Alkenes.

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Presentation transcript:

Alkenes

Alkenes Unsaturated hydrocarbons Alkenes contain a C==C double bond somewhere in the chain. Alkenes have the general formula CnH2n Where n is the number of carbon atoms The simplest alkene must contain 2 carbon atoms.

Alkenes Burning Alkenes burn in oxygen to give carbon dioxide and water vapour. C2H4 + 3O2 2CO2 + 2H2O

Alkenes - Boiling Point

The double bond The double bond in alkenes makes then much more reactive than alkanes. Other atoms can all to the molecule when the double bond breaks open. The double bond is the functional group for alkenes.

Chemical Test for Unsaturation – Double Bond If the alkene is mixed with a solution of bromine. The bromine loses it colour. http://www.youtube.com/watch?v=2C_6ax2TsV8 Ethene + bromine 1,2-dibromoethane Addition Reaction

Activity Complete the questions on page 292 Make the following alkenes; Ethene Butene Pentene Hexene Propene