AP Chemistry : Integrated Rate Laws

Study concepts, example questions & explanations for AP Chemistry

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Example Questions

Example Question #621 : Ap Chemistry

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?

Possible Answers:

44.4 second

253 second

88.8 seconds

22.2 seconds

11.1 seconds

Correct answer:

22.2 seconds

Explanation:

 

Example Question #622 : Ap Chemistry

02

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

Possible Answers:

Zero Order

Third Order

First order

Second Order

Squared Order

Correct answer:

First order

Explanation:

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

Example Question #623 : Ap Chemistry

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?

Possible Answers:

198 minutes

145 minutes

65 minutes

180 minutes

120 minutes

Correct answer:

145 minutes

Explanation:

 

 

Example Question #1 : 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?

Possible Answers:

0.0614 seconds

0.0314 seconds

0.0729 second

0.0582 seconds

0.132 seconds

Correct answer:

0.0729 second

Explanation:

Example Question #2 : Integrated Rate Laws

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

Possible Answers:

0.52

0.21

1.5

0.46

0.75

Correct answer:

0.46

Explanation:

 

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