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प्रश्न
Why can a piece of chalk be broken easily into smaller pieces while a coal piece cannot be broken easily?
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उत्तर
The particles of matter have force acting between them. This force keeps the particles together. The strength of this force of attraction is lesser in chalk, hence it could be broken easily into smaller pieces.
But the strength of inter-molecular force of attraction is very strong in coal, therefore it is not possible to break them into small pieces.
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संबंधित प्रश्न
Match the columns.
| (1) iron and gold | (a) molecules are very far apart |
| (2) melting | (b) pure substance |
| (3) intermolecular space | (c) non - metals |
| (4) compound | (d) the space between the molecules |
| (5) gases | (e) change from solid to liquid |
| (f) metals |
A solid is a state of matter that has
- no definite shape.
- large intermolecuiar space.
- high intermolecuiar force of attraction.
- no definite volume.
Define the following term Intermolecular force .
Give reason
A red ink drop added to small amount of water in a glass turns water red in some time.
State two characteristics of matter demonstrated by diffusion.
When a beam of sunlight enters a room through a window, we can see tiny particles X suspended in a gas (or rather a mixture of gases) Y which are moving rapidly in a very haphazard manner.
- What could particles X be ?
- Name the gas (or mixture of gases) Y.
- What is the phenomenon exhibited by particles X known as ?
- What is causing the movement of particles X ?
- What conclusion does the existence of this phenomenon give us about the nature of matter ?
Define the Solid and give two examples.
Differentiate the general properties of solids, liquids and gases in the form of a table — with reference to space.
Which one of the following element name is not derived from planet?
Mention any two characteristics of the particles of matter.
