Chemistry


Chapter : 1. Matter In Our Surrounding

Solid to liquid change : Melting

Defination : The process in which a solid substance changes into a liquid on heating, is called melting (or fusion).
Melting point : The temperature at which a solid substance melts and changes into a liquid at atmospheric pressure, is called melting point of the substance.
Ice is a solid. In solids, the particles are tightly packed together. When we heat a solid, its particles become more energetic and kinetic energy of the particles increases. Due to the increase in kinetic energy, the particles start vibrating more strongly with greater speed. The energy supplied by heat overcomes the intermolecular forces of attraction between the particles. As a result, the particles leave their mean position and break away from each other. When this happens, the solid melts and a liquid is formed.
Example.
Melting point of ice = 0ºC
Melting point of wax = 63ºC
Melting point of iron = 1535ºC
The melting point of a solid is a measure of the force of attraction between its particles. Higher the melting point of a solid substance, greater will be the force of attraction between its particles.

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