What structural feature identifies an alkene?
The alkene with three carbon atoms is propene.
The number of hydrogen atoms is twice the number of carbon atoms.
A carbon-carbon double bond, written C=C\text{C}=\text{C}C=C, identifies an alkene.
The double bond uses one extra bond between the carbon atoms, leaving room for two fewer carbon-hydrogen bonds.
Flashcards for AQA GCSE Chemistry 7.2.1 Structure and formulae of alkenes, covering the key terms, definitions and equations you need to recall for Paper 1 and Paper 2. 24 cards, matched to the AQA GCSE Chemistry (8462) specification. Recall questions account for roughly 40% of marks at GCSE Chemistry, so these target the marks you can secure before the paper starts.
