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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:
Making a fruit salad with raw fruits
Solve this crossword by using the clues that follow.
Across
1. Energy in the form of sunlight is absorbed by the green plants in this process.
4. The reddish-brown substance formed over iron in the presence of oxygen and moisture.
5. This change is permanent and irreversible.
6. The process in which a solid directly changes into gaseous state.
Down
1. It is the change that takes place in case of swinging pendulum of a clock.
2. Occurrence of this is a non-periodic change as well as a natural change.
3. It is a physical change
True or false
In a physical change no net energy change is involved.
Classify the following as physical or chemical change :
Formation of curd from milk
Given reason:
Cutting of a cloth piece is a physical change, though it cannot be reversed.
Differentiate between a physical change and a chemical change with reference to – Nature of change is temporary and reversible or permanent and irreversible.
Name the following:
The term involved in the change of state from – ‘water to ice’ – which is a physical change.
Distinguish physical and chemical changes.
What is the difference between dissolution of sugar and burning of sugar ?
Give two examples for the following case:
Physical changes which are not reversible
