1. Boyle’s Law Pressure and Volume of a gas are inversely related at a constant temperature and constant number of particles.

2. Using Boyle’s Law A balloon has a volume of 1.5 L at 20 o C and 101 kPa. If the balloon is placed into a vacuum jar and the pressure is lowered to 50 kPa, what is the new volume of the balloon?

3. Boyle’s Law Lab

4. Organize the givens Temperature constant Number moles constant Press 1 = 101 kPa Press 2 = 50 kPa Vol 1 = 1.5 L Vol 2 = ? mL Find the equation P1 x V1 = P2 X V2 Isolate the variable V2 = P1 X V1 P2

5. Plug and Chug V2 = P1 X V1 P2 V2 = 101kPa x 1.5 L= 3.0 L 50kPa

6. http://www.youtube.com/watch?v=IkRIKGN3i0k Charles’s Law Demonstration

7. Problem from Demonstration Professor Bob fills the glove to 0.75 liters of air at 20 o C and 1 atm of pressure. Liquid nitrogen at 1 atm liquid nitrogen has a boiling temperature of -198 o C. What is the volume of the balloon in the container with liquid nitrogen?

8. Who’ Gas Law? Organize the givens Pressure constant Number moles constant Temp 1 = 20 o C + 273= 293K Temp 2 = -198 o C + 273= 75K Vol 1 = 0.75L Vol 2 = ? L Find the equation V1 = V2 T1 T2 Isolate the variable

9. Plug and Chug V2 = V1 x T2 T1 V2 = 0.75L x 75K= 0.19L 298 Why can’t we use o C to solve this problem?

10. Gay-Lussac’s Law P T Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem Temperature (K) Pressure (kPa) P/T (kPa/K) 248922.70 2731012.70 2981102.71 3731382.70

11. Gay-Lussac’s Law The pressure and absolute temperature (K) of a gas are directly related *at constant mass & volume P T Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem