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Reaction Order Reaction Worksheet

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					Name: ________________________ Class: ___________________ Date: __________                                     ID: A


Reaction Rates Worksheet

Multiple Choice
Identify the choice that best completes the statement or answers the question.




                                                           Figure 22-2

   1. What is the activation energy for the forward                6. What is the value of ΔH for the reverse
       reaction in Figure 22-2?                                        reaction in Figure 22-2?
       a. –20 kJ b. –50 kJ c. +50 kJ d. +20 kJ                         a. –30 kJ b. +20 kJ c. –20 kJ d. +30 kJ
   2. In Figure 22-2, how would the addition of a                  7. What is the energy of the products of the
       catalyst affect the energies of the reactants and               forward reaction in Figure 22-2?
       products?                                                       a. +10 kJ b. +60 kJ c. +30 kJ d. +40 kJ
       a. The energy of only the products would be
       lowered. b. The energy of only the reactants                8. In Figure 22-2, what is the value of ΔH for the
       would be lowered. c. The energies of                            forward reaction?
       reactants and products would not be affected.                   a. +20 kJ b. +30 kJ c. –20 kJ d. –30 kJ
       d. The energy of both the reactants and                     9. Which of the following factors does NOT affect the
       products would be lowered.                                     rate of the reaction?
                                                                      a. the physical state of the reactants
   3. What is the activation energy for the reverse                   b. temperature c. the amount of the reactants
       reaction in Figure 22-2?                                       d. the size of the container used
       a. +50 kJ b. –20 kJ c. +20 kJ d. –50 kJ
                                                                  10. Species that appear in some steps but do not appear
   4. Using Figure 22-2, what is the energy of the                    in the net equation are
       activated complex?                                             a. products. b. reactants. c. intermediates.
       a. +60 kJ b. +30 kJ c. +20 kJ d. +40 kJ                        d. activated complexes.

   5. What is the energy of the reactants of the                  11. What factor accounts for the fact that powdered
       forward reaction in Figure 22-2?                                sugar dissolves more quickly than granulated
       a. +10 kJ b. +30 kJ c. +40 kJ d. +60 kJ                         sugar under the same conditions?
                                                                       a. nature of reactants b. surface area
                                                                       c. concentration d. temperature



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Name: ________________________                                                                                 ID: A


 12. A reaction is zero order in reactant A and second           20. If the surface area of reactants is larger,
     order in reactant B. What happens to the reaction               a. the reaction rate is generally lower. b. the
     rate when the concentrations of both reactants are              reaction rate is not affected. c. the
     doubled?                                                        rate-determining step is eliminated. d. the
     a. The reaction rate remains the same. b. The                   reaction rate is generally higher.
     reaction rate increases by a factor of two. c. The
     reaction rate increases by a factor of four. d. The         21. The rate for a reaction between reactants L, M, and
                                                                     N is proportional to the cube of [L] and the square
     reaction rate increases by a factor of eight.
                                                                     of [M]. What is the rate law for this reaction?
 13. The rate-determining step of a reaction is the                  a. R = k[L]3[M]2[N] b. R = k[3L][2M] c. R =
     a. first step. b. fastest step. c. last step.                   k[3L][2M][N] d. R = k[L]3[M]2
     d. slowest step                                             22. At what stage of a reaction do atoms have the
 14. Which of the following statements about a catalyst              highest energy?
     is true?                                                        a. transition state stage b. The stage of highest
     a. A catalyst can accelerate a reaction. b. A                   energy depends on the atom. c. product stage
     catalyst can initiate a reaction. c. A catalyst can             d. reactant stage
     be changed during a reaction. d. A catalyst can be          23. If the concentration of reactants is higher,
     consumed during a reaction.                                     a. the reaction rate is generally lower. b. the
 15. If a collision between molecules is very gentle, the            reaction rate is generally higher. c. the reaction
     molecules are                                                   rate is not affected. d. the rate-determining step is
     a. likely to rebound without reacting. b. likely to             eliminated.
     react. c. less likely to be oriented favorably.             24. The sequence of steps that occurs in a reaction
     d. more likely to be oriented favorably.                        process is called the
 16. The value of k in a rate law                                    a. order of the reaction. b. reaction mechanism.
     a. is the same under all conditions. b. varies with             c. overall reaction. d. rate law.
     temperature. c. varies with time. d. varies with            25. A rate law relates
     concentration.                                                  a. energy and concentration. b. temperature and
 17. If the temperature of the reactants is lower,                   concentration. c. reaction rate and concentration.
     a. the rate-determining step is eliminated. b. the              d. reaction rate and temperature.
     reaction rate is generally lower. c. the reaction           26. Activation energy is
     rate is generally higher. d. the reaction rate is not           a. the enthalpy of reaction. b. free energy.
     affected.                                                       c. the net energy required to turn reactants into
 18. If doubling the concentration of a reactant                     products. d. the energy required to form the
     quadruples the rate of the reaction, the                        activated complex.
     concentration of the reactant appears in the rate law       27. The letter k in a rate law stands for
     with a(n)                                                       a. a proportionality constant. b. reaction rate.
     a. exponent of 4. b. exponent of 2. c. exponent                 c. temperature. d. concentration.
     of 1. d. coefficient of 2.
                                                                 28. According to the collision theory,
 19. Raising the temperature of gas particles
                                                                     a. all collisions result in some kind of
     a. increases both collision energy and favorability
     of orientation. b. increases favorability of                    chemical reaction. b. the energy level of the
     orientation but does not increase collision energy.              particles determines whether a reaction occurs.
     c. increases collision energy but does not increase              c. molecular orientation alone determines the
     favorability of orientation. d. increases neither                effectiveness of a collision. d. both molecular
     collision energy nor favorability of orientation.                orientation and energy level must be right for a
                                                                      reaction to occur.


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