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Question

Is wood burning a physical or chemical change?


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Solution

Physical change:

  • In a physical change, the molecules of a substance are rearranged but the composition of the substance remains constant.
  • Physical change is reversible which means that the original can be recovered.

Chemical changes:

  • In a chemical change, the molecular composition of a substance is completely changed and it gives rise to a new substance.
  • Chemical changes are irreversible which means that the original cannot be recovered.

Wood burning:

  • When wood is set on fire, the Carbon present in the form of Methane or butane combusts in the presence of Oxygen to form water and Carbon dioxide.
  • The burning of wood is a chemical change as it leads to the formation of new substances like Carbon dioxide gas, water vapour, ash, etc.
  • There are some substances that do not undergo complete combustion or do not react at all, these substances form the fire ash.

Therefore, the wood-burning is a chemical change.


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