SAT Subject Test Chemistry,10 edition

8 . According   to  chemical    kinetic theory, a   reaction    can occur

(A) if  the reactants   collide with    the proper  orientation

(B) if  the reactants   possess sufficient  energy  of  collision

(C) if  the reactants   are able    to  form    a   correct transition  state

(D) All of  the above

9 . The number  of  undecayed   nuclei  in  a   sample  of  bromine-87  decreased   by  a   factor  of  4

over    a   period  of  112 s.  What    is  the rate    constant    for the decay   of  bromine-87?

(A) 56  s

(B) 6.93    ×   10−1 s−1

(C) 1.24    ×   10−2 s−1

(D) 6.19    ×   10−3 s−1

10 . Which of the following is most likely to increase the rate of a reaction?

(A) Decreasing  the temperature

(B) Increasing  the volume  of  the reaction    vessel

(C) Reducing    the activation  energy

(D) Decreasing  the concentration   of  the reactant    in  the reaction    vessel

11 . All of the following are true statements concerning catalysts EXCEPT

(A) A   catalyst    will    speed   the rate-determining    step.

(B) A   catalyst    will    be  used    up  in  a   reaction.

(C) A   catalyst    may induce  steric  strain  in  a   molecule    to  make    it  react   more    readily.

(D) A   catalyst    will    lower   the activation  energy  of  a   reaction.

12 . The equilibrium constant, Keq, of a certain single-reactant reaction is 0.16. Suppose an
appropriate catalyst is added.