In Chapter 2 of the Tech in the Secondary Science Classroom there are a listing of good web resources for using Digital Video. I tried out this one on Chemistry, it's called Chemistry Comes Alive. They have great videos for some of the more hazardous or intangible chemistry concepts. This was a cool one that shows a phenomenon I'd never heard about wherein a mercury droplet can be made to pulsate like a beating heart. Too cool. Anyway, most of the videos have a text explanation of the chemical concept being demonstrated. This particular video also had targeting questions to get the students thinking and to convey their understanding about what they observed.
http://jchemed.chem.wisc.edu/jcesoft/cca/pirelli/pages/cca3heart.html
P.S. I tried to screencast this video, but the resulting video was too large (75 mb). Not sure why. So I aborted that attempt.
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