5 Steps to a 5 AP Chemistry

332  STEP 5. Build Your Test-Taking Confidence

50.All the following substances will dissolve in water.
Pick the nonelectrolyte.

(A) Ca(NO 3 ) 2

(B) KOH

(C) C 2 H 5 OH

(D) HCl

(E) CH 3 COOH

51.To prepare 4.0 L of a 0.50-molar KClO 3 solution
(molecular mass 122.6), a student should follow
which of the following procedures?

(A) The student should weigh 245.2 g of solute

and add 4.0 L of water.

(B) The student should weigh 61.3 g of solute

and add sufficient water to obtain a final

volume of 4.0 L.

(C) The student should weigh 61.3 g of solute

and add 4.0 Kg of water.

(D) The student should weigh 245.2 g of solute

and add sufficient water to obtain a final

volume of 4.0 L.

(E) The student should weigh 61.3 g of solute

and add 4.0 L of water.

52.Choose the aqueous solution with the highest
boiling point.

(A) 0.20 M HNO 3

(B) 0.20 M HClO

(C) 0.40 M C 3 H 7 OH

(D) 0.20 M KI

(E) 0.20 M Na 2 SO 4

53.Which of the following aqueous solutions freezes
at the lowest temperature?

(A) 0.25 m NaNO 3

(B) 0.25 m FeSO 4

(C) 0.25 m C 12 H 22 O 11

(D) 0.25 m (NH 4 ) 2 CrO 4

(E) 0.25 m KCl

54.For the following reaction, H 2 (g) +I 2 (g) →2 HI(g),

the rate law is: Rate =k[H 2 ][I 2 ]. If a small amount

of iodine vapor (I 2 ) is added to a reaction mixture

that was 0.10 molar in H 2 and 0.20 molar in I 2 ,

which of the following statements is true?

(A) Both kand the reaction rate decrease.

(B) Both kand the reaction rate increase.

(C) Both kand the reaction rate remain the same.

(D) Only kincreases; the reaction rate remains

the same.

(E) Only the rate increases; kremains the same.

55.Step 1: (CH 3 ) 3 CBr(aq) →(CH 3 ) 3 C+(aq) +Br–(aq)

Step 2: (CH 3 ) 3 C+(aq) +H 2 O(l)

→ (CH 3 ) 3 COH 2 +(aq)

Step 3: (CH 3 ) 3 COH 2

+

(aq) →H+(aq)

+(CH 3 ) 3 COH(aq)

The above represents a proposed mechanism for

the hydrolysis of (CH 3 ) 3 CBr. What are the over-

all products of the reaction?

(A) (CH 3 ) 3 C+and Br–

(B) (CH 3 ) 3 COH 2 +and H+

(C) (CH 3 ) 3 COH and H+

(D) (CH 3 ) 3 COH, H+, and Br–

(E) H+and Br–

56.The table below gives the initial concentrations

and rate for three experiments.

INITIAL RATE

INITIAL INITIAL OF FORMA-

[H 2 ] [NO] TION OF N 2 O

EXPERIMENT (mol L–1) (mol L–1) (mol L–1s–1)

1 0.100 0.100 2.80 × 105

2 0.200 0.100 5.60 × 105

3 0.200 0.200 2.24 × 106

The reaction is H 2 (g) +2 NO(g) →N 2 O(g) +

H 2 O(g). What is the rate law for this reaction?

(A) Rate =k[NO]

(B) Rate =k[NO]^2 [H 2 ]^2

(C) Rate =k[H 2 ]

(D) Rate =k[NO]^2 [H 2 ]

(E) Rate =k[NO][H 2 ]

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