Recall the formulae of molecules of the alkanes, methane, ethane, propane and butane, and draw the structures of these molecules, showing all covalent bonds

Explain why the alkanes are saturated hydrocarbons

Recall the formulae of molecules of the alkenes, ethene, propene, butene, and draw the structures of these molecules, showing all covalent bonds (but-1-ene and but-2-ene only)

Explain why the alkenes are unsaturated hydrocarbons, describing that their molecules contain the functional group C=C

Recall the addition reaction of ethene with bromine, showing the structures of reactants and products, and extend this to other alkenes

Explain how bromine water is used to distinguish between alkanes and alkenes

Describe how the complete combustion of alkanes and alkenes involves the oxidation of the hydrocarbons to produce carbon dioxide and water