Essential Chemistry for IGCSE - Particles And Purification (Section 2 - No. 23)
What are the characteristic of a pure substance?
It is made of only one type of atom or molecule.
It has a constant, sharp melting and boiling point.
It can be easily separated into its components.
It is a mixture of elements.
Explanation
A pure substance only contains one type of substance, and will have sharp, constant melting and boiling points.
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