SCIENCE
PHYSICAL SCIENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Melting Ice Cream
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Water Freezing
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Burning Wood
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Water Vaporizing
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Detailed explanation-1: -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-2: -The process of burning (as opposed to evaporating) is a chemical reaction, a chemical change.
Detailed explanation-3: -Cutting of wood into small pieces is a irreversible physical change as no new substance is formed and there is no change in chemical composition of wood. Whereas, burning of wood is a chemical change as a new substance is formed.
Detailed explanation-4: -Burning is a chemical change as new substance is formed with new properties and it cannot be reversed.
Detailed explanation-5: -When wood is burned, oxygen and other elements in the air (mainly carbon, hydrogen and oxygen) react to form carbon dioxide that is released into the atmosphere, while the minerals turn into ashes.