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प्रश्न
Give three reasons why melting of wax, is considered a physical change while burning of a candle, a chemical change.
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उत्तर
Melting of wax is a temporary and reversible change on cooling, wax solidifies, and no new product is formed while burning of a candle is a permanent change i.e. products are not convertible, a new substance is formed having different composition & different properties.
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संबंधित प्रश्न
Classify the following changes as physical or chemical:- melting of a solid (wax)
Is burning a physical change or a chemical change? Why?
True or false
Is melting of ice a reversible change?
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Give the main differences between physical changes and chemical changes.
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Differentiate between the following change with a suitable example.
Periodic and non-periodic change
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Sublimation involves a __________ change.
Give a reason why
Freezing of water is a reversible change while burning of a candle – an irreversible change.
Classify the following as physical or chemical properties
The composition of a sample of steel is 98% iron, 1.5% carbon and 0.5% other elements.
Classify the following as physical or chemical properties
Metallic sodium is soft enough to be cut with a knife.
