1. Bell-Work September 18  Look at your Graphic Organizer from yesterday. Make a prediction of how we could combine the three equations that we have been using into one super equation.

2. Homework Review  A hot air balloon rises. The temperature inside the balloon increases due to the fire lit inside of it and the pressure in the atmosphere decreases. What will happen to the volume?  A storm blows through where the pressure is increased slightly. At the same time the weather balloon gets much, much smaller (big decrease in volume). What will happen to the temperature of the gas in the balloon?

3. Combined Gas Law-Quantitative Miss Pahls 9/18/14

4. The Combined Gas Law!  allows us to do calculations for situations in which only the amount of gas is constant  We see changes in our 3 variables at once  We have been using it all along! (You just held certain variables constant)

5. Things to remember:  Keep units consistent (start to finish)  Kelvin…..Always.

6. An Example Together:  The volume of a gas-filled balloon is 30.0 L at 313 K and 153 kPa pressure. What would the volume be at standard temperature and pressure (which is 273K and 101.3 kPa)

7. Pair Work:  A gas at 155 kPa and 25°C has an initial volume of 1.00 L. The pressure of the gas increases to 605 kPa as the temperature is raised to 125°C. What is the new volume?  A 5.00L air sample has a pressure of 107 kPa at a temperature of -50°C. If the temperature is raised to 102°C and the volume expands to 7 L, what will the new pressure be?

8. Challenge  The volume of a gas at 26°C and 75 kPa is 10.5 L. The pressure is increased to 115 kPa. What final temperature would be required to reduce the volume to 9.5 L?

9. Exit Card  A sample of sulfur dioxide occupies a volume of 652 mL at 40.° C and 720 atm. What volume will the sulfur dioxide occupy at STP(273 K and 101.3 kPa)?