Question

explain why burning of wood and cutting it in to small piece are considered as two different types of changes

Answer 1

burning of wood is a chemical change because in burning new substances are formed as

Wood + Oxygen —> Charcoal + Carbon dioxide + Heat + Light  

But cutting it into small pieces is physical change because no new substance is formed. We can only reduce the size of wood

Answer 2

Answer:

Burning of wood − chemical change because a new substance is formed.

wood+O 2 ⟶Ashes+CO 2 +△+light (heat)

Whereas cutting into small pieces is a physical change because there is no change in the composition of the substance and no new substance is formed.

Only the size is reduced.