Hydrocarbons are organic molecules that consist of only carbon and hydrogen atoms

Hydrocarbons are organic molecules that consist of only carbon and hydrogen atoms

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          Hydrocarbons  are organic molecules that consist of only carbon and hydrogen atoms.           Hydrocarbons are the major component of petroleum, a fossil fuel that consists of the partially decomposed  remains of organisms that lived millions of years ago.           Fats are biological molecules that have long hydrocarbon tails attached to a nonhydrocarbon component.           Petroleum and fat are hydrophobic compounds that cannot dissolve in water because of their many  nonpolar carbon-to-hydrogen bonds.           Isomers  are compounds that have the same molecular formula but different structures and, therefore,   different chemical properties.           For example, butane and isobutane have the same molecular formula, C 4 H 10 , but butane has a straight  skeleton and isobutane has a branched skeleton.
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