NCERT Question 11 - Chapter 2 Class 9 - Is Matter Around Us Pure

Last updated at Dec. 16, 2024 by

Which of the following are chemical changes?

(a) Growth of a plant

(b) Rusting of iron

(c) Mixing of iron filings and sand

(d) Cooking of food

(e) Digestion of food

(f) Freezing of water

(g) Burning of a candle.

 

Answer

Physical Change - A change in which no new substance is formed is called Physical Change

These changes are reversible.

 

 

Chemical Change - A change in which new substances are formed is called Chemical Change

These changes are normally irreversible

 

The following are chemical changes

  • (a) Growth of a plant
  • (b) Rusting of iron
  • (d) Cooking of food
  • (e) Digestion of food
  • (g) Burning of a candle.

 




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