Chemistry In Focus A Molecular View Of Our World 5th Edition By Nivaldo – Test Bank

Chapter 11—The Air Around Us

MULTIPLE CHOICE

1. Pressure is defined as
a. force times unit area.
b. mass times acceleration.
c. mass divided by density.
d. force divided by unit area.
e. mass divided by acceleration.

ANS: D PTS: 1

2. What causes pressure?
a. constant small fluctuations in temperature.
b. collisions of gas molecules with other gas molecules.
c. collisions of gas molecules with their container.
d. weather
e. None of the above

ANS: C PTS: 1

3. Which of the following is the formula for the chemical compound found in airbags?
a. Na3N
b. NaN3
c. Na2O
d. NaO2

ANS: B PTS: 1

4. The layer of air which surrounds the earth is known as the ____.
a. crust
b. pressure
c. atmosphere
d. gas constant
e. Boyle’s constant

ANS: C PTS: 1

5. Which of these statements about pressure is incorrect?

I. Pressure is directly proportional to the number of gas molecules.
II. Pressure is directly proportional to temperature.
III. Pressure is directly proportional to volume.

a. I only
b. III only
c. I and II
d. I and III
e. II and III

ANS: B PTS: 1

6. Which of these is not a possible unit for pressure?
a. g/mL
b. lb/in2
c. Pa
d. N/m2
e. mmHg

ANS: A PTS: 1

7. Which of these is not a possible unit for pressure?
a. mmHg
b. psi
c. torr
d. atm
e. J/s

ANS: E PTS: 1

8. Which of these is not a possible unit for pressure?
a. in.Hg
b. psi
c. torr
d. mmHg
e. lb/s

ANS: E PTS: 1

9. What is the correct conversion factor between atmospheres and torr?
a. 1 atm = 1 torr
b. 1 atm = 760 torr
c. 760 atm = 1 torr
d. 1 atm = 29.92 torr

ANS: B PTS: 1

10. Which of these statements concerning pressure and weather are correct?

I. Low pressure in a region tends to draw in storms.
II. High pressure in a region usually indicates clear weather.
III. Changes in pressure from region to region are responsible for winds.

a. I only
b. III only
c. I and II
d. I and III
e. I, II and III

ANS: E PTS: 1