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what factors affect melting point
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Several factors can affect melting point as follow

Composition of molecules


The melting point is higher for a substance in which the molecules are tightly packed compared to a substance in which the molecules are far apart from each other

Pressure:

The greater the pressure applied to a substance, the lower its melting point.
 

Impurities:

Solids containing impurities melt at low temperatures

Particle shape and size:

A substance has a higher melting point when the molecules are tightly bound together and when the spaces between them are small.

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