Gases

At a constant pressure, the volume decreases.  What happens to the temperature?

• increases
• decreases
• stays the same

At a constant volume, the pressure increases.  What happens to the temperature?

• increases
• decreases
• stays the same

At a constant temperature, the volume decreases.  What happens to the pressure?

• increases
• decreases
• stays the same

A 2.00 L sample of pure oxygen gas (O₂) is measured at STP.  How many moles of oxygen is this?

• 24.4 mol
• 0.007 mol
• 1.44 mol
• 0.09 mol

Calculate the volume that a 0.323-mol sample of a gas will occupy at -8^oC and a pressure of 0.900 atm.

• 7.18 L 
• 7.81 L
• 4.63 L
• 4.36 L

At STP (Standard Temperature and Pressure), a gas has a volume of
3.0 L. What is the new volume if the pressure increases to 303.9 kPa? 

• 9.0 L
• 1.0 L
• 9.0 kPa
• 1.0 kPa

Diffusion is

• the ability of one gas to mix with another gas.
• the rate at which a gas flows through the air.
• an explosion of gases.
• the ability of a gas to move from a high pressure to a low pressure.

At a constant pressure, the volume decreases.  What happens to the temperature?

• increases
• decreases
• stays the same

At a constant temperature, pressure increases.  What happens to the volume?

• increases
• decreases
• stays the same

At STP (Standard Temperature 273 K and Pressure 101.3 kPa), a gas has a volume of 3.0 L. What is the new volume if the pressure increases to 303.9 kPa?

• 9 L

• 1 L

• 9 kPa

• 1 kPa