Summary
Goes deeper into chemical changes: what happens at the particle level when substances react, what the signs of a chemical reaction are, and why the new substances formed are different from the starting materials.
Viewer safety
All ages
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Teaching resources
Discussion questions
Discussion
- List three observable signs that a chemical change has occurred.
- At the particle level, what actually changes during a chemical reaction?
- Why is burning wood a chemical change but cutting wood a physical change?
- Is digestion a physical change, a chemical change, or both? Explain.
Quick work-a-long
Vocabulary: chemical reaction, reactant, product, evidence, particles, irreversible.
Try it: List five everyday chemical changes (rusting, burning, cooking an egg, bread rising, leaves changing color). For each, identify one piece of observable evidence that it is a chemical — not physical — change.