Gas Laws & Phase Changes Test Review

Which of the following describes the transition from a gas to a solid?

• Evaporation

• Sublimation

• Freezing

• Deposition

Which term describes the transition of a solid to a gas?

• Evaporation

• Sublimation

• Condensation

• Deposition

What is an example of sublimation?

• dry ice changing to carbon dioxide gas

• carbon dioxide gas turning into solid dry ice

• water vapor turning into frost on windows

• liquid water crystallizing into snowflakes

Which variable describes the average kinetic energy (including speed) of particles?

• pressure

• temperature

• heat

• force

Which equation describes the Ideal Gas Law?

• PV = nRT

• P1V1 = P2V2

• P1/T1 = P2/T2

• V1/T1 = V2/T2

How would you describe STP?

• 373 K, 1 atm

• 273 K, 5 atm

• 273 K, 1 atm

• 373 K, 760 mmHg

How would you describe pressure?

• the force per unit area when particles collide

• average potential energy of particles

• transfer of heat in a gas or liquid

• a theoretical gas composed of many randomly moving particles

The speed of gas molecules decreases when temperature...

• decreases

• increases

• it cannot be predicted

• remains constant

Which of the following is NOT a unit of pressure?

• mmHg

• atm

• kPa

• mL

What happens to volume when a gas gets hotter?

• it will remain the same

• it decreases/compresses

• it increases/expands

• it cannot be predicted