1. Behavior of Gases

2. Gases exert Pressure Due to collisions of particles Barometer Review units Compression of gas absorbs E

3. Dalton’s Law of Partial Pressures

4. Factors Affecting Gas Behavior Amount of gas Volume Temperature Pressure

5. P and V Demo

6. P and V: P V P 1 V 1 = P 2 V 2 INVERSE relationship BOYLES’ LAW

7. V and T Demo

8. Volume & Temperature: Directly proportional. Charles’ Law

10. P and T Demo

11. Pressure and Temperature: Gay-Lussac’s Law Directly proportional.

12. Combined Gas Law

13. Sample Problems A helium-filled balloon at room temperature (21 o C) has a pressure of 730.mmHg and a volume of 4.0L. If the temperature is increases to 30 o C, what will the volume be if the pressure changes to 720.mmHg? A gas with a volume of 300. ml at 150.0 o C is heated until its volume is 600. ml. What is the new temp of the gas if the pressure remains constant?

14. Ideal Gases Particles take up no space No attractive force b/particles fits all assumptions of the Kinetic-Molecular Theory.

15. Ideal Gases & Real Gases Real gases deviate from the ideal gas law at high pressures

16. Modify the Combined Gas Law for an IDEAL GAS Add n to represent # of moles Combine initial P,V,T,n at standard conditions. R gas constant

17. Ideal Gas Law used to calculate the pressure, volume, number of moles, or temperature of a gas. Pressure in atm. Volume in Liters # of moles ideal gas constant: 0.0821(L*atm)/(mol*K) Temperature in Kelvin (K = °C+ 273)

18. Sample Problem What is the pressure in the atmospheres exerted by a 0.500 mol sample of nitrogen gas in a 10.0 L container at 298 K? Given: V = Unknown = n = T =

19. Gas Laws Quiz 1.What volume will 2.0 moles of nitrogen occupy at 720mmHg and 293K? 2.How many moles of oxygen will occupy a volume of 2.5L at 1.2atm and 25 o C? 3.A helium-filled balloon has a pressure of 760mmHg and a volume of 4.0L. If the temperature is 21 o C, what will the volume be if the pressure changes to 720mmHg?