Summary
Daniel distinguishes physical changes (size, shape — reversible) from chemical changes (new substance formed — usually irreversible). Uses examples: cutting wood, melting ice, burning paper, rusting iron. Clear signal words help students classify each type.
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Teaching resources
Discussion questions
Discussion
Matter can change physically (same substance, different form) or chemically (new substance).
- Is melting ice a physical or chemical change? How do you know?
- What are three signs that a chemical change has occurred?
- Is baking a cake physical or chemical? Can you reverse it?
Quick work-a-long
Vocabulary: physical change, chemical change, matter, reversible, irreversible, substance, reaction.
Try it: List 10 everyday events (burning toast, tearing paper, dissolving sugar, rusting a nail…). Sort them into physical or chemical. Justify each.