Search found 18 matches

by Jeffrey Wang
Sun Mar 06, 2016 11:38 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Question 3.16
Replies: 1
Views: 340

Question 3.16

Could someone explain this question in the orange book? I don't understand why it's necessary to do a ring flip. And what makes the model a chair structure? Is that how you represent in a 2-D model?
by Jeffrey Wang
Sun Mar 06, 2016 8:38 pm
Forum: Administrative Questions and Class Announcements
Topic: Video Competition
Replies: 66
Views: 25367

Re: Video Competition

We still aren't able to upload our video even if the video capacity was increased to 5 TB. Our video is 2 GB but we still aren't able to upload it. I have attached the YouTube link (please see posts up above).

https://www.youtube.com/watch?v=oCdpA-OGexg
by Jeffrey Wang
Sun Mar 06, 2016 5:38 am
Forum: Administrative Questions and Class Announcements
Topic: Video Competition
Replies: 66
Views: 25367

Re: Video Competition

Here is our video about the Arrhenius Equation. Please note that it is extremely weird and we made it when we were very tired. We sincerely hope no one is offended by this. Hopefully you get a laugh out of this. Enjoy! This video was made by: Marla Dimetrios (Lec. 3) Jonathan Shih Jeffrey Wang (Lec....
by Jeffrey Wang
Sun Feb 28, 2016 11:27 pm
Forum: *Alkanes
Topic: Bicycloalkanes
Replies: 1
Views: 266

Bicycloalkanes

Can someone explain how the bridge occurs and what occurs to the structure of the molecule? I'm reading section 1.8 but it still doesn't make sense. Why could the carbons fuse? Do one of them just leave, or is some double bond formed (which I know doesn't make sense because these are alkane structur...
by Jeffrey Wang
Sun Feb 21, 2016 10:22 pm
Forum: *Nucleophiles
Topic: Is this a nucleophile?
Replies: 1
Views: 329

Is this a nucleophile?

Can CH3NH2 react as a nucleophile? Why or why not?
by Jeffrey Wang
Sun Feb 14, 2016 11:44 pm
Forum: General Rate Laws
Topic: Example 15.2 (pg.621-622)
Replies: 1
Views: 275

Example 15.2 (pg.621-622)

Could someone please explain this example from the textbook? I don't understand how to determine the reaction orders or what's going on in general. Like why does the rate change for Br- change by the factor 3.5 /1.2. I'm just so confused with the entire process.
by Jeffrey Wang
Tue Feb 09, 2016 7:21 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Midterm Winter 2014 Q. 7 and 8
Replies: 2
Views: 557

Midterm Winter 2014 Q. 7 and 8

I don't understand how to make which half reaction either part of the anode or the cathode. Like for #7, it makes sense that Zn 2+/Zn is the anode, as it needs to be oxidized, therefore making the cell potential overall a positive value and a favorable reaction. But for #8, what makes the first equa...
by Jeffrey Wang
Tue Feb 09, 2016 5:16 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Question 14.91
Replies: 1
Views: 276

Question 14.91

The question is: "A voltaic cell is functions only when the electrical circuit is complete. In the external circuit the current is carried by the flow of electrons through a metal wire. Explain how the current is carried though the cell itself." The answer key says that a negatively charge...
by Jeffrey Wang
Sun Feb 07, 2016 7:45 pm
Forum: Van't Hoff Equation
Topic: Van't Hoff Equation
Replies: 5
Views: 1396

Van't Hoff Equation

I don't quite understand when and why I need to use this equation. What is its relevance to delta H? What is an example of the problem that utilizes this?
by Jeffrey Wang
Sun Jan 31, 2016 8:50 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Question 14.47
Replies: 1
Views: 418

Question 14.47

How do you approach this problem? I understand there is a salt bridge and there's interface between phases, but are you supposed to set up half-reactions? If so, how do you do it for a problem like that?
by Jeffrey Wang
Sun Jan 24, 2016 12:37 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Question 8.45 C
Replies: 1
Views: 317

Question 8.45 C

Is there an error in the solutions manual? Why would you do 358.8 kJ/mol / 4 mol? Shouldn't you multiply them? The units don't cancel out.
by Jeffrey Wang
Sat Jan 23, 2016 11:44 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Question 8.41
Replies: 1
Views: 239

Question 8.41

Could someone explain why we use the we use the heat capacity for liquid water, 4.184 J/C g, for both sides of the calculation rather than the heat capacity of ice, 2.03 J/C g for one side? And why is it necessary to add the delta H of melting for the calculation?
by Jeffrey Wang
Mon Jan 18, 2016 10:12 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Molar Heat Capacity of Ideal Gas (textbook pg.280)
Replies: 1
Views: 271

Molar Heat Capacity of Ideal Gas (textbook pg.280)

I don't understand what the equipartition theorem has to do with the modeling ideal gases. Where does the book get the ideal temperature as 3/2 RT for the monotomic ideal gas given? How do they calculate the rotational and transitional values for the nonlinear molecules? Is this a very important con...
by Jeffrey Wang
Sun Jan 10, 2016 6:08 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard Enthalpy of Formation (8.63)
Replies: 1
Views: 397

Standard Enthalpy of Formation (8.63)

For question 8.63, the textbook says the enthalpy of formation for K2S is -471.5 kJ*mol^-1, but in the solution manual, it is given as -417.5 kJ*mol^-1 . Which is the correct value? Also, on all the parts of 8.63, the units is given as kJ, but on 8.59, which is the exact same problem format (Hess's ...
by Jeffrey Wang
Sun Nov 22, 2015 9:30 pm
Forum: Naming
Topic: How To Name Coordination Compounds (VIDEO)
Replies: 1
Views: 388

How To Name Coordination Compounds (VIDEO)

This is our video for naming coordination compounds from chemical formulas as well as writing formulas for the names of coordination compounds. The topics include the rules and procedure for naming coordination compounds, charge balancing, and oxidation numbers of transition metals. Hope you enjoy a...
by Jeffrey Wang
Sun Nov 08, 2015 9:52 pm
Forum: Naming
Topic: Chelation
Replies: 1
Views: 285

Chelation

What do we need to know and understand about chelation? I remember Dr. Lavelle talking about EDTA and how its very effective in treating heavy metal poisoning, but how does it relate to coordination compounds?
by Jeffrey Wang
Sun Nov 01, 2015 1:02 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Difference Between Polar and Nonpolar Bonds
Replies: 2
Views: 1530

Difference Between Polar and Nonpolar Bonds

Could someone please explain why water, H2O, is a polar bond, whereas a molecule like CS2 is nonpolar? Don't the dipole moments in both the molecules end up cancelling each other equally?
by Jeffrey Wang
Sat Oct 10, 2015 7:32 pm
Forum: Properties of Electrons
Topic: Atomic Spectra - Question 1.11
Replies: 2
Views: 531

Atomic Spectra - Question 1.11

Could someone please explain Question 1.11? I don't understand how an electron could get excited and then fall back down to n=2 (Ballmer series) or n=3 (Paschen series) and not always the ground state at n=1 (Lyman series)? Conceptually, shouldn't the electron always reach the ground state once it h...

Go to advanced search