Gas Law Review

Gas Laws Review

Multiple Choice

Which of the following assumption of kinetic molecular theory describes why gases are extremely fluid?

• particles do not attract or repel one another

• particles have elastic collisions

• gases are made of tiny particles that are far apart

• particles travel in straight line, continuous rapid, random motion

Multiple Choice

Gas laws involve what three variables?

• Solid Liquid Gas 
• Speed Velocity Acceleration 
• Elements Compounds Mixtures 
• Pressure Temperature Volume 

Multiple Choice

Which of the following is equivalent to 1,068kPa?

• 7,516.45 mmHg

• 7,814.2 torr

• 155.0 psi

• 11.3 atm

Multiple Choice

A gas is under 750 mm Hg of pressure. What is the pressure in atm?

1 atm = 760 mm Hg

• 1.013 atm

• 0.987 atm

• 760 atm

• 0.0013 atm

Multiple Choice

What is 50 C in Kelvin?

• 223
• 323
• 100
• 50

Multiple Choice

Convert -89 ^oC to K

• 184K

• 362K

• -362K

• -184K

Multiple Choice

The kinetic theory of matter states that all of the particles that make up matter are constantly

• growing
• shrinking
• crying
• moving

Multiple Choice

Which container will have a lower pressure?

• left
• right
• they both have the same pressure
• I don't know

Multiple Choice

A 135 mL sample of argon had its pressure changed from 75.0 kPa to 121 kPa. What is its new volume?

• 83.7 mL
• 98.3 mL
• 76.4 mL
• 5 mL

Multiple Choice

If the pressure in a balloon remains constant what happens to the balloon's volume as the temperature of the air increases?

• the balloon shrivels up
• balloon expands
• balloon stays the same size
• balloon shrinks

Multiple Choice

Find the initial volume of a gas at 150 K, if the final volume is 6 L at 100 K

• 7 L

• 8 L

• 9 L

• 10 L

Multiple Choice

The initial and final temperature of neon is 289 K and 323 K. Find the initial volume if the final volume is 2.3 L?

• 2.0 L

• 2.1 L

• 2.4 L

• 2.5 L

Multiple Choice

A gas sample is a metal cylinder has a pressure of 0.75 atm at 15^oC.  What will be the pressure of the gas if the temperature increases to 50^oC?

• 1 atm
• 0.48 atm
• 0.84 atm
• 0.76 atm

Multiple Choice

What is the pressure of a car tire that had an initial pressure of 1.8 atm but was heated from 38°C to 123°C?

• 0.9 atm

• 2.1 atm

• 1.6 atm

• 3.4 atm

Multiple Choice

How are Pressure and Temperature related?

• Inversely
• Directly
• Indirectly
• Constants

Multiple Choice

According to the Combined Gas Law, pressure and volume are inversely related which means that

• When pressure increases, volume increases
• When pressure decreases, volume decreases
• When pressure increases, volume decreases
• When pressure doubles, volume triples

Multiple Choice

4L of a gas is contained at 300 kPa and 200K. What will its volume be in L at 140 kPa and 100K?

• 4.3L
• 4.8L
• 6.2L
• 8.5L

Multiple Choice

A sample of gas measures 4.22 L at 120°C at 900 mmHg. What volume would it occupy at STP?

• 2.48 L
• 3.47 L
• 5.13 L
• 7.19 L

Multiple Choice

Which equation do you use? "A 4L container at 298K contains 0.5 moles of gas. What pressure is the container?"

• P₁V₁=P₂V₂

• P_{1 /} T₁=P_{2 /} T₂

• V_{1 /} T₁=V_{2 /} T₂

• PV=nRT

Multiple Choice

You have a balloon filled with 2 L of gas at 20^oC. The balloon has a pressure of 125 kPa. How many moles of gas are in the balloon?

• 1.5 mol

• 0.1 mol

• 0.32 mol

• 0.9 mol

Multiple Choice

Gas is in a flexible container at room temperature. What happens to pressure as the number of moles of gas decreases?

• pressure stays the same

• pressure decreases

• pressure increases

Multiple Choice

Dalton's Law states...

• that at a constant temperature the volume of a confined ideal gas varies inversely with its pressure.
• that the total pressure exerted by the mixture of non-reactive gases is equal to the sum of the partial pressures of individual gases
• how gases tend to expand when heated
• that the density of an ideal gas at constant pressure varies inversely with the absolute temperature of the gas.

Multiple Choice

Which equation represents Dalton's Law?

• e=mc2
• PV=nRT
• P1/T1=P2/T2
• Ptotal=P1, P2, P3...

Multiple Choice

Calculate the partial pressure of H2 at 20oC when the vapor pressure of water is 17.5torr. The total pressure of the gases is 750torr.

• 767.5torr

• 732torr

• 42.86torr

Multiple Choice

Three gases, Ar, N2 and H2 are mixed in a 500L container. Ar has a pressure of 255 torr, N2 has a pressure of 228torr and H2 has pressure of 752torr. What is the total pressure in the container?

• 483torr

• 270torr

• 1235torr