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Lava Lamps
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Learners observe working lava lamps to understand how they work (included in PDF link).
Glow Fast, Glow Slow: Alter the Rate of a Reaction!
Source Institutions
Learners investigate one factor affecting reaction rates: temperature. In a darkened room, two identical lightsticks are placed in water -- one in hot water and one in cold water.
Matter of Degree
Source Institutions
In two separate bags, learners mix water with Epsom salts and detergent.