Behavior of Gases
Practice Test
1.
A gas exerts a force of 18.0 N over a surface area of 3.00 m
2
. What pressure does the gas exert?
a.
18.0 Pa
b.
6.00 Pa
c.
0.167 atm
d.
56.0 lb/in
2
2.
Volume constant, the pressure of a confined gas is directly proportional to the ______________.
a.
size of the container
b.
Kelvin temperature
c.
Celsius temperature
d.
molecular mass of the gas
3.
____________ is the pressure that supports a 760-mm column of mercury.
a.
One pascal
b.
One atmosphere
c.
One meter
d.
One lb/in
2
4.
What is the volume of 44.6 L of CO
2
initially at 455 K and 3.66 atm when the conditions change to STP?
a.
0.557 L
b.
97.9 L
c.
682 L
d.
22.4 L
5.
A _____________ is a device used to measure gas pressure.
a.
thermometer
b.
balance
c.
anemometer
d.
barometer
6.
The air in tires can support a truck or automobile because gases _________________.
a.
have volume
b.
exert pressure
c.
have mass
d.
have gravity
7.
A sample of gas is held in a 10.0-L volume at 175 kPa. The temperature is kept constant while the volume is decreased until the pressure is 350 kPa. What is the new volume of the gas?
a.
1.0 L
b.
175 L
c.
5.0 L
d.
10.0 L
8.
A soda straw functions as __________________ the liquid up the straw.
a.
reduced pressure draws
b.
sucking draws
c.
air pressure pulls
d.
air pressure pushes
9.
____________________ states that equal volumes of gases at the same temperature and pressure contain equal numbers of particles.
a.
Charles's law
b.
The ideal gas law
c.
Avogadro's principle
d.
Boyle's law
10.
Temperature constant, the pressure in a gas-filled container is directly proportional to the _______________________.
a.
surface area of the container
b.
molecular mass of the gas
c.
volume of the container
d.
number of gas particles within
11.
Charles's law states that at constant pressure, the volume of a gas is _____________________ temperature.
a.
inversely proportional to the Celsius
b.
directly proportional to the Celsius
c.
inversely proportional to the Kelvin
d.
directly proportional to the Kelvin
12.
976 L of oxygen at STP is compressed into a 12.0-L tank at 273 K. What is the gas pressure in the tank?
a.
2.00 atm
b.
81.3 atm
c.
2000 mm Hg
d.
1.00 atm
13.
Which of these units is NOT appropriate for expressing gas pressure?
a.
N
b.
Pa
c.
mm of Hg
d.
atm
14.
One atmosphere pressure equals _______________.
a.
1000 kPa
b.
760 Pa
c.
76.0 torr
d.
101.3 kPa
15.
In the combined gas law, the _________________ is held constant.
a.
volume
b.
temperature
c.
pressure
d.
number of gas particles
16.
A 0.5-L container of nitrogen gas is heated under constant pressure to the boiling point of water. What is its new volume?
a.
0.86 L
b.
0.64 L
c.
0.79 L
d.
0.5 L
17.
The volume of a sample of helium gas is 4.80 L at 125
o
C and 99.8 kPa. If the volume decreases to 3.20 L and pressure remains 99.8 kPa, what is the new temperature?
a.
422
o
F
b.
273 K
c.
265
o
C
d.
-8
o
C
18.
__________ law relates pressure and volume, temperature constant.
a.
Dalton's
b.
Charles's
c.
Boyle's
d.
Gay-Lussac's
19.
The pressure of a sample of helium in a 1.0-L container is 0.857 atm. What is the new pressure if the sample is placed in a 0.5-L container? (Assume the temperature is constant.)
a.
0.429 atm
b.
1.71 atm
c.
1.38 atm
d.
0.143 atm
20.
If all three substances are at the same temperature and pressure, 0.120 L of N
2
gas reacts with 0.360 L of H
2
gas to form _________ of NH
3
gas.
a.
0.100 L
b.
0.480 L
c.
22.4 L
d.
0.240 L
21.
6.0 L of a gas exerts a pressure of 2.5 atm. When the pressure is increased to 10.0 atm, the gas volume is ____________.
a.
25 L
b.
1.0 L
c.
1.7 L
d.
1.5 L
22.
Suppose that a tire pressure gauge reads 32.1 lb/in
2
. If 14.7 lb/in
2
equals 101 300 Pa, what is the pressure in kPa?
a.
.0422 kPa
b.
221 kPa
c.
1000 kPa
d.
2.18 kPa
23.
The set of conditions 1.00 atm pressure and 0.00
o
C is defined as ________.
a.
standard temperature and pressure
b.
room conditions
c.
the melting point of air
d.
the boiling point of water
