SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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physical change
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chemical change
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neither
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None of the above
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Detailed explanation-1: -The burning of paper and wood is known as an example of a chemical change. Because here, on heating paper or wood, ash is obtained which has a different chemical composition than that of paper or wood.
Detailed explanation-2: -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.
Detailed explanation-3: -Cutting logs of wood into small pieces is a physical change because no new substance is produced or formed. Burning of wood, Ripening of fruit, and Cooking of food are chemical changes because a new substance is formed in them and they are not reversible.
Detailed explanation-4: -When wood is burned, there is the production of carbon dioxide, water vapour and ash. It is a chemical reaction.
Detailed explanation-5: -Burning is a chemical change as new substance is formed with new properties and it cannot be reversed.