1. December 4, 2013
In your assigned seat working on the Do Now when the bell rings. IF I CANNOT HEAR THE MUSIC YOU ARE TOO LOUD. Turn in HW #4 (quiz grade). Turn in any late HW, Projects, etc. Pick up a White board, sock, and marker. DO NOW: Complete the warm up you picked up (quarter sheet). This will be collected.

2. The answers are …
Element
Atomic #
Atomic Mass
Protons
Neutrons
Electrons Mg 12 24 A B C P 15 D E 16 F K G 39 H I 19 12 12 12 31 15 15 19 19 20

3. Tutoring
Thursday 12-5 afterschool 2:30-3:30

4. Homework
Vocab column #1 * Post Lab Questions due Friday * *graded

5. Week of
12-2: Solutions Test 12-3: Equilibrium (HW: #4) 12-4: Equilibrium, Lab, Gas Laws intro (HW: Vocab #1, Lab questions due Friday) 12-5: Gas Laws (HW: Vocab #2, Study) Equilibrium Quiz 12-6: Energy/Thermochem Test Gas Laws (HW: Vocab #3, Solutions Test Corrections)

6. Agenda 12-3 Do Now House keeping Equilibrium Wrap Up
Equilibrium Practice
Ice Cream Lab
Intro to Gas Laws Video

7. Objectives
Infer the shift in the equilibrium when a stress is applied to a chemical system ( Le Chatelier’s Principle)

8. Occurs when the rate of the forward reaction is equal
Equilibrium
Occurs when the rate of the forward reaction is equal
to the rate of the backward reaction

9. Equilibrium Constant (Keq)
A measure of how far a reaction goes to the right

10. [ ] = concentration

11. Keq > 1 More products than reactants Keq < 1 More reactants than products

12. Once a reaction reaches equilibrium can it ever change??
YES!!! All it takes is a change in either the forward or reverse rates.

13. (and therefore changes
What changes rxn rate
(and therefore changes
the equilibrium):
Concentration
Pressure
Temperature

14. Le Chatelier’s Principle
If changes are made to
a system in equilibrium,
the RXN will shift in
the direction that will
reduce the change

15. Concentration If substance is added, the rxn will shift away from
that side;
If substance is removed, the rxn will shift towards that side

16. If pressure is increased, the rxn will shift to the
side that will produce
fewer molecules
(compare moles of gas)

17. Increased temp will shift the rxn to the side that absorbs heat
Temperature
Increased temp will shift the rxn to the side that absorbs heat

18. Equilibrium Practice

19. We all Scream for Ice Cream
Get into groups
5 minutes to read through intro
2 pre-lab questions
Lab with partners
BE SURE TO RECORD ANY DATA
If you finish early start working on post-lab questions.
POST LAB QUESTIONS ARE DUE FRIDAY

20. Intro to Ideal Gas Laws
Before : 1 thing you know from kinetics and equilibrium about gases During: 3 bullet points (most important) After: 1 thing you are excited to learn more about from the video

21. Exit Ticket
1. Ammonia is produced commercially by the Haber reaction: N2(g) + 3 H2(g) ↔ 2 NH3(g) + heat The formation of ammonia is favored by (A) an increase in pressure (B) a decrease in pressure (C)removal of N2(g) (D)removal of H2(g) 2. Given the reaction at equilibrium: 2 SO2(g) + O2(g) ↔ 2 SO3(g) + heat Which change will shift the equilibrium to the right? (A) increasing the temperature (B) increasing the pressure C)decreasing the amount of SO2(g) (D)decreasing the amount of O2(g)
3rd
4th