Notes Ch. 14.2 Gas Laws Chemistry

Boyle’s Law: Pressure and Volume If the temperature is constant, as the pressure of a gas increases, the volume decreases. Also in pressure decreases, volume will increase. Boyles law states that for a given mass of gas at constant temperature the volume of the gas varies inversely with pressure. The mathematical expression of Boyle’s Law is: P1 x V1 = P2 x V2

Charles’s Law: Temperature and Volume As the temperature of an enclosed gas increases, the volume increases, if the pressure is constant. Charles’s Law states that the volume of a fixed mass of gas is directly proportional to its Kelvin temperature if the pressure is kept constant. So mathematically: V1\T2 = V2,\T2

Gay-Lussac’s Law: Pressure and Temperature As the temperature of an enclosed gas increases, the pressure increases, if the volume is constant. Gay-Lussac’s Law states that the pressure of a gas is directly proportional to the Kelvin temperature if the volume is constant. Mathematically: P1\T1 = P2\T2

The Combined Gas Law There is an expression that combines Boyle’s, Charles’s, and Gay-Lussac’s laws. This is called the combined gas law. This allows you to do calculations for situations where only the amount of gas is constant. P1,x V1/ T1 = P2 x V2 / T2 We will go over all of this in class.