Kinetics | Practice Test / Quiz / MCQs

1. The units of the rate constant (k) for a reaction that occurs between two second-order reactants is:

sec?1L3 mol−3 sec−1L4 mol?4 sec?1L2 mol?2 sec?1L mol?1 sec?1

2. Properties of a catalyst include all of the following except:

Catalysts speed up chemical reactions by providing an alternate pathway for reaction in which the activated complex is of lower energy.A catalyst that works for one chemical reaction may not work for a different reaction.A catalyst will only speed up a chemical reaction in either the forward or reverse direction.A catalyst is not consumed by the reaction it catalyzes.Catalysts can be solids or gases.

3. The conversion of ozone, 2 O3 (g) → 3 O2 (g), obeys the rate law, rate = k [O3]2[O2]−1. Which of the following statements is true regarding the rate of the breakdown of ozone (O3) into molecular oxygen (O2)?

There is an inverse square relationship between ozone and oxygen concentrations.The conversion of oxygen to ozone is faster than the conversion of ozone to oxygen.The negative reactant order of oxygen indicates that the reaction is at equilibrium and the forward reaction is more favorable.The rate at which ozone is converted to oxygen increases as the concentration of oxygen decreases.The catalyst that converts ozone to oxygen is inhibited by oxygen.

4. All of the following result in an increased rate of reaction in an aqueous solution except:

Increasing the temperature of an exothermic reaction.Increasing the temperature of an endothermic reaction.Increasing the surface area of a solid reactant.Increasing the pressure on the solution.Mixing or stirring the solution.

5. Doubling the concentration of M and N increases the reaction rate by eight fold. Halving the concentration of N decreases the reaction rate four fold.

Rate = k [N]2Rate = k [M]Rate = k [M][N]Rate = k [M]2[N]2Rate = k [M][N]2

6. Factors that affect the rate at which a chemical reaction proceeds include which of the following? I. The orientation of the reactants at time of collision II. The kinetic energy of the collisions between reactants III. The frequency of collisions between reactants

I and II onlyII onlyI onlyI, II, and IIIIII only

7. The reaction of nitric oxide with hydrogen gas at 25°C and 1 atm is represented below. The rate law for this reaction is: rate = k [H2][NO]2. According to the rate law, which of the following is the best prediction of the rate of this reaction?

The rate of disappearance of NO is always four times as great as the disappearance of H2.The rate of disappearance of NO is twice as great as the disappearance of H2 if the concentration of NO is initially twice that of H2.The rate of disappearance of NO is always twice as great as the disappearance of H2.The relative disappearances of NO and H2 cannot be deduced without the value of the rate constant (k).The rate of disappearance of NO is four times as fast as that of H2, but only if the initial concentration of NO is initially twice that of H2.

8. The reaction between nitrogen dioxide and carbon monoxide is represented above. The proposed reaction mechanism is as follows: Which of the following reaction mechanisms is consistent with the proposed mechanism?

Rate = k [NO2]2Rate = k [NO][CO]Rate = k [NO2]Rate = k [CO]Rate = k [NO]2[CO]

10. Which of the following can be used to calculate or measure the rate of a chemical reaction? I. The appearance of product over time II. The disappearance of one or more substrates over time III. The rate law IV. The Keq (equilibrium constant) and Q (reaction quotient) of the reaction

I, II, III, and IVI and II onlyI, II, and IV onlyI and III onlyI, II, and III only

11. All of the following statements regarding the kinetics of radioactive decay are true except:

The half-life of an atom does not change when the atom is incorporated into a compound.In a sample of a pure, radioactive isotope, one-half the number of radioactive atoms and one-half the mass of the radioactive substance remains after one half-life.The length of time of a half-life is specific to a particular element.The half-life of a particular substance does not change with time or temperature.All radioactive decay displays first-order kinetics.

12. Which of the following correctly explain(s) the effect of increased temperature on the rate of a chemical reaction? I. Increases the reaction rate of endothermic reactions II. Increases the reaction rate of exothermic reactions III. Decreases the reaction rate of reactions with a –ΔH

I onlyI and II onlyII onlyII and III onlyI and III only

13. All of the following statements regarding the activated complex are true except:

The energy of the activated complex determines the activation energy of the reaction.The configuration of atoms in the activated complex of an uncatalyzed reaction is the same as that of a catalyzed reaction, except for the presence of the catalyst.The activated complex represents the highest energy state along the transition path of a chemical reaction.A reaction in which the energy of the activated complex is very large indicates that the reactants are very thermodynamically stable (as opposed to chemically stable).The activated complex of a chemical reaction is specific to that reaction.

14. A chemistry student sitting around a campfire observes that the large pieces of wood burn slowly, but a mixture of small scraps of wood and sawdust added to the flame combusts explosively. The correct explanation for the difference in the combustion between these two forms of wood is that, compared with the wood scraps and sawdust, the large pieces of wood

have a greater surface area-to-volume ratio.contain compounds with a lower heat of combustion.have a higher percent carbon.have a smaller surface area per kilogram.contain more carbon dioxide and water.

16. The reaction between nitrogen monoxide (commonly called nitric oxide) and bromine is represented above. The proposed reaction mechanism is as follows: Which of the following reaction mechanisms is consistent with the proposed mechanism?

Rate = k [NO][Br2]Rate = k [NO][Br2]2Rate = k [NO]2[Br2]2Rate = k [NO]2[Br2]Rate = k [NO]2

17. The production of iron (II) sulfide occurs at a significantly higher rate when iron filings are used instead of blocks (volume = 0.1 mL). Which of the following best explains this observation?

The iron filings have a much greater area in contact with sulfur.The reactant order of iron in the rate law is 1 for Fe(s) and 2 for Fe2+.The iron filings are partially oxidized due to their greater exposure to oxygen.The iron in the block is Fe(s) and the iron in the filings is Fe2+.The iron block is too concentrated to chemically react.

18. The rate constant for a certain chemical reaction at 25°C is 9.0 × 105 L2mol−2sec−1. Which of the following must be true regarding this reaction?

This reaction is slower than a reaction that has a rate constant of 9.0 L2mol?2sec?1.Doubling the concentration of reactants will increase the reaction rate by a factor of 8.1 × 1010.The reaction order is 3.This reaction is exothermic.The rate of this reaction will decrease with increasing temperature.

19. The rate laws for the reaction between O2 and NO is k = [O2][NO]2. If the reaction rate is first measured with O2 and NO of 2.5 × 10−4 M each, by what factor will the rate increase if the concentration of O2 and NO are both increased to 5.0 × 10−4 each?

86423

20 Questions

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20 Questions

❤ If you liked Fatskills, consider supporting us by checking out The Life Manuals You Never Got.

About | Explore | User Guide | Topics | Subjects | Doubt Solver | Career Aptitude Test | Answers | Free Tools | OSHA Basics Quiz | What Should We Know? Privacy | Terms |

Without work one finishes nothing. - Ralph Waldo Emerson© 2026 Fatskills.com

All trademarks, logos and brand names are the property of their respective owners. All company, product and service names used in this website are for identification purposes only. Use of these names, trademarks and brands does not imply endorsement.

About | Explore | User Guide | Topics | Subjects | Doubt Solver | Career Aptitude Test | Answers | Free Tools | OSHA Basics Quiz | What Should We Know?
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Without work one finishes nothing. - Ralph Waldo Emerson
© 2026 Fatskills.com