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Using the van der wann forces to our favor we can separate the different molecules in many different chemicals, like gasoline and petroil.

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Petrolium is an homogenus mixture of many different molecules of hydrocarbon.

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Used in the raffinery of the petrochemicals
Fossil fuel is a generic term for non-renewable energy resources such as coal, coal products, natural gas, derived gas, crude oil, petroleum products and non-renewable wastes.

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This test is made for understand if a compound is alkane or alkene.
We will use bromine water to see if they react with it and, if so, determine thet the substance is unsaturated.
As you can see in the immage above alkane(on the right) didn't react nor change color, and on the left the alkene reacted becoming colourless.

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Unaturated hydrocarbon. Molecules of these compound contain a C=C dubble bonds somewhere in their chain.
Their generic formula is Cn H2n.

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Saturated hydrocarbon.Molecules of these compound contain only single bonds between the carbon atom.
Their generic formula is Cn H2n+2.

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Molecules composed only by hybridized carbon and hydrogen

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the study of the structure, properties, composition and preparation of carbon-containing compounds.