Search found 12 matches
- Sat Mar 18, 2017 12:51 am
- Forum: *Cycloalkenes
- Topic: When to use Z vs. E?
- Replies: 4
- Views: 1979
Re: When to use Z vs. E?
What if two substituents are on one side and one subsistent is on the other side? Would it be cis or trans? I understand when you are only looking at two substituents, but how do you differentiate cis from trans when there are more than two substituents?
- Sun Mar 12, 2017 1:42 pm
- Forum: *Organic Reaction Mechanisms in General
- Topic: Organic Reaction Mechanism [ENDORSED]
- Replies: 2
- Views: 624
Re: Organic Reaction Mechanism [ENDORSED]
Page 154 in the organic chemistry textbook states that "reactions with activation energies below 80 kJ/mol can occur at room temperature, while those with larger activation energies require energy input to occur." Hope this helps!
Re: Priority
Professor Lavelle mentioned in lecture that the problems will not have more than one functional group; however, functional groups are given priority over substituents so you need to know how to compare the two. Hope this helps!
- Sun Mar 05, 2017 3:58 pm
- Forum: *Cycloalkanes
- Topic: Common Names
- Replies: 3
- Views: 776
Re: Common Names
I think the prefix iso- is used when you see the structural pattern (CH3)2CH (two CH3 molecules are attached to the carbon of CH). The prefix neo- is used when you see the structural pattern (CH3)3C (three CH3 molecules are attached to a carbon). Iso- and neo- are structural identifiers and are part...
- Sun Feb 26, 2017 2:02 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Slow Reaction
- Replies: 11
- Views: 1908
Re: Slow Reaction
I think Professor Lavelle mentioned in Friday's lecture how the question will explicitly state which step is slow and which is fast or k, the rate constant, for each step will be given to you. By comparing the rate constants of the two steps, you can determine which step is faster and which is slowe...
- Sun Feb 19, 2017 12:04 pm
- Forum: General Rate Laws
- Topic: Chapter 15 question 15
- Replies: 1
- Views: 452
Re: Chapter 15 question 15
I thought of it as for OH: f^a = (2.0)^a = 2 so a=1 and it's first order. Similarly, for CH3Br: f^b = (1.2)^b = 1.2 so b=1 and it's first order. Thus, the rate is first order for both reactants. Setting up an expression would also allow you to solve more complex problems. If the concentration of OH ...
- Sun Feb 12, 2017 12:43 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Winter 2013 Midterm Q7
- Replies: 2
- Views: 583
Re: Winter 2013 Midterm Q7
I found K by using lnK=(nE(cell))/(0.025693 V) and got the same answer as the course reader did, 1.0 x 10^-71. When I used delta(G)=-RTlnK, I got the same answer as you did, K=1.35 x 10^-72. I used the values delta(G)=4.1 x 10^5 J/mol, R=8.314 J/(K mol), T=298 K. I think the course reader may be wro...
- Sun Feb 05, 2017 12:59 am
- Forum: Balancing Redox Reactions
- Topic: Cell diagram
- Replies: 3
- Views: 1988
Re: Cell diagram
I think translating the short-hand symbols into an actual drawing could be a possible question. However, I think we would more likely be asked to write the cell diagram (to write the short-hand symbols) when given the oxidation and reduction equations, as question 7C on the Winter 2014 Midterm asks ...
- Sun Jan 29, 2017 1:23 am
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz Preparation
- Replies: 2
- Views: 870
Re: Quiz Preparation
The answers to the quiz preparations are not provided. My TA did not go over the quiz questions, whereas others did in their discussions. I think the quiz preparations are designed for us to solve the problems on our own, without having the answers. Since we are provided the answers to the homework ...
- Sat Jan 21, 2017 8:34 pm
- Forum: Phase Changes & Related Calculations
- Topic: Constant P vs Constant V Calorimetry [ENDORSED]
- Replies: 4
- Views: 1084
Re: Constant P vs Constant V Calorimetry [ENDORSED]
Also, bomb calorimeters indicate a fixed volume. To clarify the distinction between the heat capacities: the constant-volume and constant-pressure heat capacities of solid and liquid substances are similar; however, gases expand more quickly and thus more energy is lost as work when a gas is heated ...
- Sun Jan 15, 2017 11:47 pm
- Forum: Phase Changes & Related Calculations
- Topic: Most Helpful Resource
- Replies: 14
- Views: 2456
Re: Most Helpful Resource
I find it helpful to read the book first. I like to take notes while reading so I have a greater tendency to retain the information. I then go over the course reader notes and do the assigned problems. Afterwards, I do practice problems, such as the quiz problems in the course reader. Hope this helps!
- Sat Jan 14, 2017 1:01 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2996504
Re: Post All Chemistry Jokes Here
Q: What did the element say to the police?
A: I CU copper
A: I CU copper