As a culminating activity to their year of chemistry, 7th grade made "elephant toothpaste."
Using potassium iodide as a catalyst, hydrogen peroxide is rapidly broken down into water vapor and oxygen, trapping the gases in dish soap. The result is a column of foam that some think looks like toothpaste being squeezed from a giant tube!
Many thanks to alum Joshua Cope '83 for all the help!
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