Thursday, Feb 10 A-day

Honors and Regular - Thermo Test will be Feb 16 and Feb 17. Also due this day are Term Projects and Lab notebook (honors).Parent Teacher Conference Feb 14, Monday 3-7pm

Regular Chemistry -
Starter- Pick up new starter sheet in class.
Lab: 3.6 Equilibrium
Homework: 3.8 Change of State 1
Summary - Also on the new starter paper.

Honors Chemistry -
Starter- Pick up new starter sheet in class.
Lab: 3.6 Equilibrium
Homework: 3.8 Change of State We will correct 3.7 next time also.
Summary - Also on the new starter paper.

AP Chemistry-
Starter - Ka problem
Starter 2.10 AP Question: 2000 Free-Response 1
2H2S (g)↔2H2(g) + S2(g)
When heated, hydrogen sulfide gas decomposes according to the equation above.
A 3.40 g sample of H2S(g) is introduced into an evacuated rigid 1.25 L container. The sealed container is heated to 483 K, and 3.72 × 10-2 mol of S2(g) is present at equilibrium.
(a) Write the expression for the equilibrium constant, Kc, for the decomposition
reaction represented above.
(b) Calculate the equilibrium concentration, in mol L-1, of the following gases in the container at 483 K.
(i) H2(g)
(ii) H2S(g)
(c) Calculate the value of the equilibrium constant, Kc, for the decomposition reaction at 483 K.
(d) Calculate the partial pressure of S2(g) in the container at equilibrium at 483 K.
(e) For the reaction H2(g) + 1/2S2(g) ↔ H2S(g) at 483 K, calculate the value of the
equilibrium constant, Kc.

Lecture: Ksp
Lab: 3.6 Ksp Make sure to print out and read through and be ready to do lab 3.6 on Ksp.
Correct: 3.9
Homework: 3.9

Summary: 2.10 Summary:
Sample AP Question: 1977 Question 6
For the system
2SO2 (g) + O2 (g) <--> 2SO3 (g)

ΔH is negative for the production of SO3. Assume that one has an equilibrium mixture of these substances. Predict the effect of each of the following changes on the value of the equilibrium constant and on the number of moles of SO3 present in the mixture at equilibrium. Briefly account for each of your predictions. (Assume that in each case all other factors remain constant.)
(a) Decreasing the volume of the system.
(b) Adding oxygen to the equilibrium mixture.
(c) Raising the temperature of the system.

Term Test is Feb 14. Yes, I know...Happy Valentine's Day. Lab notebooks will be due that day! Test Next Time - Written portion only. Be prepared! Generally the same kinds of questions as last time.