3. Give two examples for each of the following cases:
(a) Physical changes which are reversible.
(b) Physical changes which are not reversible.
(c) Chemical changes.
(a) Physical changes which are reversible.
(b) Physical changes which are not reversible.
(c) Chemical changes.
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Answer:
(a) Physical changes which are reversible.
(i) Folding of paper
(ii) Melting of ice.
(b) Physical changes which are not reversible.
(i) Tearing of paper.
(ii) Breaking of glass.
(c) Chemical changes.
(i) Reaction between vinegar and baking soda.
(ii) Burning of a match
Answer:
a.Physical changes which are reversible- pencil drawings on white sheet
b.Physical changes which are not reversible-breaking of toy cars
c.Chemical changes-burning of paper