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T2 CH 3 Changes Around Us — Science STD 7 — Question

Tamilnadu BoardEnglish MediumSTD 7ScienceT2 CH 3 Changes Around Us2 Marks
Question
Distinguish physical and chemical changes.
✓

Answer

1. Physical changes:
  1. No new substance is formed
  2. Reversible
  3. Change in physical properties like size, shape, state
  4. Melting of ice, tearing of paper freezing, evaporation vaporization
2. Chemical changes:
  1. New substance is formed
  2. Irreversible
  3. Change in properties of reactants and products
  4. Burning of paper, photosynthesis, digestion of food, rusting of iron

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