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===About the Alkene Test===
: The '''alkene test''' identifies [[Unsaturated Hydrocarbon|unsaturated hydrocarbons]].
: The '''alkene test''' is done by adding them to [[Bromine Water]]. If the [[Bromine Water]] turns from orange to colourless, then an [[Unsaturated Hydrocarbon|unsaturated hydrocarbon]], such as an [[alkene]] is present. During this test the [[Bromine]] [[Chemical Reaction|react]]s with the [[alkene]] to form a [[DibromoalkaneBromoalkane]].
: [[Ethene]] + [[Bromine]] → [[Dibromoethane]]
: <chem>C2H4 + Br2 -> C2H4Br2</chem>