In this lesson students are practicing what they have learned about Le Chatelier's Principle through performing a lab activity.
For this lesson each group of students needs the following resources for their lab:
To begin this lesson I introduce students to the lab where they will be determining what stressors can be used to make the equilibrium reaction involving the formation of copper (II) complexes shift to give additional product. I then help students with the prelab questions.
In this section of the lesson students are actually performing their lab with their cooperative groups.
After students have turned in their labs I grade them using the Le Chatelier's lab rubric.
As I graded the labs most students get their points for the prelab as that we reviewed it as a class.
Where I found that students got the most confused was with dealing with the control in the data and analysis sections. Also, not all students wrote complete conclusions.
These are several examples of students labs which demonstrate the variety which I received in my classes:
Based on these labs I realize that for next time I do this lab I will need to make sure to really explain the purpose of the control to students as a means to compare the results of the 5 tests. In the future I think that I will put an X in the column for control so that students realize that they should not be writing anything in that column. This is a revised version of the lab.
For the final part of this lesson students are working on their unit 9 review. Rather than giving an exam at the end of this unit, I have students take a big quiz, and then move onto Unit 10. They are then tested on both Unit 9 and Unit 10 at the same time.
The review is due at the next class where I stamp for completion and then review the answers with students. This is an example of one student's completed review.
For the most part students did well on the review. The biggest confusions were where to place the activated complex (we did not discuss it that much in class), how to determine which of the lines are reactants/products on the graph at the bottom of the first page, and how to figure out what happens to the concentration of a reactant/product with equilibrium shifts on the last part of the second page.