Oil is made up of Hydrocarbons. These are molecules are only made up from __________ and __________. There are a limited combination of arrangements because Hydrogen will make __________ covalent bond and Carbon will make __________ covalent bonds.
Alkenes are like Alkanes in that they are __________ chains. The difference is, Alkenes contain a double covalent bond between two of the carbons.
With this double bond comes a name change. The -ane ending becomes an -ene ending. For example: ethane becomes ethene.
Hydrocarbons containing only single bonds are said to be 'saturated hydrocarbons' while hydrocarbons containing double covalent bonds are said to be 'unsaturated hydrocarbons'. This is because we can break double covalentbonds and add more atoms to the molecule in an __________ reaction.
We can detect double bonds by adding bromine. the bromine 'adds across' the double bond. The orange coloured bromine molecules are used up and their colour disappears.