Classify the following as physical or chemical changes:
melting of ice, burning of agarbatti, tearing of clothes, cooking of food, formation of clouds, formation of seeds from flowers, drying of wet clothes, formation of curd from milk, burning of cooking gas, dissolution of sugar in water, hammering of metals to form sheets, melting of wax, melting of butter, digestion of food, lightning in the sky, explosion of fire crackers.

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Solution

A change in which no new substance is formed is called a physical change. It is a temporary change and is reversible.
A chemical change is a permanent change in which an entirely new substance is formed with different properties.
CHEMICAL CHANGES
PHYSICAL CHANGES
burning of agarbatti drying of wet clothes
cooking of food the hammering of metals to form sheets
formation of seeds from flowers melting of wax
explosion of fire crackers. melting of butter
formation of curd from milk melting of ice
burning of cooking gas formation of clouds
digestion of food tearing of clothes
lightning in the sky dissolution of sugar in water

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Similar questions

Q. 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.

Classify the following as a physical or a chemical change :

(a) Drying of wet clothes

(b) Manufacture of salt from seawater.

(d) Boiling of water

(e) Burning of paper

(f) Melting of wax

(g) Burning of coal

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

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 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

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CHEMICAL CHANGES	PHYSICAL CHANGES
burning of agarbatti	drying of wet clothes
cooking of food	the hammering of metals to form sheets
formation of seeds from flowers	melting of wax
explosion of fire crackers.	melting of butter
formation of curd from milk	melting of ice
burning of cooking gas	formation of clouds
digestion of food	tearing of clothes
lightning in the sky	dissolution of sugar in water