1. Alkenes

2. 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.

4. Alkenes Burning
Alkenes burn in oxygen to give carbon dioxide and water vapour.
C2H O CO H2O

5. Alkenes - Boiling Point

6. 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.

7. Chemical Test for Unsaturation – Double Bond
If the alkene is mixed with a solution of bromine. The bromine loses it colour.
Ethene + bromine ,2-dibromoethane
Addition Reaction

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