5 Steps to a 5 AP Chemistry 2019

AP Chemistry Practice Exam 2 ❮ 353

52. Which of the following best represents the result
    for the reaction of 50.0 mL of a 0.20 M barium
    hydroxide, Ba(OH) 2 , solution with 50.0 mL of a
    0.10 M sulfuric acid, H 2 SO 4 , solution to form a
    precipitate of BaSO 4?
    (A)

H+

H+

OH–

OH–

BaSO 4 (s)

SO 4 2– Ba2+

(B)

OH– OH–

OH– OH–

BaSO 4 (s)

Ba2+

Ba2+

(C)

BaSO 4 (s)

Ba2+

SO 4 2– Ba2+

SO 4 2–

(D)

BaSO 4 (s)

Movable piston

53. The container in the above diagram had an initial
    volume of 10.0 L. The container was heated until
    the temperature was double the original tempera-
    ture. After heating, the pressure was measured
    and the piston moved down until the pressure
    was four times the original value. What was the
    final volume of the container?
    (A) 10.0 L
    (B) 1.25 L
    (C) 5.00 L
    (D) 20.0 L

C

Cl

Dichlorodifluoromethane Dibromodichloromethane

FF

Cl

C

Cl

Br Cl

Br

C

Br

Dibromodifluoromethane Tetrafluoromethane

FF

Br

C

F

FF

F

COMPOUND

BOILING

POINT

(çC)

MOLAR

MASS

(g mol-^1 )

Dichlorodifluoromethane - 30 121

Dibromodichloromethane 150 243

Dibromodifluoromethane 23 210

Tetrafluoromethane - 128 88

54. The diagram above shows the structure of mol-
    ecules of CCl 4 and CBr 4 , and the above table gives
    the boiling points and molar masses of the com-
    pounds. Which of the compounds is nonpolar?
    (A) Dichlorodifluoromethane
    (B) Dibromodichloromethane
    (C) Dibromodifluoromethane
    (D) Tetrafluoromethane

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