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Question

Hello, I have a doubt in chemistry.I want to ask that how a sublime substance like ammonium chloride, camphor directly convert into vapour from solid. 


Solution

Sublimation is a process in which a substance directly changes from its solid state into its gaseous state.
In other words, it is the direct conversion of a solid into a gas.Ammonium chloride, camphor and naphthalene are some examples of sublimable substances.

All substances are made up of atoms and molecules. These particles are held together by a force of attraction. If the force of attraction is weak the particles can be separated easily.The camphor molecules are held together by weak force and simply evaporate on heating without melting.
(A piece of camphor gives off a strong smell. It means that even at a moderate temperature the molecules of camphor escape and spread everywhere.)

Sublime particles have weak force of intermolecular attraction, so that their molecules are easily seperated and converted to gaseous phase.
 

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