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प्रश्न
Given reason:
Freezing of water to ice and evaporation of water are physical changes.
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उत्तर
Freezing of water to ice and evaporation of water are physical change because water can be brought back to its original (liquid) form by
- We can heat the ice to bring it back to water.
- We can cool down the vapours to bring it back to water.
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संबंधित प्रश्न
Changes in which only ______ properties of a substance change are called physical changes.
Ripening of fruits is a desirable change.
True or false
Is melting of ice a reversible change?
True or false
Change of seasons is a non-periodic change.
Separate the following into physical and chemical changes :
Sublimation of a solid, Decomposition of water into hydrogen and oxygen by passing electric current, Formation of clouds, Making a fruit salad from raw fruits, Dissolving carbon dioxide in water
Give the main differences between physical changes and chemical changes.
Fill in the blank.
The reaction in which energy is evolved is called
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.
Select the correct answer from the choice given below to complete the sentence
The dissolution of lead nitrate in water is deemed as a _________ change.
Give two examples for the following case:
Physical changes which are not reversible
