Classify the following changes into fast and slow changes:

Explosion of a cracker, tooth decay, growth of a plant, fading of flowers, burning of cooking gas, taking x-ray photograph of a body part

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Solution

Slow changes: tooth decay, growth of a plant, fading of flowers.

Fast changes: burning of cooking gas, taking x-ray photograph of a body part

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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.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

Question 5.

Classify the following changes into fast and slow changes:

Explosion of a cracker, tooth decay, growth of a plant, fading of flowers, burning of cooking gas, taking x-ray photograph of a body part

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