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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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Product Details

Oscillating clock reactions are captivating due to their colorful and unpredictable changes. This variation on a classic 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.

Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Analyzing and interpreting data
Constructing explanations and designing solutions

Disciplinary Core Ideas

MS-PS1.A: Structure and Properties of Matter
MS-PS1.B: Chemical Reactions
HS-PS1.B: Chemical Reactions

Crosscutting Concepts


Performance Expectations

MS-PS1-2. Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.
HS-PS1-2. Construct and revise an explanation for the outcome of a simple chemical reaction based on the outermost electron states of atoms, trends in the periodic table, and knowledge of the patterns of chemical properties.