Search found 26 matches
- Wed Mar 15, 2017 7:04 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Exam Details and Review Sessions Winter 2017
- Replies: 114
- Views: 27094
Re: Final Exam Details and Review Sessions Winter 2017
In regards to homework questions that may be on the exam - Can these questions come from any problem set over the course of the quarter? Or will they only come from homework problems assigned after the midterm? Thanks!
- Wed Mar 15, 2017 7:03 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Exam Details and Review Sessions Winter 2017
- Replies: 114
- Views: 27094
Re: Final Exam Details and Review Sessions Winter 2017
For question 3C from the winter 2016 final: I assumed that AgBr would dissociate in solution, leaving Ag + and Br - . Because of this, I wrote my cell diagram as Ag(s)|Ag + (aq)||Br - (aq)|Br 2 (g)|Pt(s) Why is this incorrect? And why, in the correct answer, can you use Br - (aq) for the cathode but...
- Mon Mar 13, 2017 10:58 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3591851
Re: Post All Chemistry Jokes Here
Pushed didn't read the lab safety rules
- Thu Mar 02, 2017 9:54 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3591851
Re: Post All Chemistry Jokes Here
Poor Susie </3
- Thu Mar 02, 2017 9:53 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3591851
- Thu Mar 02, 2017 9:48 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3591851
Re: Post All Chemistry Jokes Here
Cute cartoon!
- Fri Feb 24, 2017 2:19 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3591851
Re: Post All Chemistry Jokes Here
What we reviewed in class today:
- Tue Feb 14, 2017 3:50 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Units for Gibbs Free Energy
- Replies: 4
- Views: 911
Units for Gibbs Free Energy
Is there a difference between using kJ vs. kJ/mol when labelling Gibbs Free Energy? I've run across a few problems where you must multiply each molecule's standard value of formation by its number of moles in the reaction, but sometimes the units for the free energy of the reaction are written diffe...
- Thu Feb 09, 2017 4:18 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Winter 2013 Midterm #8B
- Replies: 2
- Views: 615
Winter 2013 Midterm #8B
When I was solving for the concentration of Fe 2+ ions, I used the Nernst Equation that included ln instead of log. For most of the other problems in that midterm, answers using either ln or log were both stated as acceptable, but for #8B (pg.135) it looks like only the log equation should have been...
- Tue Feb 07, 2017 10:42 am
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm Winter 2017
- Replies: 87
- Views: 21077
Re: Midterm Winter 2017
Will we need to do derivations on the midterm? Or will it be similar to last quarter where we did not need to worry about them? Thanks!
- Tue Feb 07, 2017 10:41 am
- Forum: Student Social/Study Group
- Topic: Study group for mid term
- Replies: 4
- Views: 1087
Re: Study group for mid term
Would you guys be having the study session somewhere on the hill? I'd love to come and join(:
- Tue Jan 31, 2017 4:28 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 1 Preparation Answers
- Replies: 130
- Views: 25657
Re: Quiz 1 Preparation Answers
-Write out the equation for the combustion of propane and make sure to balance the eqn. -From the given standard enthalpy of combustion (kJ/mol), figure out how many moles of propane is burned in order to release 2580. kJ of heat.(use stoichiometry). -Convert moles to mass using MM. Just let me kno...
- Mon Jan 30, 2017 4:11 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3591851
Re: Post All Chemistry Jokes Here
A photon checks into a hotel and is asked if he needs any help with his luggage. He says, "No, I'm traveling light!"
- Mon Jan 30, 2017 4:08 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3591851
Re: Post All Chemistry Jokes Here
Two chemists go into a bar. The first one says, "I think I'll have an H2O." The second one says, "I think I'll have an H2O too," and he died shortly afterwards.
- Fri Jan 20, 2017 10:59 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3591851
Re: Post All Chemistry Jokes Here
What do you do with a sick chemist?
If you can't helium and you can't curium, you might as well barium!
If you can't helium and you can't curium, you might as well barium!
- Sat Dec 03, 2016 11:06 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: HClO3 as an acid
- Replies: 1
- Views: 981
HClO3 as an acid
I was just wondering whether or not we consider HClO3 to be a strong acid? In the list of strong acids on page 163 of the course reader, it isn't listed. However, in some of the review sessions I believed I heard some of the TAs saying that we are considering it as a strong acid for this class? Just...
