CHEMISTRY COMMUNITY

Mana_Sheykhsoltan_1A

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?

Mana_Sheykhsoltan_1A

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!

Mana_Sheykhsoltan_1A

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!

Mana_Sheykhsoltan_1A

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...

Mana_Sheykhsoltan_1A

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...

Mana_Sheykhsoltan_1A

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 ...

Mana_Sheykhsoltan_1A

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...

Mana_Sheykhsoltan_1A

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 ...

Mana_Sheykhsoltan_1A

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 ...

Mana_Sheykhsoltan_1A

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 ...

Mana_Sheykhsoltan_1A

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!

Mana_Sheykhsoltan_1A

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

CHEMISTRY COMMUNITY

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Re: When to use Z vs. E?

Re: Organic Reaction Mechanism [ENDORSED]

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