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प्रश्न
State three characteristics of molecules of matter.
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उत्तर
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Molecules are very small:
- Molecules are tiny particles that cannot be seen with the naked eye. They make up all matter, such as solids, liquids, and gases.
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Molecules are always moving:
- In solids, molecules vibrate in fixed positions.
- In liquids, they move more freely.
- In gases, they move very fast and spread in all directions.
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Molecules are held together by forces:
- Molecules are held together by attractive forces called intermolecular forces. These forces are strongest in solids, weaker in liquids, and weakest in gases.
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संबंधित प्रश्न
Fill in the blank
The gases are .......... dense.
How do the solids, liquids, and gases differ in their following properties.
(a) Size
(b) Shape
(c) Density
Describe the molecular model for a liquid. I-low does it explain that a liquid has no definite shape, but has a definite Volume?
What do you mean by the change of state of matter?
Water cycle is an example of interconversion of states of water. Explain.
For the following statement, say whether it describes a solid, a liquid, or a gas.
Particles are far apart and move in all directions.
Give two examples for of the following
Substances which are rigid and not compressible.
Fill in the blanks:
Water is a matter because it has ______ and occupies ______.
Match the characteristics of the three states of matter in List I with their correct answer from List II.
| List I | List II |
| 1. Are highly rigid and have a definite shape | A: Solids and gases only |
| 2. Have no definite shape | B: Solids only |
| 3. Have definite volume but no definite shape | C: Liquids and gases only |
| 4. Are highly compressible and least rigid | D: Gases only |
| 5. Have no definite volume | E: Solid, liquids and gases |
| 6. Have no definite shape and volume |
F: liquids only |
| 7. Occupy space | G: Solids and liquids only |
| 8. Are not compressible | |
| 9. Are slightly compressible | |
| 10. Have mass |
Match the arrangement of atoms in the three states of matter in List I with the correct state in List II.
| List I | List II |
| 1. Arrangement of atoms is far apart | A: Solids |
| 2. Force of attraction between atoms is very strong | B: Liquids |
| 3. Movement of atoms is in any random direction | C: Gases |
| 4. Particles diffuse very easily | |
| 5. Particles show movement about their own position |
