Search found 10 matches

by Mackenzie Sober 2E
Sun Mar 19, 2017 10:12 am
Forum: *Cycloalkanes
Topic: Final 2013 Q6 - Numbering
Replies: 3
Views: 524

Re: Final 2013 Q6 - Numbering

Hi everyone! Can anyone explain why the methyls of the cyclohexane in Question 6A of the 2013 Final are numbered 1,5,5,6 and not 1,2,3,3? It's because you have a double bond. When you have a double or a triple bond, you must count going across across the bond. You started at the double bond, but th...
by Mackenzie Sober 2E
Tue Mar 14, 2017 9:05 pm
Forum: *Cyclopropanes and Cyclobutanes
Topic: Common Occurrence
Replies: 1
Views: 466

Common Occurrence

Cyclopropane and cyclobutane molecules are not commonly found, does that just mean that once they are formed they are more likely to immediately bond with some other molecule?
by Mackenzie Sober 2E
Sun Mar 05, 2017 2:13 pm
Forum: *Cycloalkenes
Topic: 2 Substituents on a Ring
Replies: 2
Views: 447

2 Substituents on a Ring

The course reader says for 2 Substituents on a ring, if the substituent numbers are the same, the 1st named group gets the lower number. If there are only 2 substituents, won't they always have the same number? If this is not correct, can someone please give an example of when they would not have th...
by Mackenzie Sober 2E
Sat Feb 25, 2017 9:45 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Proposed Structure
Replies: 1
Views: 165

Proposed Structure

In the homework, problem 85 asks about drawing proposed structures for activated complexes, we didn't cover any of it in class, so do we need to know how to draw these?
by Mackenzie Sober 2E
Sat Feb 18, 2017 10:52 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Steady State Approach [ENDORSED]
Replies: 3
Views: 441

Steady State Approach [ENDORSED]

Since we didn't really cover it in class, should we only know that the Steady State approach and the Pre-Equilibrium approach give the same result but the Pre-Equilibrium approach is less flexible or is there more we should know about Steady State?
by Mackenzie Sober 2E
Sun Feb 12, 2017 1:22 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: kJ or kJ/mol?
Replies: 2
Views: 220

kJ or kJ/mol?

Yesterday in one of the review sessions the TA said something about how delta G should always be reported as kJ per mole of reaction. I thought we were only supposed to include per mole if the question specifically states per mole. Can someone please clarify?
by Mackenzie Sober 2E
Sun Feb 05, 2017 9:31 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Spontaneity
Replies: 1
Views: 189

Spontaneity

If Standard E is a large negative does it mean the reaction is unfavorable and won't occur spontaneously or is it the other way around?
by Mackenzie Sober 2E
Sat Jan 28, 2017 8:48 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Molar Kinetic Energy
Replies: 1
Views: 241

Molar Kinetic Energy

When calculating the molar kinetic energy using Utot=3/2RT, which R do we use?
by Mackenzie Sober 2E
Sat Jan 21, 2017 7:48 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Gas Expansion Example [ENDORSED]
Replies: 1
Views: 242

Gas Expansion Example [ENDORSED]

For the gas expansion example on page 30 of the course reader, in class Dr. Lavelle said the expansion has to happen slowly, why is this? What happens if the expansion happens quickly?
by Mackenzie Sober 2E
Sat Jan 14, 2017 9:22 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Internal Energy
Replies: 1
Views: 144

Internal Energy

Section 8.2 in the book states you cannot calculate the absolute internal energy of a system because it would include all the energies of the atoms, their electrons etc. Why is this? Is there simply infinitely too many tiny parts to the system to calculate?

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