1. What is the half-life for a particular reaction if the rate law is rate = (1301 min)[A]?

2. Consider the radioisotope U (half life = 7.04 10 years). What is the first order rate constant for U?

3. What is the concentration of a reactant after 22.0 s if the initial concentration is 0.150 M and the rate constant is 5.4 x 10 s?

4. A first-order reaction initially contains 1.00 10 molecules. If the reaction has a half-life of 20.0 minutes, how many molecules remain unreacted after 80.0 minutes?

5. How long will it take for the concentration of A to decrease from 0.500 M to 0.200 M in the first-order reaction A B? (k = 0.800 s)

6. A substance decomposes with a rate constant of 9.05 10 s. How long does it take for 15.0% of the substance to decompose?

7. What is the effect on k as the activation energy for a reaction increases? A) Increases B) Decreases C) Stays the same D) Not enough info

8. Identify which of the following changes will result in a change in the value of the rate constant for the reaction 2 A products.

A) Increasing the concentration of A

B) Decreasing the concentration of A

C) Increasing the temperature of the reaction

D) Allowing the reaction to reach equilibrium

E) Increasing the pressure