5 Steps to a 5 AP Chemistry

328  STEP 5. Build Your Test-Taking Confidence

5. Choose the group that does not contain isotopes
   of the same element.

NUMBER OF NUMBER OF

PROTONS NEUTRONS

A. Atom I 17 18

Atom II 18 19

B. Atom I 25 30

Atom II 25 31

C. Atom I 37 42

Atom II 37 41

D. Atom I 82 126

Atom II 82 128

E. Atom I 20 18

Atom II 20 20

6.Choose the ion with the largest ionic radius.

(A) S2–

(B) H+

(C) Li+

(D) O2–

(E) Mg^2 +

7.You are given an aqueous solution of BaCl 2. The

simplest method for the separation of BaCl 2 from

the solution is

(A) filtration of the solution

(B) osmosis of the solution

(C) evaporation of the solution to dryness

(D) electrolysis of the solution

(E) centrifuging the solution

Choose one of the following for questions 8–10.

(A) Cu^2 +

(B) CO 3

2–

(C) Fe^3 +

(D) Al^3 +

(E) Pb^2 +

8.This ion is amphoteric.

9.This ion gives a white precipitate when added to

a calcium nitrate solution.

10.Solutions containing this ion give a reddish-
brown precipitate upon standing.

11.Which of the following is the correct net ionic

equation for the addition of aqueous potassium

sulfate to a solution of barium chloride?

(A) Ba^2 ++SO 4

2–

→BaSO 4

(B) Ba^2 ++K 2 SO 4 →BaSO 4 +2 K+

(C) BaCl 2 +K 2 SO 4 →BaSO 4 +2 KCl

(D) BaCl 2 +SO 4

2–

→BaSO 4 +2 Cl–

(E) BaCl 2 +P 2 SO 4 →BaSO 4 +2 PCl

12.A solution is prepared for qualitative analysis.

The solution contains the following ions: Pb^2 +,

Ni^2 +, and Al^3 +. Which of the following will cause

no observable reaction?

(A) Dilute HCl(aq) is added.

(B) Dilute K 2 CrO 4 (aq) is added.

(C) Dilute KCl(aq) is added.

(D) Dilute NH 3 (aq) is added.

(E) Dilute HNO 3 (aq) is added.

13.The addition of concentrated BaCl 2 (aq) to a

1.0 M (NH 4 ) 2 SO 4 solution will result in which of

the following observations?

(A) Nothing happens because the two solutions

are immiscible.

(B) The formation of a white precipitate takes

place.

(C) An odorless gas forms and bubbles out of the

mixture.

(D) The solution becomes basic.

(E) The odor of ammonia will be detected.

14.How many milliliters of 0.300 M H 2 SO 4 are

required to neutralize 50.0 mL of 0.600 M KOH?

(A) 20.0 mL

(B) 25.0 mL

(C) 30.0 mL

(D) 60.0 mL

(E) 50.0 mL

15.How many grams of hydrogen are in 25 g of

(NH 4 ) 2 SO 4?

(A) 2.0 g

(B) 8.0 g

(C) 1.5 g

(D) 3.0 g

(E) 0.75 g

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