Search found 12 matches

by Mana_Sheykhsoltan_1A
Sat Mar 18, 2017 12:51 am
Forum: *Cycloalkenes
Topic: When to use Z vs. E?
Replies: 4
Views: 1195

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?
by Mana_Sheykhsoltan_1A
Sun Mar 12, 2017 1:42 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Organic Reaction Mechanism [ENDORSED]
Replies: 2
Views: 402

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!
by Mana_Sheykhsoltan_1A
Sun Mar 12, 2017 1:36 pm
Forum: *Alkanes
Topic: Priority
Replies: 2
Views: 323

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!
by Mana_Sheykhsoltan_1A
Sun Mar 05, 2017 3:58 pm
Forum: *Cycloalkanes
Topic: Common Names
Replies: 3
Views: 497

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...
by Mana_Sheykhsoltan_1A
Sun Feb 26, 2017 2:02 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Slow Reaction
Replies: 11
Views: 924

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...
by Mana_Sheykhsoltan_1A
Sun Feb 19, 2017 12:04 pm
Forum: General Rate Laws
Topic: Chapter 15 question 15
Replies: 1
Views: 326

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 ...
by Mana_Sheykhsoltan_1A
Sun Feb 12, 2017 12:43 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Winter 2013 Midterm Q7
Replies: 2
Views: 433

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...
by Mana_Sheykhsoltan_1A
Sun Feb 05, 2017 12:59 am
Forum: Balancing Redox Reactions
Topic: Cell diagram
Replies: 3
Views: 593

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 ...
by Mana_Sheykhsoltan_1A
Sun Jan 29, 2017 1:23 am
Forum: Administrative Questions and Class Announcements
Topic: Quiz Preparation
Replies: 3
Views: 607

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 ...
by Mana_Sheykhsoltan_1A
Sat Jan 21, 2017 8:34 pm
Forum: Phase Changes & Related Calculations
Topic: Constant P vs Constant V Calorimetry [ENDORSED]
Replies: 4
Views: 649

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 ...
by Mana_Sheykhsoltan_1A
Sun Jan 15, 2017 11:47 pm
Forum: Phase Changes & Related Calculations
Topic: Most Helpful Resource
Replies: 14
Views: 1639

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!
by Mana_Sheykhsoltan_1A
Sat Jan 14, 2017 1:01 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8039
Views: 1410259

Re: Post All Chemistry Jokes Here

Q: What did the element say to the police?
A: I CU copper

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