Draw a sketch of a phase diagram. Using arrows, indicate where the 6 different phase changes are occurring.

*Note- heat is added without an increase in temperature during phase changes

•GAS LAWS

Boyle’s Law

• Volume of a given amount of gas held at a constant temperature varies inversely with the pressure

P1V1=P2V2

Boyle’s Law

Boyle’s Law

• A balloon with a volume of 2.0 L is filled with a gas at 3 atmospheres. If the pressure is reduced to 0.5 atmospheres without a change in temperature, what would be the volume of the balloon?

• The volume of the balloon will expand to 12 L.

Charles’s Law

• The volume of a given mass of gas is directly proportional to its kelvin temperature at constant pressure

Charles’s Law

Charles’s Law

• A gas sample at 40.0 degres C occupies a volume of 2.32 L. If the temperature is raised to 75.0 degrees C, what will be the resulting volume, assuming the pressure remains constant?

• 2.58 L

Gay-Lussac’s Law

• The pressure of a given mass of gas varies directly with the kelvin temperature when the volume remains constant

Gay-Lussac’s Law

Gay-Lussac’s Law

• The pressure of a gas in a tank is 3.20 atm at 22.0 degrees C. If the temperature rises 60.0 degress C, what will be the gas pressure in the tank?

• 3.61 atm

A balloon is filled with 35.0 L of helium in the morning when the temperature is 20.0 C. By noon the temperature has risen to 45. °C. What is the new volume of the balloon?

• A sample of nitrogen gas has a volume of 478 cm3 and a pressure of 104.1 kPa. What volume would the gas occupy at 88.2 kPa if the temperature remains constant?