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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.

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. Correct Answer Both processes A and B are chemical changes.

Concept:

Chemical changes: 

  • It takes place at the molecular level.
  • In this type of changes, new substances are produced.
  • chemical change accompanies chemical reaction.
  • Examples: Combustion, cooking an egg, rusting of an iron pan.

Physical changes:

  • It is concerned with energy and states of matter.
  • In this type of change, new substances are not produced (although there is a difference of view in starting and ending material.
  • Examples: Changes in State or phase (melting, freezing, vaporization, condensation, sublimation).
  • Crushing a can, melting an ice cube, and breaking a bottle are the examples of Physical changes.

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Explanation:

  • Anaerobic bacteria digest animal waste and produce biogas (Change – A) - Chemical reaction
  • As animal waste got converted into biogas (here new substance is formed ) so it is a chemical change
  • The biogas is then burnt as fuel (Change – B) - Chemical Reaction
  • Biogas is burnt as a fuel here the chemical reaction is taking place i.e. Combustion.
  • Hence Both processes A and B are chemical changes.

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