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Classify each of the following, as a phy...

Classify each of the following, as a physical or a chemical change. Give reasons.
(a) Drying of a shirt in the sun.
(b) Rising of hot air over a radiator.
(c) Burning of kerosene in a lantern.
(d) Change in the colour of black tea on adding lemon juice to it.
(e) Churning of milk cream to get butter.

Text Solution

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(a) It is a physical change. Moisture or water drops present on the shirt will evaporate or change into vapours.
(b) It is a physical change. On cooling, the level of air over the radiator will fall.
(c ) It is a chemical change. The hydrocarbons present in kerosene will react chemically with oxygen to form new products.
(d) It is a chemical change. The acid present in lemon juice will react the constituents (e.g. caffeine) present in black tea.
(e) It is a physical change. However, butter will not change to milk so easily.
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