Energy and covalent bonds
Energy and covalent bonds
During a chemical reaction, atoms are rearranged. Bonds in the reactants break, and new bonds form in the products.
Step-by-step lessons on AQA GCSE Chemistry 5.1.3 The energy change of reactions (HT only). 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.