Cracking
This process involves big molecules of hydrocarbon(alkane) are broken up into smaller molecules in the presence of a catalyst at a high temperature.
An example of cracking is when big petroleum molecules are broken up into smaller hydrocarbon molecules to produce fuel for motor vehicles, most of the fuel used in vehicles is produced by cracking.
Another example is a big alkane molecule breaks down into an alkane molecule and an alkene molecule.
This is a exothermic reaction because energy is needed to break the molecule.
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