Alkenes

• Carbon atoms can form double bonds in addition to single bonds
• Not all carbon atoms in alkenes have to be linked to four other atoms
• Alkenes have at least one double bond, making them unsaturated
• General formula for alkenes: CnH2n
• Ethene is the simplest alkene, composed of four hydrogen atoms and two carbon atoms with a double carbon-carbon (C=C) bond
• Other alkenes include propene, butene, and pentene
• Alkenes are more reactive than alkanes due to their double bond
• Alkenes react with oxygen in combustion reactions
• Alkenes tend to burn with smokier flames than alkanes due to incomplete combustion
• Alkenes can be used to make a range of new compounds, including polymers and industrial alcohol