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Physical and Chemical Changes
Anaerobic bacteria digest animal waste and produce biogas (Change – A). The biogas is then burnt as fuel (Change – B). The following statements pertain to these changes. Choose the correct one.
(i) Process – A is a chemical change.
(ii) Process – B is a chemical change.
(iii) Both processes A and B are chemical changes.
(iv) None of these processes is a chemical change.
Physical change: A change in which only the physical properties of a substance like a shape, size, position, or physical state change but the chemical composition remains the same is called a physical change. These changes are mostly reversible and temporary.
Chemical change: A change that involves a change in composition and chemical properties of the substance that leads to the formation of a new substance is called a chemical change. These changes are irreversible and permanent.
Anaerobic bacteria digest animal waste and produce biogas. Here the chemical composition of animal waste changes to form a new substance, that is biogas. This means that Change A is a chemical change.
When we burn biogas, its chemical composition changes that lead to the formation of new substances along with heat and light. This means that Change B is a chemical change.
Hence, the correct answer is (iii) Both processes A and B are chemical changes.
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