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infoWhy this? Dynamic equilibrium explains why reversible reactions reach a stable composition without stopping. Le Chatelier's principle and concentration-based equilibrium constants allow us to predict responses to changing conditions and quantify equilibrium composition.

scheduleWhy now? Kinetics provides the distinction between equal reaction rates and equal concentrations, while amount of substance supports equilibrium calculations. This foundation is needed before extending equilibrium to gas-phase systems and acid–base behaviour in Year 13.