Pure substances and purity tests
Pure substances and purity tests
In chemistry, a pure substance is one element or one compound only. If another substance is mixed in, even in a small amount, the sample is impure.
Step-by-step lessons on CIE IGCSE Chemistry Separation and purification. Each one builds up to exam-style questions. Build a solid grasp of atomic structure, bonding and the mole concept early, since these underpin almost every other topic, then move on to the more calculation-heavy quantitative and organic chemistry content.