14.1 Properties of Gases

• Gases are easily compressed because of the space between particles in a gas.
• The amount of gas (n), volume (V), and temperature (T) are factors that affect gas pressure (P).

14.2 The Gas Laws

• As the pressure of a gas increases, the volume decreases, if the temperature is constant.
• As the temperature of an enclosed gas increases, the volume increases, if the pressure is constant.
• As the temperature of an enclosed gas increases, the pressure increases, if the volume is constant.
• The combined gas law allows you to do calculations for situations in which only the amount of gas is constant.

14.3 Ideal Gases

• To calculate the number of moles of a contained gas requires an expression that contains the variable n.
• Real gases differ most from an ideal gas at low temperatures and high pressures.

14.4 Gases: Mixtures and Movements

• In a mixture of gases, the total pressure is the sum of the partial pressures of the gases.
• Gases of lower molar mass diffuse and effuse faster than gases of higher molar mass.