Heat up the long-chained hydrocarbon so that they turn into a gas (vaporise).There are 2 different types of cracking catalytic cracking and steam cracking. Some of the smaller hydrocarbons are used as fuels and others are used to make polymers.Ĭracking is a thermal decomposition reaction, which is the breaking down of molecules using heat (thermal decomposition is an endothermic reaction as energy/ heat is taken in). Cracking is a process that breaks down less useful longer chained hydrocarbons, like bitumen, into shorter more useful hydrocarbons, which are less viscous and easier to ignite. Shorter chained hydrocarbons are more useful than longer chained ones because longer chained hydrocarbons are very viscous (do not flow well – like golden syrup) and are harder to ignite (set fire to).
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