A very good observation lesson! A complete lesson for the topic chemical analysis (AQA C10 or C12) for KS4 Pure and Impure Substances. Multiple acitvities such as; item sorting (pure and impure to tackle misconceptions of purity), matching definitions (compulsory for learning), graph animations to explain cooling curves of pure and impure chemicals, Video link (explaining a cooling curve), formulation activity and much more! Complete with learning objectives, starter activity and plenary! A very engaging lesson that can be adapted for any level classroom. Key words: Chemical analysis, pure, impure, formuation, melting point, boiling point, cooling curve, video, activities, definitions, sorting acitivity, adaptable, fun and engaging.