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प्रश्न
What happens to water if it is heated and Explain the phenomenon of change of state of water.
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उत्तर
Water on heating changes into steam at 100°C
\[\ce{water->[heating]steam(100°C)}\]
Phenomenon of change of state of water:
Water is a liquid under ordinary conditions but, when it is kept in a deep freezer, it changes into ice at 0°C and when ice is kept at room temperature again changes back into liquid water.
Similarly, water on heating change into steam at 100°C, which on cooling changes back into liquid water. But there is no change in the chemical composition of water. When its state changes from liquid to solid or liquid to gaseous state.
\[\ce{\underset{\text{(solid)}}{Ice}⇌[Heat][Cool]\underset{\text{(liquid)}}{Water}⇌[Heat][Cool]\underset{\text{(gas)}}{steam}}\]
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संबंधित प्रश्न
What are the characteristics of particles of matter?
Give reasons:
Solids cannot be compressed.
Water cycle is an example of inter conversion of states of water. Explain.
Give two examples of the following:
Substances which are rigid and not compressible.
The state of matter which has no definite shape or volume is called
- solid
- liquid
- gas
- water
Differentiate the general properties of solids, liquids and gases in the form of a table — with reference to shape.
State the term which refers to the conversion of a substance on heating from.
- solid-state to liquid state
- liquid state to vapour state
- vapour state to liquid state
- liquid state to solid-state.
‘Inter-particle attraction between atoms of gases is very weak’. State five properties of gases which correlate as a consequence of the weak inter-particle attraction between particles of gases.
In which of the three states of matter – solids, liquids, or gases is the movement of atoms about their own position. Give a reason for the same.
Match the following.
| Property | Example |
| Breaks easily (Brittle) | Metal pan |
| Bends readily | Rubber band |
| Can be stretched easily | Cotton wool |
| Gets compressed easily | Mud pot |
| Gets heated readily | Plastic wire |
