Addition reactions open the double bond
Addition reactions open the double bond
An addition reaction joins two molecules to form one product, with nothing else formed. In an alkene, the carbon-carbon double bond opens so that each carbon can make one new bond.
Step-by-step lessons on Edexcel GCSE Chemistry 10.2.3 Addition reactions of alkenes and testing for unsaturation. 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.