1. Gay-Lussac’s Law and the Combined Gas Law LG: I can apply the gas laws to solve problems involving temperature, volume and pressure

2. Think about it… On a cold day you may find that the tire pressure in your car is too low. Use your knowledge of kinetic molecular theory to explain why this happens.

3. Pressure-Temperature Relationship Because the pressure of a gas is directly proportional to the absolute temperature (provided, volume remains constant), the ratio of pressure to temperature is the same for any point on the graph

4. Sample Problem 1 A sample of gas is stored in a steel canister at -115⁰C, at a pressure of 39.9 kPa. If the pressure reaches 60.8 kPa, what is the final temperature in degrees Celsius?

5. The Combined Gas Law “The product of pressure and volume is directly proportional to the absolute temperature in Kelvin”

6. Sample Problem 2 A sample of carbon dioxide occupies a volume of 25.0 L when the pressure is 25 kPa and the temperature is 25⁰C. Calculate the volume occupied by the same quantity of CO 2 at STP.

7. Homework Pg. 562 # 1, 2, 8, 9, 13-15 Read Section 11.4 “Air Quality” (summarize factors that can decrease air quality and describe meaning of values on air quality health index)