1
Physical vs Chemical Changes
Classify changes by reversibility, new substance formation and property changes.
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Physical and Chemical Changes
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2
Recognizing Physical Changes
Explain cutting, melting, freezing, dissolving and stretching as physical changes where appropriate.
3
Evidence of Chemical Change
Use colour change, gas formation, heat/light, precipitate or new substance formation as evidence.
4
Rusting of Iron
Connect oxygen, water, iron and prevention methods such as painting, oiling and galvanisation.
5
Crystallisation Process
Explain how crystals form from solutions and why crystallisation is useful.
6
Burning and Cooking Changes
Use evidence to explain why burning and cooking often produce new substances.
7
Reversibility and New Substances
Avoid common misconceptions by separating reversibility from new substance formation.
8
Reasoning About Changes
Analyze observations and decide whether a change is physical, chemical or both.
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