Question 1

Which of the following best describes the units of the rate constant $$k$$ for a second-order reaction?

Accepted Answer

$$\mathrm{M}^{-1} \ s$$^{-1}$$

Question 2

For the reaction $$A + B ightarrow C$$, the rate law is $$	ext{rate} = k[A][B]. $$What are the units of $$k$$?

Accepted Answer

$$\mathrm{M}^{-1} \ s$$^{-1}$$

Question 3

A zero-order reaction has a rate law $$	ext{rate} = k. $$What are the units of $$k$$ for this reaction?

Accepted Answer

$$\mathrm{M} \ s$$^{-1}$$

Question 4

In the enzyme-catalyzed reaction $$E + S \underset{k_{-1}}{\overset{k_1$}{\rightleftharpoons}} ES \overset{k_2$}{\rightarrow} E + P$$, what are the units of $$k_2$$?

Accepted Answer

$$s^{-1}$$

Question 5

Given the rate law $$	ext{rate} = k[E][S]$$ for the formation of ES in an enzyme-catalyzed reaction, what is the overall order of the reaction?

Accepted Answer

Second order

Question 6

If the rate constant $$k$$ for a reaction has units of $$s^{-1}$$, what is the most likely order of the reaction?

Accepted Answer

First order

Question 7

For the breakdown of ES to E + S in the enzyme-catalyzed reaction, the rate law is $$	ext{rate} = k_{-1}[ES]. $$What are the units of $$k_{-1}$$?

Accepted Answer

$$s^{-1}$$

Question 8

A reaction has the rate law $$	ext{rate} = k[A]^2. If $$the units of rate are $$\mathrm{M} \ s$$^{-1}$$, what are the units of k$?

Accepted Answer

$$\mathrm{M}^{-1} \ s$$^{-1}$$

Question 9

Which of the following statements is TRUE regarding the sum of exponents in a rate law?

Accepted Answer

The sum of the exponents equals the overall reaction order.

Question 10

In a reaction where $$	ext{rate} = k[A][B]$$, doubling the concentration of both $$A$$ and $$B$$ will increase the rate by what factor?

Accepted Answer

Four

Question 11

If a reaction is third order overall, which of the following could be the units of its rate constant $$k$$?

Accepted Answer

$$\mathrm{M}^{-2} \ s$$^{-1}$$

Question 12

Which of the following best explains why the units of the rate constant $$k$$ change with reaction order?

Accepted Answer

The units of $$k$$ must compensate for the concentration terms in the rate law to yield units of $$\mathrm{M} \ s$$^{-1}$$ for rate.

Question 13

For the enzyme-catalyzed reaction $$E + S \underset{k_{-1}}{\overset{k_1$}{\rightleftharpoons}} ES \overset{k_2$}{\rightarrow} E + P$$, which rate constant describes the breakdown of ES to E + P?

Accepted Answer

$$k_2$$

Question 14

A student claims that for any reaction, the units of the rate constant $$k$$ are always $$s^{-1}. Is $$this correct?

Accepted Answer

No, the units of $$k$$ depend on the overall reaction order.

Question 15

If the rate law for a reaction is $$	ext{rate} = k[A]$$, and the rate constant $$k is $$measured as $$0.5 \ s$$^{-1}$$, what is the order of the reaction?

Accepted Answer

First order

Rate Constant Units and Enzyme Kinetics

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