5 Steps to a 5 AP Chemistry

Solids, Liquids, and Intermolecular Forces  175

15.Pick the answer that most likely represents the
substances’ relative solubilities in water.

(A) CH 3 CH 2 CH 2 CH 3 < CH 3 CH 2 CH 2 OH <

HOCH 2 CH 2 OH

(B) CH 3 CH 2 CH 2 OH < CH 3 CH 2 CH 2 CH 3 <

HOCH 2 CH 2 OH

(C) CH 3 CH 2 CH 2 CH 3 < HOCH 2 CH 2 OH <

CH 3 CH 2 CH 2 OH

(D) HOCH 2 CH 2 OH < CH 3 CH 2 CH 2 OH <

CH 3 CH 2 CH 2 CH 3

(E) CH 3 CH 2 CH 2 OH < HOCH 2 CH 2 OH <

CH 3 CH 2 CH 2 CH 3

16.What is the energy change that accompanies the
conversion of molecules in the gas phase to a
liquid?

(A) heat of condensation

(B) heat of deposition

(C) heat of sublimation

(D) heat of fusion

(E) heat of vaporization

17.Which of the following explains why the melting
point of sodium chloride (NaCl 801°C) is lower
than the melting point of calcium fluoride
(CaF 21423 °C)?

I. The chloride ion is smaller than the fluoride ion.

II. The ratio of anions to cations is lower in

sodium chloride.

III. The charge on a sodium ion is less than the

charge on a calcium ion.

(A) I and II

(B) I, II, and III

(C) III only

(D) II only

(E) I only

18.Which point on the diagram below might repre-

sent the normal melting point?

(A) C

(B) B

(C) E

(D) A

(E) D

19.The above diagram represents the heating curve

for a pure crystalline substance. The solid is the

only phase present up to point

(A) C

(B) B

(C) E

(D) A

(E) D

Time

TemperatureA

B

C

D

E

Temperature

Pressure

E

A

B

D

C