This comprehensive OCR A Level Chemistry PowerPoint lesson covers ions and ionic formulae, helping students confidently predict ionic charges and write accurate chemical formulae.

Designed for OCR Chemistry A (H432/H032), Module 2: Foundations in Chemistry, this resource addresses specification point 2.1.2(a) – Compounds, Formulae and Equations. It is ideal for introducing ionic formulae to Year 12 students and developing the essential skills required for AS and A Level Chemistry.

The lesson begins by introducing ions, cations and anions, explaining how atoms form charged particles through the loss or gain of electrons. Students learn to predict ionic charges using the periodic table, recognise transition metal ions with variable charges, and recall the names and formulae of important ions specified by OCR, including nitrate, carbonate, sulfate, hydroxide and ammonium.

The PowerPoint then guides students through writing ionic formulae by balancing positive and negative charges. Clear worked examples demonstrate the use of subscripts, the criss-cross method, simplifying ionic ratios and correctly applying brackets when working with polyatomic ions. Common errors are highlighted to help students avoid mistakes.

Throughout the lesson, students complete structured activities, practise applying their knowledge and check their understanding using provided answers. The resource includes a starter activity, key terminology, detailed explanations, worked examples and opportunities for independent practice.

Supplied as a PowerPoint presentation (.pptx), this resource is suitable for classroom teaching, revision and consolidation of fundamental chemical formula-writing skills.

Last updated: November 2026.