Classify the following changes as physical and chemical changes: digestion of food, making sugar syrup, burning of wood, cutting of fruits, boiling of egg, grinding wheat into flour, and stitching fabric into garments.

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Solution

Physical Changes Chemical Changes

Making sugar syrup Digestion of food

Cutting of fruits Burning of wood

Grinding of wheat into flour Boiling of egg

Stitching fabric into garments

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Question 16

Classify the following processes into physical or chemical changes:

(i) Beating of aluminium metal to make aluminium foil.
(ii) Digestion of food.
(iii) Cutting of a log of wood into pieces.
(iv) Burning of crackers.

Classify the following as chemical or physical changes:

• Cutting of trees

• Melting of butter in a pan

• Rusting of almirah

• Boiling of water to form steam

• Passing of electric current through water, and water breaking down into hydrogen and oxygen gas

• Dissolving common salt in water

• Making a fruit salad with raw fruits

• Burning of paper and wood

Classify the changes involved in the following processes as physical or chemical changes:

(a) Photosynthesis

(b) Dissolving sugar in water

(d) Melting of wax

(e) Beating aluminium to make aluminium foil

(f) Digestion of food

Classify these changes into physical and chemical changes. [5 MARKS]

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Physical Changes	Chemical Changes
Making sugar syrup	Digestion of food
Cutting of fruits	Burning of wood
Grinding of wheat into flour	Boiling of egg
Stitching fabric into garments