1. The Gas Laws

2. Kelvin Scale
The Kelvin temperature scale is a scale that starts at a temperature of -273o C. That is the lowest possible temperature and is referred to as absolute zero.
You can convert from Celsius to Kelvin using the following formula
K = oC

3. Charles’s Law
Charles’s law states that the volume of a fixed amount of gas varies directly with the Kelvin temperature.
V1 = V2
T T2
* Temperature must be in units of Kelvin.

4. Charles’s Law
Do Now
An oxygen filled balloon has a volume of 2.0L at 50oC. What would the volume of the balloon be if you cooled the gas to 20oC

5. Gay-Lussac’s Law
Gay-Lussac’s law states that the pressure of a fixed mass of gas at constant volume varies directly with the Kelvin temperature.
P1 = P2
T T2
* Temperature must be in units of Kelvin.

6. Do Now Charles and Gay-lussac
1. A gas has an initial volume of 20 L at 20 oC. If the gas is heated to 50 oC. What must be the new volume of the gas?
2. A gas has an initial Pressure of 2 atm at 200 K. If the pressure is raised to 5 atm at constant volume. What must be the new temperature of the gas?

7. Combined Gas Law
The combined gas law expresses the relationship between pressure, volume, and temperature of a fixed amount of gas.
P1V1 = P2V2
T T2
* Temperature must be in units of Kelvin.

8. Dalton’s Law of Partial Pressures
The pressure of each gas in a mixture is called the partial pressure of that gas.
Dalton’s law states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases.
P Total = P1 + P2 + P3

9. Dalton’s Law of Partial Pressures

10. Conversions
1atm = 760 mm Hg
If a balloon has a pressure recorded as 740 mm Hg. What would the pressure be in atm.