In this lesson students are practicing what they have learned about Le Chatelier's Principle to perform partner practice and a mini quiz.
For this lesson each pair of students needs either a whiteboard or a Le Chatelier's practice paper.
I begin this lesson by reviewing the homework that students had two lessons previously (Equilibrium and Le Chatelier's Principle).
Normally homework is due the next day, but many students had problems with Le Chatelier's principle so I gave them an additional day to get the homework done. What I did was give students a stamp if they had it done the day it was due but made it an extra credit stamp, and then gave students the extra day to get it done so students who had it done this second day also were able to earn a stamp for full credit.
Because a lot of students had a hard time with this homework I did not just put up the answer key, which I often do, but rather used a blank paper and went through each of the answers with students. This movie shows how I did this with one of the problems.
Here is a copy of one student's completed homework.
This is a copy of the answer key.
In this section of the lesson I have students do practice of Le Chatelier's Principle with a partner. This activity is similar to when I use the strategy of Whiteboard Practice, but instead of whiteboards I have students use a prelabeled paper.
As a way to conclude this lesson and to make sure that students are getting Le Chatelier's Principle I have them do a quick mini quiz.
The quiz consists of 3 questions, one in which the stress is a change in concentration, one for pressure, and one for temperature.
I collect the quiz and quickly grade using the Unit 9 quick quiz key.
For the most part students do well on the quiz. The question that students struggled the most with was the pressure one.
Because so many students did poorly on the pressure question I made sure to review how to determine shifts when there are changes in pressure. Also I made a point to make sure that there were multiple pressure questions on the Unit 9 Review.