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Making liquids of different densities to perfectly lay on top of each other can be a frustrating exercise. The Exploratorium created this activity as a fool proof way of making a density column.

1 cent - $1 per student Ages 6 - 18 5 to 10 minutes
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In this chemistry activity (page 1 of the PDF), learners will observe a physical change.

$1 - $5 per student Ages 6 - 14 1 to 4 weeks
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In this simple activity (on page 2 of the PDF), learners make a crystal garden using salt, water, and a brick.

$1 - $5 per student Ages 6 - 14 1 to 7 days