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With the Now You See It—Now You Don’t Oscillating Chemical Reaction Demonstration Kit, pretend magical powers cause the color of a solution to alter. The color of the solution will oscillate about every 35 seconds for one-half hour.

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Amaze your students! Pretend you have magical powers that can cause the color of a solution to alter between orange and colorless. Simply add three white solids to a colorless solution and presto—the solution turns orange, then colorless and orange again. The color of the solution will oscillate approximately every 35 seconds for one-half hour or more. A magnetic stirrer is highly recommended. Teacher Demonstration Notes included.

Concepts: Oscillating reactions, reaction mechanisms.
Time Required: 20 minutes
Note: Perform this demonstration in a fume hood or well-ventilated lab.

Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Asking questions and defining problems
Developing and using models
Engaging in argument from evidence
Constructing explanations and designing solutions

Disciplinary Core Ideas

MS-PS1.A: Structure and Properties of Matter
MS-PS1.B: Chemical Reactions
HS-PS1.A: Structure and Properties of Matter
HS-PS1.B: Chemical Reactions
HS-PS2.B: Types of Interactions

Crosscutting Concepts

Patterns
Cause and effect
Scale, proportion, and quantity
Stability and change

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.
MS-PS1-5. Develop and use a model to describe how the total number of atoms does not change in a chemical reaction and thus mass is conserved.
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.
HS-PS1-7. Use mathematical representations to support the claim that atoms, and therefore mass, are conserved during a chemical reaction.