View source for Identifying Pure Substances

==Key Stage 3==
===Meaning===
'''Identifying Pure Substances''' is a set of [[method]]s that can be used to determine if a [[substance]] is a [[mixture]] of other [[substances]] or whether it is pure.

===About Identifying Pure Substances===
: To identify if a [[substance]] is pure the experimenter should try several [[Separating Mixtures|separation]] techniques.
To find if a [[liquid]] is pure:
: 1. Filter the substance. If a residue is left in the filter paper, then the substance is not pure.
: 2. Distill the substance. If a material is left behind during distillation then it is not pure.
To find if a [[solid]] is pure:
: 1. Dissolve the solid in a solvent.
: 2. Place a drop of the solution on chromatograph paper and use the same solvent to complete a chromatography experiment. If two or more separate patches appear, then it is not pure.