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    What is the chemical reaction by which carbohydrates change into hydrocarbons?

    It is believed that crude oil - hydrocarbon mix - is from wood or plant materials - carbohydrates.  How this happens?

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    Chemical energy is the potential of a chemical substance to undergo a transformation through a chemical reaction or, to transform other chemical substances. Breaking or making of chemical bonds involves energy, which may be either absorbed or evolved from a chemical system. Energy that can be released (or absorbed) because of a reaction between a set of chemical substances is equal to the difference between the energy content of the products and the reactants.


    Petroleum (L. petroleum, from Greek: petra (rock) + Latin: oleum (oil)[1][2]) or crude oil is a naturally occurring flammable liquid consisting of a complex mixture of hydrocarbons of various molecular weights and other liquid organic compounds, that are found in geologic formations beneath the Earth's surface. A fossil fuel, it is formed when large quantities of dead organisms, usually zooplankton and algae, are buried underneath sedimentary rock and undergo intense heat and pressure.


    <caption>Composition by weight</caption>

    Element Percent range

    Carbon
    83 to 87%


    Hydrogen
    10 to 14%


    Nitrogen
    0.1 to 2%


    Oxygen
    0.05 to 1.5%


    Sulfur
    0.05 to 6.0%


    Metals
    < 0.1%




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