views: 581
MO diagram [ENDORSED]
When drawing the molecular orbital diagram, why do we fill up the pi before the sigma?
For example, in the diagram for N2, pi2p would be filled up before sigma2p.
For example, in the diagram for N2, pi2p would be filled up before sigma2p.
- Tue Nov 01, 2016 9:28 pm
- Forum: Sigma & Pi Bonds
- Topic: pi bonds
- Replies: 1
- Views: 488
pi bonds
When we write the hybridization of pi bonds, why do we only mention the p orbital?
- Fri Oct 28, 2016 12:10 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic character
- Replies: 1
- Views: 444
Ionic character
How do I know what molecule/compound has more ionic character than another?
- Thu Oct 20, 2016 10:29 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron configuration for ions [ENDORSED]
- Replies: 2
- Views: 538
Electron configuration for ions [ENDORSED]
If we are writing the electron configuration of an ion such as Cl-, then is it [Ar] or [Ne] 3s2 3p6?
- Wed Oct 12, 2016 7:13 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Significant Figures
- Replies: 4
- Views: 1110
Significant Figures
What is the wavelength of the radiation emitted when an electron transitions from n = 4 to n=3?
I understand how to solve this question, however how many significant figures should the answer be?
I understand how to solve this question, however how many significant figures should the answer be?
- Tue Oct 04, 2016 11:31 pm
- Forum: Einstein Equation
- Topic: HW chapter 1 problem 23 [ENDORSED]
- Replies: 2
- Views: 827
HW chapter 1 problem 23 [ENDORSED]
Problem: The y-ray photons emitted by the nuclear decay of a technetium-99 atom used in radiopharmaceuticals have an energy of 140.511keV. Calculate the wavelength of these y-rays. The solution manual says that in order to convert eV to Joules we have to multiply the eV by 1.6022*10^-19. I was wonde...
- Fri Sep 30, 2016 2:53 pm
- Forum: Student Social/Study Group
- Topic: De Neve Study Group
- Replies: 35
- Views: 4816
Re: De Neve Study Group
I'm in Dogwood and I'm definitely interested!! Let me know if you guys are meeting!
- Mon Sep 26, 2016 11:13 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Question on G25
- Replies: 5
- Views: 1162
Re: Question on G25
For the solution above, is 0.050M necessary to figure out the answer to this problem?