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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
Classify the following into solids, liquids and gases.
Oxygen, milk, common salt, wax, stone, water vapour, carbon-dioxide, sugar, mercury, coal, blood, butter, copper, coconut oil, kerosene.
The process by which a solid change into a liquid is called
Write whether the following statement is true or false.
There is no difference between evaporation and boiling.
The intermolecular force is _______ in the particles of solid.
Water, mercury and bromine are similar to each other, because three are ______.
Give two examples.
Gaseous element
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, very closely packed | A: Solids |
| 2. Interparticle space is maximum | B: Liquids |
| 3. Force of attraction between particles is very weak | C: Gases |
| 4. Movement of particles is about their own position | |
| 5. Particles in the state of matter are slightly compressible and not closely packed. |
Give a reason for the following:
A crystal of iodine on slow heating in a closed flask turns into vapours and fills the complete flask.
Give a reason for the following:
An empty tumbler lowered into a glass beaker containing water, on tilting shows bubbles of air coming out, but when not tilted, no bubbles are seen.
Write scientific reason.
Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.
