At equilibrium, the concentrations of reactants and products are related in a mathematical formula that produces a constant value.  Consult the text, p.439-448 and p.463-464.
Homework:  p.445 #5, 6; p.449 #3, 4, 8, 9; p.465 #1, 2

We performed the experiment "Testing Le Chatelier's Principle" from p.514-517 in the text. 
Homework:  p.459 #2, 3, 5, 6, 8a, 10

Due to disruptions caused by a fire, and due to difficulties preparing for this experiment, we used the class time to complete the preparation for the lab, which we will perform tomorrow.  When finished students did Lab Exercise 7.2.1 on p.514 in the text.