Question

2. Classify the following into reversible and irreversible changes.
Burning of cooking gas, Ripening of fruits, Conversion of water into ice, Preparation of curd from milk,
Folding of paper.
3. Tick () the changes which can be reversed and cross (X) the others.
(a) Baby
Adult boy
(b) Ice
Water
(c) Clay
Pot
(d) Seed
Plant
4. Mention the changes that can be caused by heating.
5. Mention two changes caused by force.
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Answer 1

Answer: Reversible changes:1.conversion of water into ice

2.folding the paper

Irreversible changes:1.Burning of cooking gas.

2.ripening of fruit.

3.preparation of curd from milk.