Search found 11 matches

by Esther_Choe_1K
Thu Mar 16, 2017 8:38 pm
Forum: Student Social/Study Group
Topic: Strategies for studying for the final
Replies: 7
Views: 826

Re: Strategies for studying for the final

I'm writing a summary sheet of equations, esp for themodynamics and thermoschemistry, and important details associated with the main concepts as I go through the homework problems. I also try to recall as much information I've learned for each topic and what methods I will use for certain problems. ...
by Esther_Choe_1K
Sat Mar 11, 2017 10:30 pm
Forum: *Haloalkanes
Topic: Functional Groups [ENDORSED]
Replies: 7
Views: 1382

Re: Functional Groups [ENDORSED]

For the amine functional groups, where N is bonded to one or more carbon chains, when N is bonded to four carbon chains it has a charge of 1+. When Nitrogen is bonded to three carbon chains it has no charge. In general, how do we know how many bonds it takes for an atom to have no charge? Thank you!
by Esther_Choe_1K
Sat Mar 04, 2017 1:13 am
Forum: *Nucleophilic Substitution
Topic: Electron flow arrows
Replies: 2
Views: 672

Re: Electron flow arrows

By what my TA says, when asked to draw the reaction mechanism, the arrows should be enough. Indicating the dipole isn't mandatory but it can help avoid mistakes. Just make sure that the tail of the arrow starts from the nucleophile and points to the electrophile.
by Esther_Choe_1K
Sun Feb 26, 2017 11:33 pm
Forum: *Electrophiles
Topic: electrophiles and nucleophiles
Replies: 2
Views: 304

Re: electrophiles and nucleophiles

According to the introduction to organic chemistry book, a nucleophile is any electron-rich species. Therefore, nucleophiles are often negatively charged but do not have to be. They can be neutral. A helpful way to remember that nucleophiles are usually negatively charged is that it is "nucleus...
by Esther_Choe_1K
Sun Feb 12, 2017 4:55 pm
Forum: Balancing Redox Reactions
Topic: balancing redox reactions
Replies: 2
Views: 287

Re: balancing redox reactions

(Balancing Oxygen, then Hydrogen, then add electrons to balance charges) First you balance the oxygen by adding H20 to the side that needs it.(ex: If you need 4 oxygen atoms on the right side, you would add 4H2O to the right side.) Then you balance the hydrogens differently depending on whether its ...
by Esther_Choe_1K
Sun Feb 12, 2017 4:47 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Problem 14.15
Replies: 4
Views: 509

Re: Problem 14.15

For Question 14.15 part A, I am not sure how the half reactions are obtained, particularly the oxidation half reaction. I know that bromine is being oxidized from 1- to 0 but how do we know exactly that the Ag added to the Br- is the solid Ag and not the aqueous Ag? Thank you for any help!
by Esther_Choe_1K
Sun Feb 12, 2017 2:30 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: E and E°, G and G°
Replies: 3
Views: 764

Re: E and E°, G and G°

I wanted to clarify/add to the explanation above. The textbook has a table with the E node values of the REDUCTION reactions (aka standard reduction potentials) we need to know for this class. If you have the balanced reduction reaction, you can look up the E node of the reaction. You can plug this ...
by Esther_Choe_1K
Sat Feb 11, 2017 6:14 pm
Forum: Administrative Questions and Class Announcements
Topic: Posts
Replies: 23
Views: 2763

Re: Posts

I'm still having trouble on posting a topic. The FAQ didn't help. The"post a new topic" button is not on the bottom left or the top left of a forum page. What might be the problem? I can only post replies to a forum that already exists.
by Esther_Choe_1K
Sun Feb 05, 2017 10:11 pm
Forum: Administrative Questions and Class Announcements
Topic: Posts
Replies: 23
Views: 2763

Re: Posts

Does anyone know how to post a new topic/question? I've been trying to figure this out and have been answering questions until now. I couldn't locate the "add post" anywhere on the page. I've even looked at the FAQs and the answer there didn't help. Please let me know; thank you! :)
by Esther_Choe_1K
Sun Jan 29, 2017 8:41 pm
Forum: Calculating Work of Expansion
Topic: max amount of work
Replies: 4
Views: 426

Re: max amount of work

If a process does work on the surrounding, you get more work out of the process if it is done slowly. This is because less heat is lost to the surroundings. Therefore, a reversible process, infinitely small does the maximum work. One example of a reversible process is the work done by a gas expandin...
by Esther_Choe_1K
Sun Jan 15, 2017 11:29 am
Forum: Calculating Work of Expansion
Topic: Reversible and Irreversible Processes
Replies: 2
Views: 286

Re: Reversible and Irreversible Processes

I have the same question specifically regarding why the work a system can do is greatest in a reversible process..

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