## Search found 17 matches

Sun Mar 19, 2017 6:10 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Exam points
Replies: 7
Views: 1024

### Re: Final Exam points

Did anyone find out how/when they check for posts? I asked 2 TA's and was under the impression that it would be fine. Not sure though.
Sun Mar 19, 2017 6:43 am
Forum: *Cycloalkenes
Topic: Where to start counting Winter 2013 final 6A
Replies: 6
Views: 3702

### Re: Where to start counting Winter 2013 final 6A

Dr. Lavelle told us not to use the sum of the numbers as a reliable way to figure out whether we have the right answer or not. Instead, if you see that there is another way to (correctly) answer the question that will provide you with a lower number in it, then you go with that one. So, in this case...
Sun Mar 19, 2017 6:31 am
Forum: General Rate Laws
Topic: Homework 15.65 part C
Replies: 2
Views: 795

### Homework 15.65 part C

For the reversible, one step reaction 2A <-- --> B+C, the forward rate constant for the formation of B is 265 L/mol x min and the rate constant for the reverse action is 392 L/mol x min. The activation energy for the forward reaction is 39.7 kJ/mol and that of the reverse reaction is 25.4 kJ/mol. Wh...
Sat Mar 18, 2017 9:34 pm
Forum: First Order Reactions
Topic: Calculating concentration #23c
Replies: 4
Views: 883

### Re: Calculating concentration #23c

So multiplying (2mol A/1 molB)(0.034 mol B /L) and then subtracting it from (0.0153 mol A/L) would give everything in terms of A. So, is the reason why we do it this way because we were only given [A]o and the concentration of B after a certain time & needed to get it all in terms of A? Thanks!
Sat Mar 18, 2017 2:10 am
Forum: *Cycloalkenes
Topic: Where to start counting Winter 2013 final 6A
Replies: 6
Views: 3702

### Re: Where to start counting Winter 2013 final 6A

As previously mentioned, the double bond takes priority and you have to move across the double bond. Also, to help figure out why the answer is not 2,3,4,4: If you start counting from the double bond and move left you will get 1,5,5,6 tetramethylcylohexene, instead of 2,3,4,4, tetramethyclyclohexene...
Sat Mar 18, 2017 2:01 am
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Winter Final 2013 6B
Replies: 1
Views: 690

### Winter Final 2013 6B

I was wondering how to approach this question: A facial cream known to assist with dry skin has the following common name ingredients listed: stearic acid; glycerin; and acetyl alcohol. Their restive IUPAC names are: octadecanoic acid; propane-1,2,3-triol; and hexadecan 1-ol. Write the common name a...
Sat Mar 18, 2017 1:17 am
Forum: Administrative Questions and Class Announcements
Topic: Final Exam Details and Review Sessions Winter 2017
Replies: 114
Views: 18150

### Re: Final Exam Details and Review Sessions Winter 2017

Will the posts made before the actual final be considered for the "weekly online discussion," so would a question posted tonight count? Thanks!
Mon Mar 13, 2017 5:47 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 291
Views: 136345

### Re: Saying Thank You to Dr. Lavelle

Dear Dr. Lavelle You're the best! Thank you for all the extra time and effort you've put into this class and the students. You have made the material approachable and interesting, without it being overwhelming. I am sincerely so thankful to have had such a caring professor who goes above an beyond f...
Wed Mar 08, 2017 11:33 am
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2017
Replies: 183
Views: 20097

### Re: Quiz 3 Winter 2017

andrea mejia wrote:For number 5, how do we know the first step is the slow one?
Also, could someone explain when and how to use iso- in naming? Or just how to do #1?

I was also wondering the same thing. How do we know that the first step is the rate limiting step? Does it have to do with the intermediates in step 1?
Wed Mar 08, 2017 11:24 am
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2017
Replies: 183
Views: 20097

### Re: Quiz 3 Winter 2017

On page 83: electrophilic addition of Hbr to 2-Butene
Could we have the positions of Br and H switched for the final answer?
Wed Feb 22, 2017 11:19 am
Forum: Administrative Questions and Class Announcements
Topic: Quiz 2 Winter 2017
Replies: 160
Views: 17530

### Re: Quiz 2 Winter 2017

andrea mejia wrote:are we going to need to memorize the reaction order equations or will they be given to us on the formula sheet?

I think that we'll be provided with the same formulas as those on the formula sheet.
Wed Feb 22, 2017 11:16 am
Forum: Administrative Questions and Class Announcements
Topic: Quiz 2 Winter 2017
Replies: 160
Views: 17530

### Re: Quiz 2 Prep Winter 2017

For Quiz 2 Prep, how do you answer #1, where it asks to find the rate of formation of NO2 when the rate of decomposition of N2O5 is 2.89 mol/L*s? I believe this should be correct: So the reaction you are given is: N2O5(g) → NO2(g) + O2(g) but it is not balanced. After balancing the reaction, you sh...
Wed Feb 22, 2017 10:59 am
Forum: Administrative Questions and Class Announcements
Topic: Quiz 2 Winter 2017
Replies: 160
Views: 17530

### Re: Quiz 2 Winter 2017

This is a really basic question, but is it fine to switch the sign of a negative rate at the end? So, if my answer is negative, could I just make it positive for full credit, or do I have to set up the equation to get a positive answer from the very beginning?
Mon Feb 13, 2017 12:05 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Homework #14.17
Replies: 1
Views: 332

### Homework #14.17

The question is: Write the balanced half-reactions for the redox reaction of an acidified solution of potassium permanganate and iron (II) chloride. Write the balanced equation for the cell reaction and devise a galvanic cell to study the reaction. I wasn't sure what the half reactions of this looke...
Sun Feb 05, 2017 11:42 pm
Forum: Student Social/Study Group
Topic: Formulas
Replies: 4
Views: 654

### Re: Formulas

Agree with all the comments above. If I'm not mistaken the formulas on the laminated sheet will be the same ones provided to us during exams, so it may be helpful to use the sheet during practice problems as well.
Sun Jan 22, 2017 11:17 pm
Forum: Phase Changes & Related Calculations
Topic: Study Group
Replies: 7
Views: 816

### Re: Study Group

I would love to as well! :)
Sun Jan 15, 2017 4:13 pm
Forum: Student Social/Study Group
Topic: chem 14B workbook
Replies: 7
Views: 1011

### Re: chem 14B workbook

I have also seen people sell their materials (practice quizzes with or without the course reader) on Bruinwalk for a much cheaper cost, so it might be helpful to look there too.