Pure and Mixed Substances: In the world of chemistry, substances are broadly classified into two fundamental categories: pure and mixed substances. Understanding these distinctions is crucial as they ...

The questions in this quiz are suitable for GCSE chemistry students studying pure substances and mixtures, paper chromatography and distillation. If you struggled with the quiz, don't panic - we've ...

Diamond only contains the element carbon. Air is a mixture of oxygen, carbon dioxide, nitrogen and other trace gases. Water only contains the compound water. Mineral water is a mixture of water and ...