Physical Change
The substance remains the same.
Can be undone (e.g., melting ice).
The composition remains unchanged.
Solid to liquid or gas (e.g., water boiling).
May involve heating or cooling (e.g., melting butter).
Chemical Change
A completely new substance is produced.
Cannot be undone easily (e.g., burning wood).
New bonds form (e.g., rusting iron).
Heat, light, or gas is produced (e.g., combustion).
Color change, gas formation (e.g., vinegar and baking soda reaction)
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