Question

Q3.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)Beating alumunium to make aluminium foil
e)Digestion of food ​

Answer 1

Answer:

Chemical changes:

• Photosynthesis.
• burning of coal.
• digestions of food.

Physical changes:

• Beating alumunium to make aluminium.
• Dissolving sugar in water.

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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