1. The Behavior of Gases

2. Kinetic Theory explains…
why gases are compressed more easily than liquids or solids

3. Kinetic Theory explains…
their ability to expand and take shape and volume of their container

4. 4 Variables used to describe a gas:
Pressure
Volume
Temperature
Number of moles

5. Factors Affecting Gas Pressure
1. Amount of gas 2. Volume 3. Temperature

6. Gas Laws 4 variables used to describe a gas P (kPa) V (L) T (K)
Number of mol (n)
How do V, T, n affect gas pressure?

7. Boyle's Law
Effect of pressure on volume of a contained gas? (constant T, n)
Decrease Pressure, _______________volume
P α 1/V P is _________________ to V
P1V1 = P2V2
As pressure doubles, volume ______________
kPa L
200 3
400
1.5
100

8. Suppose you have a gas with 45. 0 ml of volume and a pressure of 760
Suppose you have a gas with 45.0 ml of volume and a pressure of mm Hg. If the pressure is increased to mm Hg and the temperature remains constant, what will the new volume of the gas be?

9. Charles’s Law Effect of temperature on volume (n and P are constant)
As T of enclosed gas increases, V ___________
V α T (Kelvin) when P held constant
V1/T1 = V2/T2
T (K) mL 50
100
200 25

10. A soda bottle is flexible enough that the V of the bottle can change without opening it. If you have an empty soda bottle, V = 2.0 L, at room T of 25°C, what will the new volume be if you put it in your freezer?

11. Gay-Lussac’s Law What is the effect of T on P? (V, n is constant)
P _____ T (Kelvin)
As T doubles, P _____________
P1/T1 = P2/T2
kPa T(K)
300
100
600
200

12. If a gas in a closed container is pressurized from 15. 0 atm to 16
If a gas in a closed container is pressurized from 15.0 atm to 16.0 atm and its original temperature was 25.0°C, what would the final T of the gas be?

13. Combined Gas Law
P, T, V relationship
Only amount of gas is constant

14. In a lab experiment, 85.3 mL of a gas are collected at 24°C and a pressure of 733 mm Hg. Find the volume at STP.