SAT Subject Test Chemistry,10 edition

62 . Which of the following generalizations CANNOT be made about the phase change of a
pure substance from solid to liquid?

(A) It  involves    a   change  in  potential   energy.

(B) It  involves    no  change  in  temperature.

(C) It  involves    a   change  in  kinetic energy.

(D) It  involves    a   change  in  entropy.

(E) It  may occur   at  different   temperatures    for different   compounds.

63 . What occurs in the following reaction?

NH 4 + + H 2 O NH 3 + H 3 O+

(A) Electron    transfer

(B) Neutralization

(C) Double  replacement

(D) Reduction

(E) Proton  transfer

64 . What is the value of the equilibrium constant for the following reaction if the equilibrium
concentrations of nitrogen, hydrogen, and ammonia are 1 M, 2 M, and 15 M, respectively?

N 2  (g)    +   3H 2    (g)     2NH 3    (g)

(A) 0.035

(B) 7.5

(C) 28

(D) 380

(E) None    of  the above