Learn more at http://www.stevespanglerscience.com/experiment/iodine-clock-reaction Two clear liquids are mixed together and the audience is told to watch closely... "Don't take your eyes off the liquid or you'll miss it!" Then, in a flash, the water changes to ink (or so they think!). Clock reactions like this never fail to capture the student's attention, and the Iodine Clock Reaction is one of the most startling chemical demonstrations you'll ever see. "How did that happen?" is almost always the reaction, and when students ask "How?", they're ready to learn.
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