explain why burning of wood and cutting into small pieces are considered as two different types of changes
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It is said that burning of wood and cutting it into small pieces are different types of changes because when we burn the wood, combustion takes place and combustion is a chemical process but on cutting it into small pieces, no chemical properties are changed and hence, cutting it into small pieces is not a chemical change(i.e., it is a physical change).
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Burning of wood produces ash and smoke. Hence the properties of wood are changed and new substances are formed. So, it is a chemical change.
When a log of wood is cut into small pieces, there is no new substance formed. Each small piece bears the properties of wood. So, it is a physical change. Obviously, burning and cutting of wood are two different type of changes.
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