Useful Substances From Crude Oil 3.0 / 5 based on 1 rating ? ChemistryCrude oil, cracking and hydrocarbonsGCSEAQA Created by: corndog!!!Created on: 09-06-13 14:04 What do you call the process where long hydrocarbon chains are broken down to form shorter ones? Cracking 1 of 6 What is the problem with long hydrocarbon chains? They are not efficient because they do not flow easily and are difficult to ignite. 2 of 6 Explain what happens in CRACKING The fractions contains the long hydrocarbon chains are heated to vaporise them. 3 of 6 Name the different processes in cracking after vapourisation Passing over a catalyst/Mixed with steam and heated to very high temperatures 4 of 6 What does cracking do? Breaks the chemical bonds in the molecules, causing a thermal decomposition reaction. 5 of 6 What is the general formula for alkenes? CnH2n 6 of 6
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