CHEMISTRY COMMUNITY

Sarah_Kremer_1A

tert-butyl is a special substituent that Dr. Lavelle mentioned in his lecture -- it generally looks like a plus sign (+). The tert and the butyl go together. I don't think he ever explained how it is named, just that tert-butyl is a substituent that we should know.

Sarah_Kremer_1A

The slope of the line on the graph is equal to -Ea/R. Since R is a constant and you can find the slope using the data points, you can then find Ea.

Sarah_Kremer_1A

The normal approach is used when the first step is the slow step (normally given). The pre-equilibrium approach is used when the second step is the slow step (also normally given).

Sarah_Kremer_1A

I think 4B is separate from 4A, which is why you don't use n=2. They aren't the same question, and use different chemicals. As for how they found n=1, I'm not sure!

Sarah_Kremer_1A

F= 96485, not 964853! You have an extra number in there. If you use the correct value for F, you should get the right number.

Sarah_Kremer_1A

the temperature should be in kelvin, since other constants use kelvin.

Sarah_Kremer_1A

Furthermore, the substituents generally have equatorial (horizontal) bonds while the hydrogens have axial bonds.

Sarah_Kremer_1A

Arshia_Sabir_3E wrote:Can someone please help me with #3? I used the integrated rate law for first order and I got t=205 seconds

For #3, it is a first order reaction, so you use the corresponding equation
ln[A] = -kt + ln[A0]
so, ln(.33) = -(.0068)t + ln(.75)
ln(.33/.75) = -.0068t
t = ln(.33/.75)/-.0068
t = 120 sec

Sarah_Kremer_1A

Hi, I was wondering where the video of the midterm review session is posted? I can't seem to find it.
Thank you!

Sarah_Kremer_1A

Will we have to know how to derive the equations we derived in class for the quiz?

Sarah_Kremer_1A

On Friday in class Prof Lavelle introdued the equation w=-nRT(vf/vi). You use this equation in this instance since the pressure is not constant and becuase it is a reversible reaction. Those are the conditions for using this equation. If you use this equation, you should get the correct answer.

Sarah_Kremer_1A

It depends on the information given in the problem. For example, if bond constants are given, then you should use that method to solve the problem.

Sarah_Kremer_1A

And this only applies to polyprotic acids, since they have more than one K values

Sarah_Kremer_1A

Will the final exam equally cover all topics covered in the course? Or will the questions be more about material after the midterm?

Sarah_Kremer_1A

and will we need to know how many bonds they form and their charges? i have a feeling yes, but there isn't a specific table i can find with that information...

Sarah_Kremer_1A

Also, in the case of atoms attached to a ring structure, the polarity differs. For example, if there is a ring structure, and there is a chlorine attached to carbon atoms directly across from one another, the dipole moments cancel and the molecule is non polar. However, if the chlorine atoms are not...

Sarah_Kremer_1A

I think we should know the general shape of the molecule - such as what a tetrahedral looks like - but we don't need to be able to draw it. He just wants us to be able to take a molecule and state its shape, without any picture or specifics.

Sarah_Kremer_1A

What do you call a clown who is in jail?
A silicon.

Sarah_Kremer_1A

I asked Dr. Lavelle and he said that as we come across different compounds, that we should learn those. As they are introduced we should become responsible for them.

Sarah_Kremer_1A

I am in Canyon Point A1 and I would like to sometimes join! Some group studying might be beneficial closer to midterms

Sarah_Kremer_1A

I have the same problem! I haven't taken Chemistry since my sophomore year in high school. I found working through ALL of the fundamental homework problems to be very beneficial. It triggered my memory of some concepts I learned in high school and also reminded me of concepts that I had struggled wi...

CHEMISTRY COMMUNITY

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