Send your chemistry students to Holly Phaneuf's blog. As she says, "I love chemistry questions! I won't do your homework for you, but I will help you visualize the problem and give you some logic to help solve it yourself."
I particulary enjoyed reading about the experiment where Holly and her husband try to figure out why pepper floats in a bowl of water but when a bar of soap is inserted, the pepper immediately moves to the edges of the bowl. I had to get up and try it myself. Go to her blog for the answer.
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