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प्रश्न
Give a reason for the following:
Globules of mercury kept in a petri dish, which is shaken slowly, come together forming a big globule.
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उत्तर
This experiment concludes that there is a force of attraction between matter particles.
Mercury in particular has a powerful cohesive force between its molecules.
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संबंधित प्रश्न
Why do solids, liquids and gases differ in their physical states?
Differentiate between the following.
Atoms and Molecules .
For the following statements, say whether it describes a solid, a liquid or a gas.
Particles move about very quickly.
For the following statements, say whether it describes a solid, a liquid or a gas.
Particles are far apart and move in all directions
Define matter.
Give reason :
The odour of scent spreads in a room.
Write a scientific reason.
Hydrogen is combustible, oxygen helps combustion, but water helps to extinguish fire.
State the correct term from A, B, C, D, E or F in List II which represents the – change of state of matter or its relevant property from List I
| List I | List II |
| 1. Solid 'X' to a liquid 'Y' | A: Liquefaction |
| 2. Liquid 'Y' to its vapour 'Z' | B: Vaporization |
| 3. 'Z' to 'Y' | C: Melting |
| 4. 'Y' to 'X' | D: Solidification |
| 5. The temperature at which 'Y' changes to 'Z' | E: Melting Point |
| F: Boiling point |
Fill in the blank:
Matter made up of one kind of particle is said to be _________.
Write scientific reasons.
Lemon sherbat has a sweet, sour and salty taste and it can be poured in a glass.
