1. Do Now (3 min) When you raise the temperature, what happens to the velocity of particles in a gas?

2. Turn in your Do Nows!

3. 4-15-10 Cornell Notes “Ping” Game

4. Agenda Do Now Cornell Notes (3 gas laws) “Ping” activity - outside if we can get through notes efficiently

5. Why do our ears hurt sometimes when we fly on airplanes? Airplane ear is the stress exerted on your eardrum when the air pressure in your middle ear and air pressure in the environment are out of balance. You may experience airplane ear at the beginning of a flight when the airplane is climbing, or at the end of a flight when the plane is descending Fast changes in altitude cause air pressure changes that can trigger airplane ear

7. Pressure Force per unit area Measured in atmospheres (atm) Gas particles exert pressure when they collide with the walls of the container The more collisions, the higher the pressure

8. Temperature Measure of the average kinetic energy (energy of motion) of all the particles in a sample of matter.

9. Properties of Gases Properties of gases can be modeled using math V = volume of the gas (L) T = temperature of the gas (K) ALL temperatures must be in KELVINS! n = amount of moles of gas P = pressure (atmospheres, atm)

10. Ring of Ping Activity As a class we are going to MODEL the properties of a gas: Volume Temperature Pressure

11. Ring of Ping Activity When we get outside, everyone will form a circle – this will be our “container” 3 students will act as gas molecules Walk in straight lines Bump into walls of container and each other (elastic collisions) Stay at the same speed Do your best to model the particles we saw in the simulator yesterday

12. Ring of Ping Activity Container people: You must say “ping” every time a molecule bumps into you 1 person will record the number of “pings” 1 person will be time keeper

13. Expectations Absolutely NO TALKING in the hallway If ONE person talks, we go back to the classroom and take notes NO HORSEPLAY! If ONE person if off task, we go back to the classroom and take notes and we will not be going outside anymore for the rest of the school year We will all be returning to the classroom at the end of class, where attendance will be taken

14. Boyle’s Law P α 1/V Pressure and volume are INVERSELY proportional if moles and temperature remain constant When P goes up, V goes down and vice versa P 1 V 1 = P 2 V 2 Robert Boyle (1627-1691). Son of Earl of Cork, Ireland.

15. Boyle’s Law A bicycle pump is a good example of Boyle’s law. A bicycle pump is a good example of Boyle’s law. As the volume of the air trapped in the pump is reduced, its pressure goes up, and air is forced into the tire. As the volume of the air trapped in the pump is reduced, its pressure goes up, and air is forced into the tire.

16. Charles’s Law V α T Volume and temperature are DIRECTLY proportional IF moles and pressure remain constant When V goes up, T goes up V 1 = V 2 T 1 T 2 Jacques Charles (1746- 1823). Isolated boron and studied gases. Balloonist.

17. Charles’s Balloon Heat up the air (raise the tempreature), the volume increases (balloon inflates)

18. Gay-Lussac’s Law P α T Pressure and temperature are DIRECTLY proportional IF moles and volume remain constant When P goes up, T goes up P 1 = P 2 T 1 T 2 Joseph Louis Gay- Lussac (1778-1850)

19. Combined Gas Law Good news! We don’t have to memorize all three laws! Since they’re all related, we can combine them into ONE equation! If you only need one of the other gas laws, you can cover up the item that is constant and you will get that gas law! = P1P1 V1V1 T1T1 P2P2 V2V2 T2T2 Boyle’s Law Charles’ Law Gay-Lussac’s Law

20. Exit Slip Answer the following questions on a separate sheet of paper using the information from “The Ring of Ping” What happened to the pressure when we increased the temperature? What happened to the pressure when we decreased the volume of the container? What happened to the volume of our “balloon” when we decreased the temperature? You must hand in your answers in order to leave the classroom!