Search found 17 matches

by James C
Sun Mar 16, 2014 11:30 am
Forum: *Alkanes
Topic: 2013 6A
Replies: 2
Views: 537

Re: 2013 6b

by James C
Sun Mar 16, 2014 12:22 am
Forum: Method of Initial Rates (To Determine n and k)
Topic: Final 2011 4d
Replies: 6
Views: 794

Re: Final 2011 4d

ch1995 wrote:Sorry, I wasn't sure how to type the superscript using the equation function thing... but I fixed it, I meant for n-1 to be in the exponent :)


But then isn't a number to an exponent of zero power equal to one?
by James C
Sat Mar 15, 2014 11:49 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Final 2011 4d
Replies: 6
Views: 794

Re: Final 2011 4d

WAIT! But in the integrated rate law for the problem, the exponent is n-1 !
by James C
Sat Mar 15, 2014 11:39 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Final 2012 2C
Replies: 1
Views: 361

Final 2012 2C

The safe filled with He from Part A is first heated up to 100 degrees celcius and then leaks. Calculate the He change in entropy associated with heating, as well as for the overall process (both He heating and expansion).

How do we know to use Cv instead of Cp?
by James C
Sat Mar 15, 2014 11:35 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Final 2011 4d
Replies: 6
Views: 794

Final 2011 4d

For which values of n is the given integrated rate law NOT valid?

n=1

Why is the answer n=1???
by James C
Sat Mar 15, 2014 9:53 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: 2012 Q8A
Replies: 2
Views: 661

Re: 2012 Q8A

It may be difficult to visualize, but the dihedral angle the question is referring to 120 degrees between the Iodo, Carbon, Carbon, Carbon Bond. Try using your model kit! Since we know there is a methyl group attached to the second carbon, an eclipsed conformation would give us the ICCC dihedral ang...
by James C
Sat Mar 15, 2014 9:49 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 2012 final Q3 (c)
Replies: 2
Views: 431

Re: 2012 final Q3 (c)

You want to be as specific as possible! Since the question gave you exact molarities, you should include them in the cell diagram.
by James C
Sat Mar 15, 2014 9:47 pm
Forum: *Alkanes
Topic: 2012 final Q6B last subquestion
Replies: 2
Views: 1403

Re: 2012 final Q6B last subquestion

Think about it conceptually. If there is CH3 in the shortened name we know that the hydrocarbon has to be an end piece. Since there are 4 (CH3CH2CH2), it would make sense for Carbon to be in the middle and have each (CH3CH2CH2) bond to it. This should help you draw out a lewis structure and help wit...
by James C
Sat Mar 15, 2014 9:44 pm
Forum: *Cycloalkenes
Topic: Final 2013 6a Numbering a hexene
Replies: 8
Views: 2263

Re: Final 2013 6a

Think about it like this: You always want to give the double bond the SMALLEST number. I know, it might be tempting to say that 2,3,4,4, sounds better because it gives the appearance of lower numbers, but 1,5,5,6 gives the LOWEST number to the first carbon carbon double bond. 1<2.
by James C
Sat Mar 15, 2014 9:01 pm
Forum: *Cycloalkanes
Topic: 2012 Final Q6B
Replies: 3
Views: 676

Re: 2012 Final Q6B

I believe its because since they are only common names, (not functional groups or alkene, alkyene structures), you treat them as you would any hydrocarbon group. I.e. numbering them alphabetically. "I" in iso comes before "N" neo
by James C
Sat Mar 15, 2014 8:57 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Final 2012 6B
Replies: 6
Views: 776

Re: Final 2012 6B

@ychem

Thanks!
by James C
Sat Mar 15, 2014 8:57 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Final 2012 6B
Replies: 6
Views: 776

Re: Final 2012 6B

I thought you listed cis or trans for double bond and cyclic structures?
by James C
Sat Mar 15, 2014 8:48 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Final 2012 6B
Replies: 6
Views: 776

Final 2012 6B

Question 6B on Winter 2012 Final Exam states:

"Name the following organic compounds."

The solution guide reads: 1-isopropyl-3-neopentylcyclohexane (for the first molecule)

If the organic molecule contains a cyclohexane, why do we not designate cis or trans for the compound?
by James C
Tue Mar 11, 2014 12:02 am
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Final Winter 2009, Question 7A
Replies: 1
Views: 476

Final Winter 2009, Question 7A

Question 7A on Winter 2009 Final Exam states: "2-(3,4-Dihydroxyphenyl)-3,5,7-trihydroxy-4H-chromen-4-one is commonly called quercetin and is an immune-boosting antioxidant found in grapes, blueberries, and broccoli. Name two functional groups present in the structures of quercetin." How co...
by James C
Tue Feb 25, 2014 12:44 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: 14.91
Replies: 1
Views: 431

14.91

What is rapid equilibrium in the context of this problem? The solutions state the second step is the slow state? How do we know that? Are we suppose to make assumptions? Someone help please!!! The rate law of the reaction 2 NO(g) --> 2 H2(g) + N2(g) 2 H2O(g) is Rate = k[NO]2[H2], and the mechanism t...

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