Q: For the reaction $$2\text{O}_3(g) \rightarrow 3\text{O}_2(g)$$, if the rate of appearance of $$\text{O}_2 is$$ $$6.0 \times 10$$^{-5}$$\ \text{M/s}$$, what is the rate of disappearance of $$\text{O}_3$$?

$$4.0 \times 10$$^{-5}$$\ \text{M/s}$$

Q: A reaction is found to be second-order overall. Which of the following could be its rate law?

$$\text{Rate} = k[\text{A}][\text{B}]$$

Question 1

Which of the following factors does NOT generally increase the rate of a chemical reaction?

Accepted Answer

Decreasing the temperature

Question 2

For the reaction $$2	ext{O}_3(g) ightarrow 3	ext{O}_2(g)$$, if the rate of appearance of $$	ext{O}_2 is$$ $$6.0 	imes 10$$^{-5}$$\ 	ext{M/s}$$, what is the rate of disappearance of $$	ext{O}_3$$?

Accepted Answer

$$4.0 	imes 10$$^{-5}$$\ 	ext{M/s}$$

Question 3

Which of the following best describes a catalyst in a chemical reaction?

Accepted Answer

It increases the rate of reaction without being consumed.

Question 4

Given the rate law $$	ext{Rate} = k[	ext{A}][	ext{B}]^2$$, what happens to the rate if $$[	ext{B}] is $$doubled while $$[	ext{A}]$$ remains constant?

Accepted Answer

The rate quadruples.

Question 5

Which of the following is the correct integrated rate law for a first-order reaction?

Accepted Answer

$$\ln [A] = -kt + \ln [A]_0$$

Question 6

A reaction is found to be zero-order with respect to reactant A. Which of the following statements is true?

Accepted Answer

The rate of reaction is independent of $$[A].$$

Question 7

The half-life for a first-order reaction is given by which of the following equations?

Accepted Answer

$$t_{1/2} = \frac{0.693}{k}$$

Question 8

Which experimental method is commonly used to determine the order of a reaction with respect to a particular reactant?

Accepted Answer

Vary the concentration of one reactant while keeping others constant and measure the rate.

Question 9

For a reaction with the rate law $$	ext{Rate} = k[	ext{A}]^2$$, which plot will yield a straight line?

Accepted Answer

$$\frac{1}{[A]} vs. $$time

Question 10

A chemist observes that the rate of a reaction quadruples when the concentration of reactant B is doubled, while the concentration of reactant A is held constant. What is the order of the reaction with respect to B?

Accepted Answer

Second order

Question 11

Which of the following best explains why a fine powder reacts faster than a solid chunk of the same substance?

Accepted Answer

The powder has a greater surface area, allowing more collisions.

Question 12

If the rate law for a reaction is $$	ext{Rate} = k[	ext{A}]^0[	ext{B}]^1$$, what will happen to the rate if $$[	ext{A}] is $$doubled and $$[	ext{B}] is $$tripled?

Accepted Answer

The rate will triple.

Question 13

Which of the following is a correct statement about the rate constant $$k$$?

Accepted Answer

It is dependent on temperature.

Question 14

A reaction has the following rate law: $$	ext{Rate} = k[	ext{A}]^1[	ext{B}]^2. $$What is the overall order of the reaction?

Accepted Answer

Third order

Question 15

Which of the following is true for a first-order reaction?

Accepted Answer

A plot of $$\ln [A]$$ versus time is linear.

Question 16

Which of the following best describes the effect of temperature on reaction rate?

Accepted Answer

Increasing temperature increases the kinetic energy of molecules, leading to more frequent and energetic collisions.

Question 17

For the reaction $$	ext{C}_4	ext{H}_9	ext{Cl} + 	ext{H}_2	ext{O} ightarrow 	ext{C}_4	ext{H}_9	ext{OH} + 	ext{HCl}$$, the rate law is found to be $$	ext{Rate} = k[	ext{C}_4	ext{H}_9	ext{Cl}]. $$What is the order of the reaction with respect to $$	ext{C}_4	ext{H}_9	ext{Cl}$$?

Accepted Answer

First order

Question 18

Which of the following is a correct expression for the average rate of disappearance of reactant A?

Accepted Answer

$$-\frac{\Delta [A]}{\Delta t}$$

Question 19

A reaction is found to be second-order overall. Which of the following could be its rate law?

Accepted Answer

$$	ext{Rate} = k[	ext{A}][	ext{B}]$$

Chemical Kinetics: Rates of Chemical Reactions

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