Crude oil was formed from the fossilised remains of tiny sea plants and animals as they were compressed under layers of sediments. As a result, it is a of a very large number of . Most of the compounds in crude oil consist of hydrocarbons. A hydrocarbons is a molecules made up of and atoms only. Note: In an exam answer you must include the word 'only' in the definition to gain the mark. There are two key types of hydrocarbons: Alkanes Alkenes Much of crude oil are saturated hydrocarbons - alkanes. These are only have single bonds and so can not join with any more atoms.
Most of the compounds in crude oil consist of hydrocarbons. A hydrocarbons is a molecules made up of and atoms only. Note: In an exam answer you must include the word 'only' in the definition to gain the mark. There are two key types of hydrocarbons: Alkanes Alkenes Much of crude oil are saturated hydrocarbons - alkanes. These are only have single bonds and so can not join with any more atoms.
There are two key types of hydrocarbons:
Much of crude oil are saturated hydrocarbons - alkanes. These are only have single bonds and so can not join with any more atoms.
Alkanes have the general formula CnH2n+2 and you need to be able to reconise them in this way and also from their molecule diagrams.
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. An easy way to remeber this is if there are two 'e's in the ending then there is a double bond. Alkenes have the general formula CnH2n
