# AP Chemistry : Integrated Rate Laws

## Example Questions

### Example Question #1 : Integrated Rate Laws

The rate constant for a second-order reaction is 0.15 M-1s-1.  If the initial concentration of the reactant is 0.30 M, how long does it take for the concentration to decrease to 0.15 M?

253 second

44.4 second

88.8 seconds

22.2 seconds

11.1 seconds

22.2 seconds

Explanation:

### Example Question #1 : Integrated Rate Laws

Based on the figure above, what is the order of reaction?

Third Order

First order

Squared Order

Zero Order

Second Order

First order

Explanation:

For a first order reaction, the ln [A]t is linear with t.

### Example Question #111 : Thermochemistry And Kinetics

A compound decomposes by a first-order process.  If 25.0% of the compound decomposes in 60 minutes, the half-life of the compound is?

145 minutes

120 minutes

198 minutes

180 minutes

65 minutes

145 minutes

Explanation:

### Example Question #4 : Integrated Rate Laws

Cyclopentane is unstable and decomposes by a first order reaction.  The rate constant for this reaction is 9.5 s-1.  What is the half life of the reaction?

0.132 seconds

0.0729 second

0.0582 seconds

0.0314 seconds

0.0614 seconds

0.0729 second

Explanation:

### Example Question #1 : Integrated Rate Laws

The half life of a first order reaction is 1.5 hours.  What is the rate constant of this reaction?

1.5

0.52

0.21

0.46

0.75