Question 1

Given the reaction $$2A + 2B + C \rightarrow D + 3E$$, and the experimental data provided, what is the order of the reaction with respect to $$[A]$$?

Accepted Answer

First order

Question 2

Which of the following statements best describes the effect of a catalyst on a chemical reaction?

Accepted Answer

A catalyst lowers the activation energy and is not consumed in the reaction.

Question 3

For a reaction that is first order in $$[A]$$, which plot will yield a straight line?

Accepted Answer

$$\ln[A] vs$$. $$t$$

Question 4

If the rate law for a reaction is $$	ext{Rate} = k[A][B]^2$$, what are the units of the rate constant $$k$$?

Accepted Answer

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

Question 5

According to collision theory, which of the following is NOT required for a successful reaction?

Accepted Answer

Reactant molecules must collide frequently.

Question 6

A reaction is found to be zero order in $$[A]. If $$the initial concentration of $$A is $$doubled, what happens to the rate?

Accepted Answer

The rate remains the same.

Question 7

Which of the following best describes the rate-determining step in a reaction mechanism?

Accepted Answer

It is the slowest step and determines the overall reaction rate.

Question 8

For the reaction $$A + 2B ightarrow C$$, the rate law is found to be $$	ext{Rate} = k[A][B]. If$$ $$[A] is $$doubled and $$[B] is $$tripled, by what factor does the rate increase?

Accepted Answer

6

Question 9

Which of the following is true about the units of the rate constant $$k$$ for a second-order reaction?

Accepted Answer

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

Question 10

The Arrhenius equation relates the rate constant $$k to $$temperature $$T. $$Which of the following correctly represents the Arrhenius equation?

Accepted Answer

$$k = Ae$$^{-E_a/RT}$$

Question 11

A reaction has a rate law $$	ext{Rate} = k[A]^2. If $$the initial concentration of $$A is $$decreased from $$0.10\ M to$$ $$0.05\ M$$, how does the rate change?

Accepted Answer

The rate is quartered.

Question 12

Which of the following is a characteristic of a termolecular elementary step?

Accepted Answer

It involves three reactant molecules colliding simultaneously.

Question 13

Which of the following statements about the transition state is correct?

Accepted Answer

It is a short-lived, high-energy state where bonds are partially broken and formed.

Question 14

If a reaction is first order in $$[A]$$ and zero order in $$[B]$$, what is the overall order of the reaction?

Accepted Answer

First order

Question 15

Which of the following best explains why the rate law for a reaction cannot generally be determined from the stoichiometry of the overall reaction?

Accepted Answer

The rate law depends on the mechanism, not just the overall reaction.

Question 16

A catalyst in the same phase as the reactants is called:

Accepted Answer

A homogenous catalyst

Question 17

Which of the following changes will NOT affect the rate of a chemical reaction?

Accepted Answer

Increasing the volume of the container for a reaction in solution

Question 18

For a reaction with the rate law $$	ext{Rate} = k[A][B]$$, what is the overall order of the reaction?

Accepted Answer

Second order

Question 19

Which of the following is true about the rate constant $$k$$ for a first-order reaction?

Accepted Answer

It has units of $$s^{-1}$$

Question 20

In a reaction mechanism, which step determines the rate law for the overall reaction?

Accepted Answer

The slowest (rate-determining) step

Chemical Kinetics: Reaction Rates, Mechanisms, and Rate Laws

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