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Question 11 Which of the following are chemical changes?
(a) Growth of a plant
(b) Rusting of iron
(c) Mixing of iron fillings and sand
(d) Cooking of food
(e) Digestion of food
(f) Freezing of water
(g) Burning of candle

Class 9 - Science - Is Matter Around Us Pure Page 30

Answers

Answered by AkashMandal
247
Following are the chemical changes :-

◆ Growth of a plant .

◆ Rusting of Iron.

◆ Cooking of food.

◆ Digestion of food.

◆ Burning of a candle.

Answered by rahul123437
0

Option (a),(b),(d),(g) are the correct answer

Growth of a plant, rusting of iron, cooking of food, digestion of food, and burning the candle are chemical changes.

Explanation:

  • A chemical change is the change which occurs between the reactants to form products and this results in a chemical reaction.
  • A physical change is when matter changes  its forms but there exist no chemical identity and only physical parameters are affected.
  • When chemical composition is changing, then it is supposed to be a chemical change.
  • When the chemical composition is remaining the same, then it is a physical change.
  • Growth of a plant, rusting of iron, cooking of food, digestion of food, and burning the candle are chemical changes
  • As there chemical composition of the substance changes in all the given compound.

#SPJ3.

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