Fill in the blanks :
(a) The process of a liquid changing into a solid is called _.
(b) A change which alters the composition of a substance is known as change.
(c) There is no change in the of the substance during a physical change.
(d) The reaction in which energy is evolved is called ____.

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Solution

(a) The process of a liquid changing into a solid is called freezing. [1 mark]
(b) A change, which alters the composition of a substances, is known as a chemical change.[1 mark]
(c) There is no change in the composition of the substance during a physical change.[1 mark]
(d) The reaction in which energy is evolved is called exothermic reaction.[1 mark]

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