Topic C2.1: Purity and separating mixtures (OCR Gateway A GCSE Combined Science)

This bundle of 10 lessons covers all of the content in the sub-topic C2.1 (Purity and separating mixtures) of the OCR Gateway A GCSE Combined Science specification. The topics covered within these lessons include:

• Explain what is meant by the purity of a substance and use melting point to distinguish pure from impure
• Calculate the relative formula mass separately and in a balanced symbol equation
• Deduce the empirical formula of a compound
• Explain that many useful materials are formulations of mixtures
• Describe and explain the processes of filtration, crystallisation, simple distillation and fractional distillation
• Describe the processes of paper and thin-layer chromatography
• Recall that chromatography involves a mobile and stationary phase
• Interpret chromatograms

All of these lesson presentations and accompanying resources are detailed and engaging and contain regular progress checks to allow the students to constantly assess their understanding.