Explain why burning of wood and cutting it into small pieces are considered as two different types of changes.
Class 7CBSEScienceChapter: Physical and Chemical Changes
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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 reaction. 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’s a physical change. Obviously, burning and cutting of wood are two different types of changes.