Essential Chemistry for IGCSE - Particles And Purification (Section 5 - No. 29)
Which of the following statement(s) is/are true about a pure substance?
It is made up of only one type of atom or molecule.
It has a sharp melting point.
It has a boiling range.
It contains impurities.
Explanation
A pure substance is only one type and has a sharp melting point. Impurities would alter these characteristics.
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