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What is crude oil? Crude oil is a naturally-occurring substance found trapped in certain rocks below the earth's crust. It is a dark, sticky liquid which, scientifically speaking, is classed as a hydrocarbon. This means, it is a compound containing only hydrogen and carbon. Crude oil is highly flammable and can be burned to create energy. Along with its sister hydrocarbon, natural gas, crude oil makes an excellent fuel. Hydrocarbons Hydrocarbons are organic molecules that contain only carbon (C) and hydrogen (H). Examples of hydrocarbons: * Methane * Propane * Benzene * Etc...... Unsaturated & Saturated Hydrocarbons 1. Saturated Hydrocarbons Saturated hydrocarbons contain only single carbon-carbon bonds, and therefore contain the greatest possible number of hydrogen atoms for their number of carbon atoms. E.g. * Alkanes * Branched Alkanes 2. Unsaturated Hydrocarbons Unsaturated hydrocarbons contain double and triple carbon-carbon bonds, and therefore do not contain the greatest possible number of hydrogen atoms for...

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