Classify the following as slow or fast change:
(i) Bearing of heat
(ii) Change of seasons
(iii) Burning of paper
(iv) Weathering of rocks
(v) Melting of wax
(vi) Cooking of food
(vii) Burning of wax
(viii) Melting of ice cream
(ix) Curdling of milk
(x) Formation of day and night.

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Solution

(i) Bearing of heat - fast
(ii) Change of seasons - slow
(iii) Burning of paper- fast
(iv) Weathering of rocks- slow
(v) Melting of wax- fast
(vi) Cooking of food- slow
(vii) Burning of wax- fast
(viii) Melting of ice cream-fast
(ix) Curdling of milk- slow
(x) Formation of day and night- slow.

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Question 4

(c) Classify the following processes into physical or chemical changes.
baking of bread, switching of an electric bulb, curdling of milk, dissolving sodium chloride in water, photosynthesis, rusting of iron, evaporation of water, formation of dew, sublimation of camphor, burning of charcoal or LPG, clotting of blood, crystallization of sugar, ripening of fruit, cooking of vegetables, melting of wax.

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

S.No	Change
1	Melting of Ice
2	Dissolving sugar in water
3	Burning rubber
4	Burning camphor
5	Melting Wax

Q. Group the following into physical change and chemical change.

Dissolving salt in

H_{2} O,

burning of a fuel, rusting or iron, melting of ice cube.

Classify the following examples into physical or chemical change. [1 MARK]

1) Photosynthesis and burning of coal

2) Dissolving sugar in water and melting of wax

Q. Classify the following into slow and fast changes:
(i) Spinning of top
(ii) Formation of day and night
(iii) Formation of curd from milk
(iv) Change of season
(v) Making curd from milk by adding lemon juice.

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Classify the following as slow or fast change:(i) Bearing of heat(ii) Change of seasons(iii) Burning of paper(iv) Weathering of rocks(v) Melting of wax(vi) Cooking of food(vii) Burning of wax(viii) Melting of ice cream(ix) Curdling of milk(x) Formation of day and night.

(i) Bearing of heat - fast(ii) Change of seasons - slow(iii) Burning of paper- fast(iv) Weathering of rocks- slow(v) Melting of wax- fast(vi) Cooking of food- slow(vii) Burning of wax- fast(viii) Melting of ice cream-fast(ix) Curdling of milk- slow(x) Formation of day and night- slow.

Classify the following as slow or fast change:
(i) Bearing of heat
(ii) Change of seasons
(iii) Burning of paper
(iv) Weathering of rocks
(v) Melting of wax
(vi) Cooking of food
(vii) Burning of wax
(viii) Melting of ice cream
(ix) Curdling of milk
(x) Formation of day and night.

(i) Bearing of heat - fast
(ii) Change of seasons - slow
(iii) Burning of paper- fast
(iv) Weathering of rocks- slow
(v) Melting of wax- fast
(vi) Cooking of food- slow
(vii) Burning of wax- fast
(viii) Melting of ice cream-fast
(ix) Curdling of milk- slow
(x) Formation of day and night- slow.