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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.
Correct answer: (iii) Both processes A and B are chemical changes.
Explanation: Anaerobic bacteria digest animal waste and produce biogas. This means a new product is formed that is biogas at the end of the reaction.
animal waste → biogas
Hence, change A is a chemical change.
In change B, biogas is burnt as fuel, and energy is produced as a new product.
fuel → energy + ash
Hence, change B is also a chemical change.
[Extra information: The change in which chemical properties of the matter change is known as chemical change. During a chemical reaction, the chemical bonds between the molecules are broken and rearranged, and new bonds are formed resulting in the formation of new compounds.
Properties of chemical change are as follows:
1. Chemical changes are irreversible. The original form of the matter cannot be attained.
2. It is a permanent change and one or more new substance is formed.
3. During a chemical change, energy is produced in the form of heat, light or sound, while during a chemical reaction, energy is either absorbed or released.
4. Chemical change causes changes in the physical and chemical properties of the substance.]
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