## Search found 17 matches

Sat Mar 18, 2017 6:50 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Calculating emf based on the reactants- 2014 Q3
Replies: 2
Views: 461

### Re: Calculating emf based on the reactants- 2014 Q3

I'm assuming that the reduction potentials were given on a sheet that was not included in the course reader. If you look up the reduction potentials involved in the question it works out! Here is the work: For this question, we are trying to build a galvanic cell that has the highest overall voltage...
Sat Mar 18, 2017 6:46 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 2014 Winter Final
Replies: 3
Views: 657

### Re: 2014 Winter Final

Unfortunately for this question we are missing a table of reduction potentials. For this question, we are trying to build a galvanic cell that has the highest overall voltage. Here are the missing reduction potentials: Zn (2+) + 2e -> Zn (s) -.763V Fe (2+) + 2e -> Fe (s) -.44V Fe (3+) + e -> Fe (2+)...
Sat Mar 18, 2017 6:07 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Chair Flipping
Replies: 2
Views: 748

### Re: Chair Flipping

For chair flipping, you flip the two triangular parts (the back of the chair switches to footrest and vice versa). In doing so, the axials flip to equatorials. If you type in chair conformation flip on google, there are some really good drawings!
Sat Mar 18, 2017 6:00 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 282
Views: 134712

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

Dr. Lavelle, I can say that I've thoroughly enjoyed being in your chemistry class. I've learned so much in the class even outside the course material through this class. I appreciate everything you've done to help us succeed and even though it has been very difficult, it has been a great experience....
Tue Feb 21, 2017 6:32 pm
Forum: General Rate Laws
Replies: 1
Views: 356

In class, Dr. Lavelle mentioned that we would only be using the pre-equilibrium method!
Sun Feb 12, 2017 5:53 pm
Forum: Balancing Redox Reactions
Topic: Cell Diagrams
Replies: 1
Views: 306

### Cell Diagrams

When do we put H+, H2O, or OH- in the cell diagrams?

Thanks!
Fri Feb 10, 2017 12:42 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 14.13 part d
Replies: 1
Views: 273

### Re: 14.13 part d

For the half reactions, you know that Au is going to be both oxidized and reduced. Break it up into the half reactions then: Au+(aq) ->Au (s) Au+(aq) ->Au 3+ (aq) then calculate the oxidation numbers: Au+: +1 Au(s): 0 Au 3+: +3 Balance the overall oxidation numbers on both sides of the reaction by a...
Sun Jan 29, 2017 6:08 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: question on U=q+w equation
Replies: 2
Views: 443

### Re: question on U=q+w equation

If the pressure isn't constant, the reaction is most likely reversible. Therefore, the internal energy of the system would be 0 as all energy would be conserved.
Mon Jan 23, 2017 10:06 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Reversible/Irreversible processes In the book
Replies: 1
Views: 333

### Reversible/Irreversible processes In the book

In the textbook, the irreversible process given as an example is a piston where external pressure increases but results in no movement in the piston. How does that work and how exactly is that an irreversible process?

Thanks!
Fri Jan 13, 2017 7:42 pm
Forum: Student Social/Study Group
Topic: chem 14B workbook
Replies: 7
Views: 990

### Re: chem 14B workbook

Just so you know, even though we didn't have a workbook, there are still practice quizzes, midterms, and finals in the back of the course reader!
Sun Dec 04, 2016 7:48 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8039
Views: 1410120

### Re: Post All Chemistry Jokes Here

What is the name of 007's arctic cousin?

Polar bond
Thu Dec 01, 2016 9:42 am
Forum: Lewis Acids & Bases
Topic: Difference between Bronsted and Lewis
Replies: 1
Views: 393

### Re: Difference between Bronsted and Lewis

Bronsted-Lowrey deals with the transfer of a proton. Lewis acid and bases deal with the transfer of an electron pair. Note that a BL acid donates a proton whereas the Lewis acid accepts an electron pair
Mon Nov 14, 2016 3:05 pm
Forum: Ideal Gases
Topic: Chemical equilibrium
Replies: 4
Views: 782

### Re: Chemical equilibrium

Also note that in chemical equilibrium, though equilibrium is constant, the reaction itself isn't static. There is just movement in the forward and reverse directions
Sun Oct 23, 2016 9:33 pm
Forum: Lewis Structures
Topic: Lewis Structures
Replies: 3
Views: 441

### Re: Lewis Structures

I would check the formal charge. I checked formal charge in the practice quiz and got a different lewis structure. Since it doesn't have the answers with it, I can't be completely positive, but you may get different structures.
Sun Oct 09, 2016 5:13 pm
Forum: Photoelectric Effect
Topic: Atomic absorption of energy
Replies: 2
Views: 523

### Atomic absorption of energy

What exactly does it look like if an atom absorbs energy? Does it change into more kinetic energy of the atom?
(i.e. If an electron absorbs a photon from n=2, moves to n=5, then comes down to n=3, what does the energy not let off as light do to the atom?)

Thanks!
Wed Oct 05, 2016 10:36 am
Forum: Einstein Equation
Topic: HW chapter 1 problem 23 [ENDORSED]
Replies: 2
Views: 572

### Re: HW chapter 1 problem 23[ENDORSED]

We talked about this in my discussion lecture today! Our TA said that we will be given the value for the conversion as well as values like the masses of protons, electrons, and neutrons.

Hope this helps!
Tue Sep 27, 2016 8:41 am
Forum: Student Social/Study Group
Topic: Rieber Hall 14A Study Group (Fall 2016)
Replies: 49
Views: 7202

### Re: Rieber Hall 14A Study Group (Fall 2016)

Yes! I'd love to be a part of this! Do we want to start a groupme so we can plan meetings?