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प्रश्न
Select the chemical changes from the following list of changes
Vaporisation of water into water vapour.
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उत्तर
Change of water into water vapours is a PHYSICAL change as no change in composition, only state changes, is reversible change on cooling vapour water is formed.
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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.
Tick the most appropriate answer.
4. Chemical changes involve
- change in shape.
- change in size.
- change in molecular composition.
- none of these
State whether the following is physical or chemical changes.
water cycle in nature —
True or false
Change of seasons is a non-periodic change.
What is a chemical change ? Give two examples of chemical changes.
Classify the following as a physical or a chemical change.
Boiling of water
Fill in the blank.
The reaction in which energy is evolved is called
______ is the Universal Solvent.
Water is the universal solvent. Why?
Give two examples for the following case:
Physical changes which are not reversible
