Name:_______________________________________________
Date:__________________
Cambridge - Chemical Kinetics
Multiple Choice
Identify the choice that best completes the statement or answers the question
NOTE: These questions were taken from an American textbook, so many of the vocabulary terms may be unfamiliar &
noticeably absent from your British textbook. If in doubt, you should make every attempt to Google or otherwise lookup
the terms to compare with your textbook. This will be a learning process. In fact this “quiz” is actually supposed to
help you learn more than check to see what you have already learned.
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1. Which of the following is a measure of the average kinetic energy of the particles in a sample of matter?
a. chemical kinetics
c. reaction rate
b. thermochemistry
d. temperature
2. What is the sequence of steps in a reaction called?
a. heterogeneous reaction
c. overall reaction
b. rate law
d. reaction mechanism
3. Most steps in a reaction mechanism
a. are complicated.
c. are easily observable.
b. involve several molecules.
d. are simple.
4. To be effective, a collision requires
a. sufficient energy.
b. a favorable orientation.
c. sufficient energy and a favorable orientation.
d. a reaction mechanism.
5. If colliding molecules have an orientation that favors reaction, they have
a. the correct angles and distances between atoms.
b. sufficient energy for each molecule.
c. speeds that are neither too fast nor too slow.
d. entropy values in the proper range.
6. Raising the temperature of gas particles
a. increases both collision energy and favorability of orientation.
b. increases neither collision energy nor favorability of orientation.
c. increases collision energy but does not increase favorability of orientation.
d. increases favorability of orientation but does not increase collision energy.
7. If a collision between molecules is very gentle, the molecules are
a. more likely to be favorably oriented.
c. more likely to react.
b. less likely to be favorably oriented.
d. more likely to rebound without reacting.
8. The minimum energy required for an effective collision is called
a. energy of enthalpy.
c. free energy.
b. activation energy.
d. kinetic energy.
9. A short-lived structure formed during a collision is a(n)
a. reagent.
c. activated complex.
b. catalyst.
d. inhibitor.
10. How does the energy of the activated complex compare with the energies of reactants and products?
a. It is lower than the energy of both reactants and products.
b. It is lower than the energy of reactants but higher than the energy of products.
c. It is higher than the energy of reactants but lower than the energy of products.
d. It is higher than the energy of both reactants and products.
Name:_______________________________________________
Date:__________________
____ 11. Activation energy is
a. the energy required to form the activated complex.
b. the net energy required to turn reactants into products.
c. the heat of reaction.
d. free energy.
____ 12. In an energy-profile graph (energy or enthalpy vs time), the activated complex is represented at the
a. left end of the curve.
c. bottom of the curve.
b. right end of the curve.
d. top of the curve.
____ 13. What is the energy needed to lift reactants from the energy trough?
a. free energy
c. kinetic energy
b. activation energy
d. energy of reaction
____ 14. Which statement correctly describes the energy changes that occur when bonds form and when bonds break?
a. Breaking bonds is endothermic, and forming bonds is exothermic.
b. Breaking bonds is exothermic, and forming bonds is endothermic.
c. Both are exothermic.
d. Both are endothermic.
____ 15. What branch of chemistry studies reaction rates?
a. thermochemistry
c. chemical kinetics
b. thermodynamics
d. calorimetry
____ 16. Chemical kinetics studies
a. the factors that affect the rate of reaction.
b. the mathematical expressions for the rate of reaction.
c. the factors that affect the rate of reaction and the mathematical expressions for the rate of
reaction.
d. the effect of quantum kinetics on chemical reactions.
____ 17. For most reactions, particles must
a. collide.
c. be at rest.
b. be properly oriented.
d. collide in the proper orientation.
____ 18. Reaction rate depends upon
a. both collision frequency and efficiency.
c. collision efficiency.
b. average kinetic energy.
d. average potential energy.
____ 19. If the surface area of reactants is larger,
a. the reaction rate is generally higher.
c. the reaction rate is not affected.
b. the reaction rate is generally lower.
d. the rate-determining step is eliminated.
____ 20. In heterogeneous reactions, the reactants
a. have unequal masses.
c. have unequal volumes.
b. are not equally reactive.
d. are in different phases.
____ 21. If the concentration of reactants is higher,
a. the reaction rate is generally higher.
c. the reaction rate is not affected.
b. the reaction rate is generally lower.
d. the rate-determining step is eliminated.
____ 22. If the temperature of the reactants is lower,
a. the reaction rate is generally higher.
c. the reaction rate is not affected.
b. the reaction rate is generally lower.
d. the rate-determining step is eliminated.
____ 23. A sample of a substance burns more rapidly in pure oxygen than in air. Which factor is most responsible for
this high rate of reaction?
a. the properties of the reactants
c. concentration of the substance
b. temperature
d. surface area exposed to air
____ 24. Changing the temperature affects the rate of reaction because it affects
Name:_______________________________________________
____ 25.
____ 26.
____ 27.
____ 28.
____ 29.
a. the energy of the activated complex.
b. the properties of the reactants.
c. the heat of reaction.
d. the frequency of collision and the number of effective collisions.
Which process is used to speed up chemical reactions?
a. calorimetry
c. activation
b. catalysis
d. inhibition
Which term describes a catalyst in the same phase as the reactants and products?
a. homogenous
c. activated
b. heterogeneous
d. inhibited
A substance that slows down chemical processes is called a(n)
a. inhibitor.
c. catalyst.
b. reactant.
d. indicator.
Catalysts generally affect chemical reactions by
a. increasing the temperature of the system.
b. increasing the surface area of the reactants.
c. providing an alternate pathway with a lower activation energy.
d. providing an alternate pathway with a higher activation energy.
A rate law relates
a. reaction rate and temperature.
b. reaction rate and concentrations of reactants.
c. temperature and concentrations of reactants.
d. energy and concentrations of reactants.
Date:__________________
Name:_______________________________________________
Date:__________________
Cambridge - Chemical Kinetics
Answer Section
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