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प्रश्न
Select the chemical changes from the following list of changes
Vaporisation of water into water vapour.
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
Write true or false for the statement
Decomposition of leaves is a fast change.
Fill in the blank
Chemical change occurs as a result of __________ between two substances.
State whether the following is physical or chemical changes.
water cycle in nature —
State whether the following is physical or chemical changes.
mixing oil with water —
Classify the following as a physical or a chemical change.
Boiling of water
Differentiate between a physical change and a chemical change with reference to – Formation of products.
Give reasons why – separation of mixtures e.g. iron from a mixture of iron and sulphur is a physical change, but heating a mixture of iron and sulphur is considered a chemical change.
State which of the following terms connected with change of state of matter i.e.
(a) Melting
(b) Vaporisation
(c) Condensation
(d) Freezing
pertain to –
- Conversion of a liquid into a vapour or gas.
- Conversion of a liquid into a solid.
- Conversion of a solid into a liquid on heating.
Stretching gold coin into a ring is a ______ change.
Give two examples for each of the following cases:
Physical changes are reversible.
