Collision theory
Collision theory
A reaction can happen only when reacting particles collide. Most collisions are unsuccessful because the particles bounce apart without reacting.
Step-by-step lessons on Edexcel GCSE Chemistry 8.1.2 Collision theory and the factors affecting rate. 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.