1. Unit 9 Outline Review

2. Warm-up
If 45.0 L methane (CH4), undergoes complete combustion according to the UNBALANCED EQUATION below at mm Hg and 20.0ºC, how many grams of water are formed?
CH O2  CO H2O

3. Unit 9 Topics Gas Properties Ideal Gas Law Combined Gas Law
Dalton’s Law of Partial Pressure
Gas Stoichiometry
Equilibrium

4. Gas Properties Kinetic Molecular Theory POGIL
Understand the characteristics of the phases of matter (spacing, potential for movement, filling a container)
Temperature and Kinetic Energy are directly related
What causes pressure?
How are P, V, T and n related? (direct or inverse relationship?)

5. Kinetic Molecular Theory
Explains behavior of ideal gases – see p. 2 of POGIL
Gases are made of particles that are so small in comparison to the volume of space between them that we can assume their volume is ZERO
Pressure is caused by gas particles hitting the wall of the container
Gas particles do not attract or repel each other
Average kinetic energy of gas particles is directly proportional to the temperature (K)

6. Real Gases
Real gases do not obey the ideal gas law at HIGH PRESSURES and LOW TEMPERATURES

7. Ideal Gas Law The Ideal Gas Law Notes
One gas with variables remaining constant (P, V, n, T)
PV=nRT
Use the R value (on pink sheet) that matches unit of Pressure.

8. Relationships between temp, pressure, and volume
Temperature and pressure are DIRECTLY RELATED
Pressure and volume are INVERSLY RELATED
Volume and temperature are DIRECTLY RELATED

9. Combined Gas Law The Ideal Gas Law Notes
One gas with variables changing (like P, V, and T)
Remember: If a variable is constant (or not mentioned), you can cross it out of the equation.

10. Dalton’s Law of Partial Pressure
Ptotal = P1 + P2 + P3 +…..
REMEMBER: You may have to first calculate pressure of individual gases BEFORE you can solve

11. Gas Stoichiometry Gas Stoichiometry Practice
Draw the Stoichiometry Islands! (This is a great thing to draw on your test in the first minute!)
Must write & balance the chemical reaction!
When at STP: Stoichiometry ONLY! (yay!!!)
Not at STP: Must use PV=nRT “detour”

12. Equilibrium Equilibrium Notes Unit 9 Equilibrium Review
Equilibrium Expressions K=[Products]/[reactants]
Know how to write/identify these, you do not need to do any math
Le Chatelier’s Principle (know how equilibrium shifts left or right if…)
Add/Remove Reactant
Add/Remove Product
Add/Remove heat (endothermic or exothermic)
Increase/Decrease Pressure
Increase/Decrease Volume