Unit 10 Gases Review

How do you convert Celsius to Kelvin?

• Add 273
• Subtract 273
• You can't convert those
• They are the same thing

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

The volume of a gas is increased from 150.0 mL to 350.0 mL by heating it. If the original temperature of the gas was 25^oC, what will its final temperature be (in ^oC)

• 146 ^oC
• 10.7 ^oC
• 58.3 ^oC
• 422 ^oC

Gas pressure is caused by

• gas molecules colliding with surfaces
• gas molecules condensing to a liquid
• gas molecules hitting other gas molecule
• barometers

When you add pressure to a liquid what most likely happens?

• It becomes a solid

• It becomes a gas

• IMFs are broken

Use Graham’s Law to calculate fast O₂ gas will effuse compared to Cl₂. SHOW YOUR WORK ON PAPER

• O₂ effuses 1.5 times faster than Cl₂

• O₂ effuses 0.67 times as fast as Cl₂

• O₂ effuses 2.2 times faster than Cl₂

• O₂ effuses 0.45 times as fast as Cl₂

Lighter gases have a ________________ rate of effusion.

• faster 
• slower
• rate of effusion does not depend on mass.

Which of the following would have a faster rate of effusion: 15g of Kr or 15g of N₂?

• Kyrpton
• Nitrogen
• Both would have the same rate of effusion

Identify the factor that determines rates of diffusion and effusion for different molecules at a given temperature.

• Size of the molecules

• Polarity of the molecules

• Temperature of the gas

• Molar mass of the gas

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