## Memorization?

ShastaB4C
Posts: 100
Joined: Thu Sep 26, 2019 12:18 am

### Memorization?

Do we have to memorize the integrated rate law formulas for each order or how to derive them?

jisulee1C
Posts: 149
Joined: Thu Jul 25, 2019 12:17 am

### Re: Memorization?

The integrated rate laws are on the constants and equations sheet but you have to know which rate law corresponds to which order reaction. In addition, it also has the half life equations. I think for outline 6 it states that one of the objectives is to ...

Know how to derive the differential and integrated rate laws for zero, 1st and 2nd order reactions and know how to derive their respective half-life equations. 1st Order: - d[A] dt = k [A] ln [A] = -k t + ln [A]o t1/2 = 0.693 k 2nd Order: - d[A] dt = k [A]2 1 [A] = k t + 1 [A]o t1/2 = 1 k [A]o Zero Order: - d[A] dt = k [A] = - k t + [A]0 t1/2 = [A]o 2 k

so I would look over how to derive but don't worry about memorizing them!

Ryan Chang 1C
Posts: 105
Joined: Sat Aug 24, 2019 12:17 am

### Re: Memorization?

There are other forms of these equations that may be helpful to memorize because they don't appear on the formula sheet.

One example is ln(k1/k2) = Ea/R[(1/T2)-(1/T1)]

ShastaB4C
Posts: 100
Joined: Thu Sep 26, 2019 12:18 am

### Re: Memorization?

So derivations may come in handy based on the information given?

Jessica Chen 2C
Posts: 103
Joined: Thu Jul 11, 2019 12:17 am

### Re: Memorization?

Yes, it would be useful to be able to derive, we might need it to solve a problem.