5 Steps to a 5 AP Chemistry

Take a Diagnostic Exam  23

55.Which point on the above diagram represents the
triple point?

Chapter 13

56.A solution is prepared by dissolving 0.500 mol of
NaCl in 500.0 g of water. Which of the following
would be the best procedure to determine the
molarity of the solution?

(A) Measure the volume of the solution.

(B) Titrate the solution with standard silver nitrate

solution.

(C) Determine the freezing point of the solution.

(D) Determine the osmotic pressure of the solution.

(E) Measure the mass of the solution.

57.A chemist needs 800 mL of a 0.50 M bromide
ion, Br−, solution. She has 800 mL of a 0.20 M
KBr solution. How many moles of solid MgBr 2
will she need to add to increase the concentration
to the desired value?

(A) 0.24

(B) 0.50

(C) 0.30

(D) 0.12

(E) 0.15

58.A solution of pentane, C 5 H 12 , in carbon tetra-

chloride, CCl 4 , is nearly ideal. The vapor pressure

of pentane is 450 mm Hg at 20°C, and the vapor

pressure of carbon tetrachloride is 87 mm Hg at

this temperature. What is the mole fraction of

carbon tetrachloride in the vapor over an

equimolar solution of these two liquids?

(A) 0.16

(B) 0.84

(C) 0.19

(D) 0.87

(E) 0.50

59.How many grams of HNO 3 (molecular weight

63.0) are in 500.0 mL of a 5.00 M solution?

(A) 31.5 g

(B) 63.0 g

(C) 5.00 g

(D) 315 g

(E) 158 g

60.Which of the following aqueous solutions would

have the greatest freezing point depression?

(A) 0.15 M NH 4 Br

(B) 0.15 M Ca(C 2 H 3 O 2 ) 2

(C) 0.15 M KIO 3

(D) 0.15 M KC 2 H 3 O 2

(E) 0.15 M C 2 H 4 (OH) 2

Chapter 14

61.Step 1: 2 NO 2 (g)→ N 2 (g) +2 O 2 (g)

Step 2: 2 CO(g) +O 2 (g)→ 2 CO 2 (g)

Step 3: N 2 (g) +O 2 (g)→ 2 NO(g)

The above represents a proposed mechanism for

the reaction of NO 2 with CO. What are the over-

all products of the reaction?

(A) N 2 and O 2

(B) O 2 and CO 2

(C) N 2 and NO

(D) NO only

(E) NO and CO 2

D

B

A

E

Temperature

Pressure

C