Alkenes are unsaturated hydrocarbons
Alkenes are unsaturated hydrocarbons
Alkenes are hydrocarbons containing a carbon-carbon double bond, written C=C\text{C}=\text{C}C=C. A carbon-carbon double bond consists of two covalent bonds joining the same two carbon atoms. For example, propene has the structural formula CH3CH=CH2\text{CH}_3\text{CH}=\text{CH}_2CH3CH=CH2, while propane has the structural formula CH3CH2CH3\text{CH}_3\text{CH}_2\text{CH}_3CH3CH2CH3.
Step-by-step lessons covering AQA GCSE Chemistry 7.2.1 Structure and formulae of alkenes for Foundation and Higher tier. Each lesson works through exam-style questions in Paper 1 and Paper 2 format. Nail the core quantitative topics — moles, balancing equations and calculations — early on, since they underpin higher-tier questions across every paper and topic.