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प्रश्न
Give a reason why
Freezing of water is a reversible change while burning of a candle – an irreversible change.
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उत्तर
Freezing of water is reversible change as on heating frozen ice changes to water by heating.
Burning of a candle is irreversible change as on reversing the conditions we can not get candle back out of CO2, water vapours and wax vapours.
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संबंधित प्रश्न
Changes in which only ______ properties of a substance change are called physical changes.
Fill in the blank.
Heat is .................... by a gas during the process of condensation.
Melting of solid (wax) is a physical change.
Make a list of different types of changes with example.
State whether the following is physical or chemical changes.
mixing oil with water —
State the Differences Between a Physical Change and a Chemical Change.
Classify the following as a physical or a chemical change.
Boiling of water
Ice, water and water vapour look different and display different ______ properties but they are ______ the same.
Grinding of wheat grain changes its size. It is a ____________ change.
Give an example to justify the statement that physical changes can be reversible as well as irreversible.
