The third lesson in a series of 11 begins by using thermal decomposition of potassium chlorate to determine the mass percent of oxygen. Then a second activity allows scholars to demonstrate that the resulting residue is from a decomposition reaction.

Concepts

decomposition reactions, chemical reactions, the law of conservation of mass, precipitates

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Additional Tags

science

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Instructional Ideas

• Have a sample setup completed at the front of the room for pupils to reference

Classroom Considerations

• Follow all safety guidelines with open flames, hot equipment, and chemicals
• Some chemicals used may stain the skin, burn the skin, burn the eyes, or splash and stain surfaces

Pros

• Includes all equations used in the experiment
• Provides a pre-lab worksheet that verifies learners have read the instructions completely before beginning

Cons

• None

Common Core

RST.9-10.3 RST.9-10.4