AnswersCA-Chemistry ASolids and Plasmas

Pressure Answers

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1
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Which unit of pressure is derived from the early barometers used to measure pressure?

A
mmHg
B
bar
C
Pa
D
atm
2
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How many atm are in 1,520 mmHg?

A
0.500 atm
B
2.00 atm
C
15.0 atm
D
203 atm
3

The pressure inside a gas cylinder is 3,506 mmHg. How many atmospheres of pressure is the gas exerting on the cylinder?

A
0.2168 atm
B
4.613 atm
C
34.60 atm
D
467.4 atm
4

Which is the SI unit for pressure?

A
Pa
B
Torr
C
psi
D
inHg
5

Equal amounts of four gases are placed in identical containers at the temperatures that are noted below.Samples of Gases at Different TemperaturesGasTemperature (°C)P10.2Q25.4R25.9S33.2Molecules of which gas would exert the greatest collision force?

A
gas P
B
gas Q
C
gas R
D
gas S
6

Which unit is commonly used for measuring pressure?

A
m3
B
bar
C
N/m3
D
Celsius
7

If the atmospheric pressure on the top of a mountain is 0.2396 atm, what is the pressure in kilopascal (kPa)?

A
2.365 ´ 10–3 kPa
B
24.28 kPa
C
182.1 kPa
D
422.9 kPa
8

A hiker seals a plastic bag that contains dried fruits before he climbs a mountain. What will most likely happen to the plastic bag as the hiker reaches the top of the mountain?

A
The bag will expand.
B
The bag will shrink.
C
The bag will remain the same size.
D
The bag will allow air to enter.
9

An empty plastic bottle is sealed in a cool room and then moved to a very hot room. What can best be stated about the air pressure inside the bottle when the bottle reaches room temperature?

A
It is lower than the pressure on the outside of the bottle.
B
It is higher than the pressure on the outside of the bottle.
C
It is the same as the pressure on the outside of the bottle.
D
It exerts twice the force per unit area as the air pressure outside the bottle.
10

Why does a plastic bottle that is sealed at a high altitude change its shape when it is taken to a low altitude?

A
The number of gas molecules that strike the outside of the bottle increases as altitude decreases.
B
The number of gas molecules that strike the outside of the bottle decreases as altitude decreases.
C
The bonds between the molecules of the plastic bottle become weaker as the altitude decreases.
D
The bonds between the molecules of the plastic bottle become stronger as the altitude decreases.
11

A factory at a low elevation ships bags of popcorn to cities at high elevations. Why does the factory manager need to monitor the amount of air in each bag?

A
Too few molecules can cause the bag to collapse and crush the popcorn as it moves from a low pressure to a high pressure.
B
Too many molecules can cause the bag to pop as it moves from a low pressure to a high pressure.
C
Too few molecules can cause the bag to collapse and crush the popcorn as it moves from a high pressure to a low pressure.
D
Too many molecules can cause the bag to pop as it moves from a high pressure to a low pressure.
12

Which corresponds to a pressure of 1.23 atm?

A
8.73 mmHg
B
9.23 mmHg
C
125 mmHg
D
935 mmHg
13

How many mmHg are in 1.6320 atm?

A
12.241 mmHg
B
165.36 mmHg
C
465.69 mmHg
D
1,240.3 mmHg

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