1. 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.
Answers
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a, b are the physical change
c, d, f are chemical change
c, d, f are chemical change
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Explanation:
A change that results in the formation of a new compound due change in the chemical composition of reactant molecules is known as a chemical change.
Whereas a change that does not lead to the formation of a new compound is known as a physical change.
Given changes are classified as follows.
(a) Drying of a shirt in the sun : Physical change
(b) Rising of hot air over a radiator : Physical change
(c) Burning of kerosene in a lantern : Chemical change
(d) Change in the colour of black tea on adding lemon juice to it : Chemical change
(e) Churning of milk cream to get butter : Chemical change
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