5 Steps to a 5 AP Chemistry

AP Chemistry Practice Exam 2  327

AP Chemistry Practice Exam 2—Multiple Choice

Time—1 hour and 30 minutes

Answer the following questions in the time allowed. You may use the periodic table at the

back of the book.

The AP exam is a timed exam; keep this in mind as you prepare. When taking the

various tests presented in this book, you should follow the AP exam rules as closely

as possible. Anyone can improve his or her score by using notes, books, or an unlim-

ited time. You will have none of these on the AP exam, so resist the temptation to

use them on practice exams. Carefully time yourself; do not use other materials; and

use a calculator only when expressly allowed to do so. After you have finished an

exam, you may use other sources to go over questions you missed or skipped. We have

seen many students get into trouble because the first time they attempted a test

under “test conditions” was on the test itself.

1. Choose the strongest Lewis acid from the
   following.

(A) SO 4

2–

(B) Fe^3 +

(C) Cl–

(D) Na+

(E) NO 3

2. Chlorine forms a number of oxyacids. Which of
   the following is the correct order of increasing
   acid strength?

(A) HClO 3 <HClO 4 <HClO <HClO 2

(B) HClO 4 <HClO 3 <HClO 2 <HClO

(C) HClO <HClO 2 <HClO 3 <HClO 4

(D) HClO 4 <HClO 3 =HClO 2 <HClO

(E) HClO 4 =HClO 3 <HClO 2 <HClO

3. Oxidation of which of the following substances
   will yield a stronger acid?

(A) H 2 CO 3

(B) HNO 3

(C) HIO

(D) HIO 4

(E) H 2 SO 4

4. A student prepared five vinegar samples by pipet-
   ting 10.00-mL samples of vinegar into five sepa-
   rate beakers. Each of the samples was diluted
   with deionized water, and phenolphthalein was
   added as an indicator. The samples were then
   titrated with standard sodium hydroxide until the
   appearance of a permanent pink color indicated
   the end point of the titration. The following vol-
   umes were obtained.

Volumes of standard NaOH

Sample 1: 43.28 mL

Sample 2: 43.27 mL

Sample 3: 50.00 mL no color change

Sample 4: 43.26 mL

Sample 5: 43.24 mL

Which of the following is the most likely cause

for the variation in the results?

(A) Too much deionized water was added to the

third sample.

(B) The student forgot to add phenolphthalein

to the third sample.

(C) More acetic acid was present in the third

vinegar sample.

(D) The student did not properly rinse the buret

with sodium hydroxide solution.

(E) Too much indicator was in the third sample.

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