SCIENCE
PHYSICAL SCIENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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water boils
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water freezes
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ice sinks
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ice melts
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Detailed explanation-1: -Final answer: Hence, option (D) is correct. The decay of matter is not a physical change.
Detailed explanation-2: -The burning of wood is not a physical change because new substances like carbon dioxide and water vapour are formed along with heat and light. In the other cases like cutting of wood, breaking of glass and melting of gold, no new substance is formed.
Detailed explanation-3: -When liquid water (H2O) freezes into a solid state (ice), it appears changed; However, this change is only physical as the the composition of the constituent molecules is the same: 11.19% hydrogen and 88.81% oxygen by mass.
Detailed explanation-4: -Physical changes are limited to changes that result in a difference in display without changing the composition.