Explain why burning of wood and cutting it into small pieces is considered as two different types of changes.
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Burning of wood is a chemical change while cutting of wood is a physical change because during burning, new substances are formed. After burning, we cannot get original substance, (i.e. wood) back. Cutting of wood into small pieces is a physical change because no new substance is formed.
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Burning of wood and cutting of wood into small pieces are two differents of changes. While burning of wood, ash is produce which cannot be converted back into wood. So, it is an irreversible. change and chemical change. But when we cut wood only its shape and size changes, no new substance is formed thus, it is a physical change .
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