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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
Fill in the blank.
A new substance is formed in a ............... change.
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True or false
In a physical change no net energy change is involved.
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Classify the following as a physical or a chemical change.
Burning of coal
Distinguish between the following.
Physical change and chemical change
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Select the chemical changes from the following list of changes
Boiling of milk.
Select the chemical changes from the following list of changes
Drying of a fruit
