Q: For the reaction $$2\text{O}_3(g) \rightarrow 3\text{O}_2(g)$$, if ozone is disappearing at a rate of $$4.0 \times 10$$^{-5}$$ \text{M/s}$$, at what rate is oxygen appearing?

$$6.0 \times 10$$^{-5}$$ \text{M/s}$$

Question 1

Which of the following statements best describes the effect of increasing the surface area of a solid reactant on the reaction rate?

Accepted Answer

It increases the reaction rate because more reactant particles are exposed for collisions.

Question 2

A reaction is found to have the rate law $$	ext{Rate} = k[	ext{A}]^2. $$What is the order of the reaction?

Accepted Answer

Second order

Question 3

Which factor does NOT affect the rate of a chemical reaction?

Accepted Answer

Color of the reactants

Question 4

For the reaction $$2	ext{O}_3(g) ightarrow 3	ext{O}_2(g)$$, if ozone is disappearing at a rate of $$4.0 	imes 10$$^{-5}$$ 	ext{M/s}$$, at what rate is oxygen appearing?

Accepted Answer

$$6.0 	imes 10$$^{-5}$$ 	ext{M/s}$$

Question 5

Which of the following is true about a catalyst in a chemical reaction?

Accepted Answer

It provides an alternative mechanism with lower activation energy.

Question 6

The rate law for a reaction is found to be $$	ext{Rate} = k[	ext{NH}_4^+][	ext{NO}_2^-]. If $$the concentration of $$	ext{NH}_4^+ is $$doubled while $$	ext{NO}_2^-$$ remains constant, what happens to the rate?

Accepted Answer

It doubles.

Question 7

Which of the following best describes the transition state in a chemical reaction?

Accepted Answer

It is the highest energy arrangement of atoms along the reaction pathway.

Question 8

For a first-order reaction, which equation correctly relates the concentration of reactant A to time?

Accepted Answer

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

Question 9

Which statement about reaction mechanisms is correct?

Accepted Answer

The overall reaction cannot occur faster than the slowest step.

Question 10

What is the half-life ($$t_{1/2}) $$for a first-order reaction in terms of the rate constant $$k$$?

Accepted Answer

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

Question 11

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

Accepted Answer

It increases as temperature increases.

Question 12

A reaction has the rate law $$	ext{Rate} = k[	ext{A}]. If $$the initial concentration of A is $$0.50\ 	ext{M}$$ and after $$10$$ minutes it is $$0.25\ 	ext{M}$$, what is the half-life of the reaction?

Accepted Answer

10 minutes

Question 13

Which of the following is NOT a requirement for a plausible reaction mechanism?

Accepted Answer

All steps must be termolecular.

Question 14

Which of the following best explains why termolecular elementary steps are rare?

Accepted Answer

They require three molecules to collide simultaneously with the correct orientation and energy.

Question 15

Which equation represents the Arrhenius equation relating the rate constant $$k to $$activation energy $$E_a$$ and temperature $$T$$?

Accepted Answer

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

Question 16

In a zero-order reaction, how does the concentration of reactant change with time?

Accepted Answer

It decreases linearly with time.

Question 17

Which of the following is true about enzymes?

Accepted Answer

They have an active site where substrates bind.

Question 18

For a second-order reaction, which integrated rate law is correct?

Accepted Answer

$$1/[A] = kt + 1/[A]_0$$

Question 19

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

Accepted Answer

Increasing temperature increases the kinetic energy and frequency of collisions, thus increasing the reaction rate.

Question 20

Which of the following is NOT a type of catalyst discussed in chemical kinetics?

Accepted Answer

Isomeric catalyst

Chemical Kinetics: Chapter 14 Study Notes

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