1. Aim: How does temperature affect the behavior of gases?
Do Now:
Take out a calculator and reference tables.
Explain the relationship between P, V and K.

2. Temperature Increased Temperature Decreased
What happens to the volume of a gas when the temperature of a gas is changed?
Temperature Increased
Temperature Decreased
**Remember – Temperature is a measurement of kinetic energy. Why does the volume change when the temperature changes?

3. V=KT or =K Charles’ Law V T
Compares the temperature and volume of a gas when the pressure remains constant.
Charles’ Law states: The volume of a gas at constant pressure varies directly with its absolute temperature (Remember that absolute temperature can be found using °C+273)
This can be expressed as
V=KT or =K V T

4. Charles’ Law Illustrated

5. How can we use this information?
Because V/T is constant, we can calculate the volume or temperature of a gas before or after an experiment using the formula: or

6. Practice Problem #1
If I have 45 liters of helium in a balloon at 250 C and increase the temperature of the balloon to 550 C, what will the new volume of the balloon be?

7. Practice Problem #2
Calcium carbonate decomposes at C to form carbon dioxide and calcium oxide. If 25 liters of carbon dioxide are collected at C, what will the volume of this gas be after it cools to 250 C?

8. Practice Problem #3
I have 130 liters of gas in a piston at a temperature of 2500 C. If I cool the gas until the volume decreases to 85 liters, what will temperature of the gas be?

9. Activity
Complete the worksheet you were given in class. A copy will be posted on wagnerhigh.net.

10. Homework #
Complete the practice regents questions on the back of the worksheet you were given. A copy will be posted on wagnerhigh.net.