Diffusion and Effusion

Grahams law of effusion states that the rate of effusion of gases at the same temperature and pressure are _______.

• directly proportional to the mass

• inversely proportional to the molar mass

• inversely proportional to the square root of the molar mass

• directly proportional to the square root of the molar mass

Why would O₂ effuse faster than CO₂ if they are at the same conditions?

• because O₂ has more kinetic energy

• because O₂ has a smaller molar mass

• because O₂ has a higher temperature

• they will effuse the same because the temperature is fixed

Effusion is

• used to describe the combustibility of a gas.

• the ability of a gas to escape through a tiny opening

• what occurs after diffusion.

• the ability of a gas to mix with other gases.

The picture below is an example of _________________ .

• osmosis

• effusion

• diffusion

Gas escaping from a tiny opening in a football is an example of

• Diffusion

• Effusion

• Tom Brady trying to win a championship game.

Lighter gases have a ________________ rate of effusion.

• faster 

• slower

• rate of effusion does not depend on mass.

Which will travel faster: oxygen gas or helium gas?

• O₂

• He

Which of the following best describes diffusion?

• The movement of particles from an area of high concentration to an area of low concentration

• The movement of particles from an area of low concentration to an area of high concentration

• The movement of particles through a semi-permeable membrane

• The movement of particles in a circular motion

According to Graham's law, the rate of effusion of a gas is inversely proportional to the square root of its:

• Volume

• Pressure

• Molar mass

• Temperature

If a gas has a molar mass of 4 g/mol, how does its rate of effusion compare to a gas with a molar mass of 16 g/mol?

• It effuses 2 times faster

• It effuses 4 times faster

• It effuses 2 times slower

• It effuses 4 times slower