Limiting and excess reactants
Limiting and excess reactants
The limiting reactant is the reactant that is completely used up first. Once it runs out, the reaction stops, so it controls the maximum amount of product formed.
Step-by-step lessons on Edexcel GCSE Chemistry 2.6.6 Limiting reactants and stoichiometry. Each one builds up to exam-style questions. Nail the core quantitative topics — moles, balancing equations and calculations — early on, since they underpin higher-tier questions across every paper and topic.