Energy moves between chemicals and surroundings
Energy moves between chemicals and surroundings
The surroundings are everything outside the reacting chemicals, including the solvent, container and air. An exothermic reaction transfers energy to the surroundings, causing their temperature to rise.
Step-by-step lessons on OCR GCSE Chemistry 3.2 Energetics, covering 3.2.1 Exothermic and endothermic reactions and reaction profiles and 3.2.2 Calculating energy change from bond energies. 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.