CHEMISTRY COMMUNITY

Kimberly Waszak 2G

I always thought that when drawing arrows, they had to start on bonds or lone pairs and end on bonds or atoms... However, in the Winter 2014 Final Exam question 7, it shows arrows going off into nowhere (for example, in the first box). Would there be a difference in the final molecule if they were p...

Kimberly Waszak 2G

In the orange course reader on page 60, they name C6H5CHO as (E)-3-Phenyl-2-propenal (cinnamaldehyde).
First, how can we tell that it's trans/E from just the name and line structure? Is this just a visual thing I have to understand?
Also, where does the name "Phenyl" come from?

Thanks! :)

Kimberly Waszak 2G

On page 6 the example at the bottom of the page shows the answer 3-Ethyl-3,5dimethylheptane... can someone please explain what each of the numbers mean?? I can't seem to figure out the second three, but I think I may be mixing it up with the other numbers, I don't know!

Thanks in advance :)

Kimberly Waszak 2G

On the line structure example at the bottom of the page, how do we know whether the electrophilic addition is taking place at the functional group or at the carbon double bond? Would we be marked wrong for creating a line structure showing the reaction taking place at the functional group?? Thanks i...

Kimberly Waszak 2G

When deciding which is steps are slow vs. fast, will the separate steps always be given to us and we have to decide from there which is the rate determining step?
Also, how do we know when to include the reverse reaction or when it is too slow to be considered?

Thanks in advance! :)

Kimberly Waszak 2G

In the winter 2014 practice midterm, question 7 asks to write the cell diagram for the reaction
Zn(s) + 4H+(aq) + 2NO3- (aq) --> Zn2+ (aq) + 2NO2 (g) +2H2O(l)

The cell diagram is:
Zn (s)|Zn2+ (aq) || NO3- (aq), H+(aq)| NO2(g), Pt(s)

How do we know when and to include the Pt(s) ??

Kimberly Waszak 2G

For the example on page 50 of the course reader, if calculating E(cell)= E(cathode) - E(anode), why is the calculation 0.77-0.34 rather than 0.77 - (-0.34) (as we switched the sign of the anode to a negative when we flipped the equation)?

Thanks in advance! :)

Kimberly Waszak 2G

The question asks if a mole of gas is heated under constant pressure, compressed isothermally to its original volume, and then cooled at a constant volume, which values equal zero? The answer is deltaS(sys) and deltaG, but how can the change in entropy of the system equal zero while the change in en...

Kimberly Waszak 2G

An intensive property is one that does NOT depend on the amount of a substance, such as temperature or density. An extensive property is one that DOES depend on the amount of the substance. In these terms, it makes sense that energy is an extensive property, as the more you have of something, the mo...

Kimberly Waszak 2G

The process of a solid transitioning to the gaseous phase is called sublimation. This transition occurs directly, without having to go through the liquid phase.

CHEMISTRY COMMUNITY

Search found 10 matches

Arrow Pushing

(E)-3-Phenyl

Introduction to Organic Chemistry

Course Reader pg 87

Pre-Equilibrium Approach

Using Pt in Cell Diagrams

Calculating Ecell (course reader)

Workbook Problem 9 Practice Quiz 2

Re: Intensive/Extensive

Re: Melting/Evaporation vs Vaporization