Questions of Physical Changes - Questions at the end of the chapter - Chapter 5 Class 7 - Changes Around Us: Physical and Chemical (Curiosit

Last updated at April 25, 2026 by

Q1 (Easy): Which of the following statements are the characteristics of a physical change? (i) The state of the substance may or may not change. (ii) A substance with different properties is formed. (iii) No new substance is formed. (iv) The substance undergoes a chemical reaction. (a) (i) and (ii) (b) (ii) and (iii) (c) (i) and (iii) (d) (iii) and (iv)

Answer:
We have studied that physical changes only change appearance but no new substance is formed. This is why option (c) is correct.

  • Statement (i) is correct - state can change
  • Statement (iii) is correct - no new substance forms
  • Statement (ii) is wrong - same substance remains
  • Statement (iv) is wrong - no chemical reaction happens
Physical vs Chemical Changes Property Physical Changes Chemical Changes New substance No new substance New substance forms State change May or may not change Usually changes Chemical reaction No reaction Chemical reaction occurs Reversibility Usually reversible Usually irreversible

Q5 (Medium): Are the changes of water to ice and water to steam, physical or chemical? Explain.

Answer:
We have studied that physical changes only change state but same substance remains. This is why both are physical changes.

  • Water to ice - only state changes to solid
  • Water to steam - only state changes to gas
  • Same substance H₂O in all three states
  • No new substance is formed in either case
Water State Changes Ice (Solid) H₂O molecules tightly packed Water (Liquid) H₂O molecules loosely packed Steam (Gas) H₂O molecules freely moving Same substance - only state changes!
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