Question

1. How can a solid be changed into liquid state?
Explain on the basis of molecular theory.​

Answer 1

Changes in state :

• Matter is anything that has mass and occupies space.
• Matter has three forms : Solid, liquid and gas.
• The force between the molecules is called intermolecular force.
• The space between the molecules is called intermolecular space.
• The force between the atoms is called chemical bond.
• In solid, the molecules are tightly packed.
• In liquids, the molecules are loosely packed.
• In gases, the molecules are very loosely packed.

Question : How can a solid be changed into liquid state ?

Answer : A solid can be changed into liquid state by heating. The process is called melting of a solid.

In a solid , the molecules are very loosely packed. They vibrate in their places. When heated, they gain an energy from outside and starts vibrating to a higher extent. The molecules starts to loosen and forms a liquid.

Example - Ice ------> Water

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