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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
Classify the following as chemical or physical change:
Passing of electric current through water, and water breaking down into hydrogen and oxygen gases.
Write true or false for the statement.
Burning of paper and formation of curd are reversible changes
Classify the following changes as physical or chemical:- photosynthesis in plants
State whether the following is physical or chemical changes.
lightning —
Tick the most appropriate answer.
Physical changes are
Sublimation is classified as a physical change. Why ?
Photosynthesis is a natural process by which green plants manufacture food in the presence of sunlight.
State the conclusions which can be drawn, to represent photosynthesis as a physical or a chemical change.
Fill in the blank with the appropriate word of the statement given below:
If a change is permanent and irreversible it is considered a _________ change.
Fill in the blank with the correct word of the statement given below:
Sublimation of iodine is an example of _________ change.
Give a reason why – Heating a platinum wire is a reversible change but, heating a magnesium wire is an irreversible change.
