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Alkenes can act as monomers. Under high pressure and in the presence of a catalyst many monomer molecules join together to make polymer molecules. These polymer molecules are saturated.
Alkanes
Most of the compounds in crude oil are hydrocarbons. This means they only contain hydrogen and carbon atoms, joined together by covalent bonds. Remember that a covalent bond is a shared pair of electrons. Alkanes are a type of hydrocarbon.
The number of hydrogen atoms in an alkane is double the number of carbon atoms, plus two. For example, the molecular formula of methane is CH4. For ethane, it is C2H6.
Alkane molecules can be represented by displayed formulas in which each atom is shown as its symbol (C or H), and the covalent bonds between them by a straight line. The table shows four alkanes.
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