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
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Following are the chemical changes :-
◆ Growth of a plant .
◆ Rusting of Iron.
◆ Cooking of food.
◆ Digestion of food.
◆ Burning of a candle.
◆ Growth of a plant .
◆ Rusting of Iron.
◆ Cooking of food.
◆ Digestion of food.
◆ Burning of a candle.
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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.
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