- Sat Dec 03, 2016 10:36 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Confusion with n, l, ml, ms.
- Replies: 2
- Views: 1506
Re: Confusion with n, l, ml, ms.
If the question states that n=2 and l=0, you would be looking at the s subshell of row 2. If we look at the periodic table, we can see that there are only 2 elements that fall in this specific subshell (lithium and beryllium) so your answer would then be 2. Boron, carbon, nitrogen, oxygen, fluorine,...
- Sat Nov 26, 2016 9:19 pm
- Forum: Student Social/Study Group
- Topic: Final Study Group
- Replies: 12
- Views: 2470
Re: Final Study Group
I think it's a great idea to meet up on Tuesday once we're all probably back at UCLA again - Courtside is usually a pretty quiet building in general so I think Celina's idea to meet there would work perfectly! And if it's too busy in C6 for some reason, we can always check out one of the other loung...
- Sat Nov 19, 2016 11:54 pm
- Forum: Lewis Acids & Bases
- Topic: Reaction of 2 H20 [ENDORSED]
- Replies: 1
- Views: 478
Reaction of 2 H20 [ENDORSED]
Could someone please remind me how we know that the reaction
2H2O (l) <=> H3O+ (aq)+ OH- (aq)
heavily favors the left hand side? I was going through my notes and it looks like I hadn't made a note of the reason why. Thank you!
2H2O (l) <=> H3O+ (aq)+ OH- (aq)
heavily favors the left hand side? I was going through my notes and it looks like I hadn't made a note of the reason why. Thank you!
- Sat Nov 19, 2016 11:46 pm
- Forum: Student Social/Study Group
- Topic: Final Study Group
- Replies: 12
- Views: 2470
Re: Final Study Group
I think it would be a great idea to have a final study group! Would anyone else like to?
- Sun Nov 13, 2016 4:01 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Finding Coordination Number and Oxidation State [ENDORSED]
- Replies: 7
- Views: 6383
Re: Finding Coordination Number and Oxidation State [ENDORSED]
Thank you for correcting my mistake, Matt! I keep confusing NH3 with NH4, which is why I thought there was a +1 charge. Sorry if I caused any confusion!
- Sun Nov 13, 2016 3:13 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Finding Coordination Number and Oxidation State [ENDORSED]
- Replies: 7
- Views: 6383
Re: Finding Coordination Number and Oxidation State [ENDORSED]
The coordination number essentially means the number of bonds that form around the central atom (The transition metal). In the example you gave, the coordination number would be 4 because there are 4 molecules that form bonds with Pt. In order to find the oxidation number, you need to look at the ch...
- Sun Nov 13, 2016 2:14 pm
- Forum: Naming
- Topic: Atoms Outside of the Coordination Complex
- Replies: 1
- Views: 435
Atoms Outside of the Coordination Complex
When you have an atom outside of the coordination complex - Such as the K in K2[Ni(CN)4)] - does it affect the coordination number of the complex at all? What does it bond to? Thanks!
- Fri Nov 11, 2016 3:49 pm
- Forum: Ionic & Covalent Bonds
- Topic: Polar/Nonpolar Covalent bonds vs. Ionic bonds
- Replies: 1
- Views: 851
Polar/Nonpolar Covalent bonds vs. Ionic bonds
This is a question I asked a while ago, but my post didn't go through and I'd love some clarification! I remember in my high school chemistry class we split bonds into those three different categories based on specific electronegativity differences (For example, a non polar bond would be a differenc...
- Fri Nov 11, 2016 3:41 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Molecular Orbital Theory for HF
- Replies: 1
- Views: 501
Molecular Orbital Theory for HF
Possibly a silly question but could someone give me a quick explanation about why the 1S atomic orbital for hydrogen is roughly the same energy as the 2P orbital for Fluorine? I assumed that hydrogen's 1S orbital would be closer in energy to fluorine's 2S orbital than the 2P. Thanks a bunch(:
- Fri Sep 30, 2016 3:15 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Where to begin? [ENDORSED]
- Replies: 8
- Views: 1764
Re: Where to begin? [ENDORSED]
The video modules have been an amazing review tool both before the class began and after the lectures during the week (I 100% recommend using them), but do the topics posted on the class website stretch for the entire quarter? Or are there chapters later on that won't be accompanied by those videos?...