Gases

Charles's law says at constant pressure, the volume of a gas is proportional to its:

• 1 Mass
• 2 Celsius temperature
• 3 Density
• 4 Absolute temperature

A gas occupies 2 dm3 at 300 K. At constant pressure, its volume at 600 K is:

• 1 4 dm3
• 2 8 dm3
• 3 2 dm3
• 4 1 dm3

The ideal gas equation is:

• 1 P = nRTV
• 2 PV = RT / n
• 3 PV = nRT
• 4 PT = nRV

Graham's law says the rate of diffusion of a gas is inversely proportional to the square root of its:

• 1 Density or molar mass
• 2 Temperature only
• 3 Colour
• 4 Volume

Real gases behave most like ideal gases at:

• 1 High pressure and low temperature
• 2 Low pressure and high temperature
• 3 Low pressure and low temperature
• 4 High pressure and high temperature

The pressure of 2 moles of an ideal gas in a 10 dm3 vessel at 300 K is closest to: (R = 0.0821 dm3 atm / K mol)

• 1 1 atm
• 2 0.49 atm
• 3 49 atm
• 4 4.9 atm

The SI unit of pressure is the:

• 1 Atmosphere
• 2 Bar
• 3 Torr
• 4 Pascal

At constant temperature, doubling the pressure of a gas makes its volume:

• 1 Four times
• 2 Half
• 3 The same
• 4 Double

Absolute zero is:

• 1 100 degrees C
• 2 -100 degrees C
• 3 -273 degrees C
• 4 0 degrees C