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A brief description of the difference between thermal and catalytic cracking of alkanes. This is done by passing decane over a powdered aluminium oxide catalyst at 500°C. I) Balance the equation: Decane ethene + octane C10H22 C2H4 +. [1] ii) Suggest why the decane MUST be heated before cracking can occur. Equation For The Cracking Of Alkane Decane Structural Formula. A- level Chemistry/OCR/Chains, Energy and Resources/Basic Concepts and Hydrocarbons/Alkanes. The AlkanesAlkanes are saturated hydrocarbons. This means that they contain only carbon and hydrogen atoms and they contain no carbon- carbon double bonds. Cracking of hydrocarbons involves thermal decomposition. This means that large hydrocarbon molecules break into smaller molecules when they are heated. The hydrocarbons are boiled and the hydrocarbon gases are either mixed with steam and heated to a very high temperature. Decane cracking equation formula.