Alkanes and Alkenes

• C2H4 decolourises bromine water as it's an alkene.
• When a compound burns with a smoky flame, it's a sign of incomplete combustion
• Alkenes are made from alkanes by the process of cracking
• Ethene can be produced by the dehydration of ethanol
• The general formula for Alkenes is CnH2n
• The general formula for alkanes is CnH2n+2
• Saturated compounds are compounds that only contain single bonds between carbon atoms
• Longer alkanes are more viscous and have higher boiling points
• Shorter alkanes are more volatile and flammable
• Complete combustion is when all the hydrogen in the fuel is burned
• Complete combustion equation: hydrocarbon + oxygen = carbon dioxide + water
• Bromine water decolourises in a solution of alkenes.
• Individual units that make up polymers are called monomers .