Writing & Balancing Equations, OCR A-Level Chemistry, M2

This comprehensive OCR A Level Chemistry PowerPoint lesson teaches students how to write and balance chemical equations using step-by-step explanations, worked examples and practice activities.

Designed for OCR Chemistry A (H032/H432), Module 2: Foundations in Chemistry, this resource supports specification point 2.1.2(b) – Compounds, Formulae and Equations. It is ideal for Year 12 students developing the fundamental skills needed to construct accurate chemical equations and represent chemical reactions.

The lesson introduces chemical equations as symbolic representations of reactions, explaining the roles of reactants and products. Students learn to translate word equations into chemical formulae, recognise common diatomic elements and understand why equations must be balanced according to the conservation of atoms.

The PowerPoint develops students’ understanding of coefficients and subscripts, emphasising why chemical formulae must remain unchanged when balancing equations. Clear worked examples demonstrate how to count atoms, including those within brackets and polyatomic ions, before introducing a structured, step-by-step method for balancing chemical equations.

Students progressively apply these skills to increasingly challenging reactions, including metal oxidation, reactions with water, combustion and acid–alkali reactions. Guided examples, independent practice questions and opportunities to check answers help reinforce understanding and develop confidence.

Throughout the lesson, students engage with a starter activity, key terminology, worked examples, structured exercises and knowledge checks. Answers are provided to support assessment for learning and immediate feedback.

Supplied as an editable PowerPoint presentation (.pptx), this resource is suitable for classroom teaching, independent practice, revision and consolidation of essential equation-writing skills.

Last updated: November 2026.