Question

With the help of labelled diagram, describe in brief an activity to show sublimation of
camphor.

Answer 1

The process of converting solid form of a substance directly into vapour form is called sublimation.

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Activity:

Take some camphor or ammonium chloride.

Crush the compound taken and put it in a china dish

Put an inverted funnel over the china dish      

Put a cotton plug on the stem of the funnel

Heat the china dish slowly and observe.

 

Ammonium chloride on heating changes directly into gaseous state.

NH4Cl ( Solid )----> NH4Cl ( in vapour state )

Observations: 

A change of state directly from solid to gas without changing into liquid state  is observed, this phenomenon is called sublimation.