Since Expt. 9 was shortened there is not much to talk about. Make sure your students use the disposable test tubes the stockroom put out instead of their own for Part A, since it's almost impossible for the students to clean the test tubes afterward. Also, remind your students to not make the poly(ethylene oxide) gel. Make one demo beaker of the gel and pass it around to all the students in the lab.
Also remind them to not burn the plastic on the clamps...
Try to stagger what part your students start on, since the lines for the density part of the experiment were long towards the end.
This lab goes quickly, especially since they don't do a lot of the questions.