1. Catalyst
1. What is the coldest possible temperature. What happens at this point? 2. You have a gas that has a pressure of 2 atm and a volume of 5 L. What is the new pressure if the gas is compressed to 2 L 3. How can you crush a can without touching it?
End

2. Crushing a Can Without Touching It

3. Justify – TPS
Using the concepts of pressure, temperature, and/or volume explain why the can was crushed without touching it.

4. LECTURE 5.3 – CHARLES AND GAY – LUSSAC’S LAW

5. Today’s Learning Targets
LT 5.8 – I can explain Charles Law, how it relates to temperature and volume, and I can calculate temperature and volume values for a given problem
LT 5.9 – I can explain Gay-Lussac’s Law, how it relates to temperature and pressure, and I can calculate temperature and pressure values for a given problem.

6. What does Gay – Lussac’s Law state?

7. I. Pressure and Temperature Relationship
Gas molecules move quicker the more we heat them up.
This means that they will be hitting the sides of the container more often. Therefore, the pressure will also increase as the temperature increases.
If we keep volume constant, then pressure and temperature are directly related.

8. Gay-Lussac’s Law

9. This is an direct relationship! As one goes up the other goes up!
Gay-Lussac’s Law
Absolute Zero
This is an direct relationship! As one goes up the other goes up!

10. Using what you Know now, Why did the Pop Can Get Crushed?

11. How do you calculate using Gay – Lussac’s Law?

12. Gay-Lussac’s Law
Gay-Lussac’s Law relates pressure and temperature through the expression:

13. Class Example
An aerosol can containing gas at 101 kPa and 22 oC is heated to 55 oC. Calculate the pressure in the heated can.

14. Summarize

15. Catalyst
1. What do Gay – Lussac’s and Boyle’s Law state 2. You have a gas that has a pressure of 2 atm and a volume of 50 K. What is the new pressure if the gas is heated to 400 K.
End

16. Dry Ice and Balloons
Obtain one balloon and a piece of dry ice. Put the dry ice in a large beaker of water. Place the balloon in a large tub and carefully pour the dry ice water over the balloon. There should be a substantial decrease in the size of the balloon. You may need to leave the balloon in the water in order for a full shrinking of the balloon to be observed.

17. Justify – TPS
Why does the volume of the balloon decrease as the cold dry ice is poured over it?

18. What is Charles’s Law?

19. I. Volume and Temperature
As you heat up gas molecules they move quicker and this causes them to hit the sides of the container with greater frequency.
If the container is capable of expanding, then the volume will increase as the temperature increases.

20. Charles Law Graph
This is a direct relationship!

21. How do you calculate using Charles’s Law?

22. I. Charles Law
Charles Law can be described by the equation:

23. Class Example
A gas is collected and found to fill 2.85 L at 25.0°C. What will be its volume at 273 K?

24. Summarize

25. Around the World

26. Exit Ticket
A gas has a pressure of atm at 20.0 °C. What is the pressure at 10 °C?
A gas is known to react at 15 atm. If the gas begins at 5 atm and 20 L, then what must your final volume be?

27. Rate Yourself
On LTs 5.1 – 5.9 rate yourself 1 – 4 based on your measured level of proficiency

29. Closing Time
Homework 5.3 – Charles’s and Gay – Lussac’s Law Practice