What are physical and chemical change properties class 7?
Answer (1)
26th Jul, 2022
Physical Change
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The substance remains the same.
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Can be undone (e.g., melting ice).
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The composition remains unchanged.
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Solid to liquid or gas (e.g., water boiling).
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May involve heating or cooling (e.g., melting butter).
Chemical Change
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A completely new substance is produced.
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Cannot be undone easily (e.g., burning wood).
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New bonds form (e.g., rusting iron).
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Heat, light, or gas is produced (e.g., combustion).
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Color change, gas formation (e.g., vinegar and baking soda reaction)
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