Gases and Atmospheric Chemistry

The current proportion of gases is approximately

• 20% nitrogen, 80% oxygen and small proportions of various other gases.

• 80% nitrogen, 20% oxygen and small proportions of various other gases.

• 70% nitrogen, 30% oxygen and small proportions of various other gases.

• 30% nitrogen, 70% oxygen and small proportions of various other gases.

The pressure exerted by a gas in a mixture.

• effusion

• diffusion

• compressibility

• partial pressure

Why does the pressure inside a container of gas increase if more gas is added to the container?

• there is an increase in the number of collisions between particles and the walls of the container.

• there is an increase in temperature of the gas.

• there is a decrease in volume of the gas.

• there is an increase of force of the collisions between the particles and the walls of the container.

If the volume of a container of gas if reduced, what will happen to the pressure inside of the container?

• Pressure will increase

• Pressure will decrease

• Pressure will not change

• Pressure depends on the type of gas

What happens to the temperature of a gas when it is compressed?

• the temperature increases.

• the temperature decreases.

• the temperature remains the same.

• the temperature becomes unpredictable,

The volume of a gas is doubled while the temperature is held constant. How does the gas pressure change?

• It is reduced by one half.

• it does not change

• it is doubled

• it varies depending on the type of gas.

The volume of a gas is reduced from 4L to 0.5L while the temperature is held constant. How does the gas pressure change?

• It increases by a factor of 4.

• It decreases by a factor of 8.

• It increases by a factor of 8.

• It increases by a factor of 2.

A gas occupies a volume of 2.4 L at 14.1 kPa. What volume will the gas occupy at 84.6 kPa?

• 497 L

• 2.5 L

• 14 L

• 0.40 L

A sample of gas occupies 17 mL at -112^oC. What volume does the sample occupy at 70.^oC?

• 10.6 mL

• 27 mL

• 36 mL

• 8.0 mL

What does the ideal gas law allow scientists to calculate that the other gas laws do not?

• number of moles

• pressure

• volume

• temperature