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The Overhead Oscillating Clock—Chemical Demonstration Kit

By: The Flinn Staff

Item #: AP2089

Price: $30.35

The Overhead Oscillating Clock Chemical Demonstration Kit is easily performed on an overhead projector. Simply place a Petri dish on the overhead, add solutions and mix. Students are captivated due to the colorful, unpredictable changes.

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This item can only be shipped to schools, museums and science centers

Product Details

Oscillating clock reactions are captivating due to their colorful and unpredictable changes. This variation of a classic oscillating reaction is easily performed on an overhead projector. Simply place a Petri dish on the overhead, add three solutions and mix. In a short while blue dots appear on an orange background. The blue dots expand, new dots appear, and the dish is filled with concentric blue rings spreading through a sea of orange. The reaction continues for 30 minutes and can be restarted by simply swirling the dish. Teacher Demonstration Notes are included.

Concepts: Oscillating reactions, oxidation–reduction, reaction mechanisms.
Time Required: 30 minutes
Chemicals Provided: Acidified sodium bromate solution, malonic acid solution, sodium bromide solution, ferroin solution.