Question

1 Classify the changes involved in the following processes as physical or chemical changes:
(a) Photosynthesis
(b) Dissolving sugar in water
(c) Burning of coal
(d) Melting of wax
(e) Beating aluminiun to make aluminium foil
(f) Digestion of food
State whether the following statements are true or false in case a​

Answer 1

Answer:

a) Chemical change.

b) Physical change.

C) Chemical change.

d) Physical change.

e) Physical change.

f) Chemical change.

Explanation:

Physical changes are the changes in which we can recover or retrieve the source or the main object.

Chemical changes are irreversible changes. Once done, we can't get the source or the main object.

Answer 2

Answer:

(a) Photosynthesis → Chemical change

(b) Dissolving sugar in water → Physical change

(c) Burning of coal → Chemical change

(d) Melting of wax → Physical change

(e) Beating aluminium to make aluminium foil → Physical change

(f) Digestion of food → Chemical change

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