Search found 10 matches

by Kimberly Waszak 2G
Sat Mar 12, 2016 9:14 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Arrow Pushing
Replies: 1
Views: 288

Arrow Pushing

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...
by Kimberly Waszak 2G
Sun Mar 06, 2016 8:20 pm
Forum: *Aldehydes
Topic: (E)-3-Phenyl
Replies: 1
Views: 719

(E)-3-Phenyl

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! :)
by Kimberly Waszak 2G
Sat Feb 27, 2016 9:19 pm
Forum: *Alkanes
Topic: Introduction to Organic Chemistry
Replies: 1
Views: 207

Introduction to Organic Chemistry

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 :)
by Kimberly Waszak 2G
Sun Feb 21, 2016 8:43 pm
Forum: *Electrophilic Addition
Topic: Course Reader pg 87
Replies: 1
Views: 307

Course Reader pg 87

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...
by Kimberly Waszak 2G
Sat Feb 13, 2016 7:17 pm
Forum: General Rate Laws
Topic: Pre-Equilibrium Approach
Replies: 1
Views: 267

Pre-Equilibrium Approach

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! :)
by Kimberly Waszak 2G
Sun Feb 07, 2016 6:14 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Using Pt in Cell Diagrams
Replies: 1
Views: 282

Using Pt in Cell Diagrams

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) ??
by Kimberly Waszak 2G
Sun Jan 31, 2016 9:04 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Calculating Ecell (course reader)
Replies: 2
Views: 404

Calculating Ecell (course reader)

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! :)
by Kimberly Waszak 2G
Sun Jan 24, 2016 5:59 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Workbook Problem 9 Practice Quiz 2
Replies: 2
Views: 779

Workbook Problem 9 Practice Quiz 2

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...
by Kimberly Waszak 2G
Sun Jan 24, 2016 5:31 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Intensive/Extensive
Replies: 4
Views: 475

Re: Intensive/Extensive

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...
by Kimberly Waszak 2G
Sun Jan 10, 2016 3:03 pm
Forum: Phase Changes & Related Calculations
Topic: Melting/Evaporation vs Vaporization
Replies: 4
Views: 885

Re: Melting/Evaporation vs Vaporization

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.

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