Question

Classify the following as physical or chemical changes:

(i) Cooking of food (ii) Boiling of water

(iii) Cutting of trees (iv) Dissolving salt in water

(v) Digestion of food (vi) Melting of ice

Answer 1

i)Cooking of food -Chemical change
ii)Boiling of water to form steam - Physical change
iii)Cutting of trees - Physical change
iv)Dissolving common salt in water - Physical change
v)Digestion of food -Chemical change