Cracking converts longer hydrocarbons into shorter molecules. GCSE examples often show a shorter alkane and an alkene. Real processes produce mixtures; one balanced equation is an example rather than the only possible outcome.
Count carbon and hydrogen separately. When the alkane product is supplied, subtract its atoms from the original molecule to determine the other product. Never change the supplied molecular formulas to force the result.
Industrial cracking uses energy. Vaporised hydrocarbons may pass over a hot catalyst; steam cracking uses high temperature with steam. These are process descriptions, not instructions for a home experiment.
Shorter fuels and alkenes can be more useful in the required product mix. Alkenes are feedstocks for other chemicals and polymers. The economic justification depends on demand and process data.
Worked example
C10H22 → C8H18 + C2H4 conserves ten carbons and twenty-two hydrogens.
The C2H4 product has the alkene formula in this stated open-chain comparison.
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Explain why a balanced cracking equation need not describe the entire industrial product mixture.
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Use conservation of atoms.
Distinguish an example outcome from a unique prediction.
Recognise multiple products and process conditions.
Example answer
The example conserves all atoms but other atom-balanced splits are possible. Industrial cracking produces a mixture influenced by the feedstock and conditions. A single equation illustrates one outcome, not the complete product distribution.
An answer to improve
A balanced equation proves these are the only two products.
Improve your answer
State the named substances, coefficients and conditions. Replace a general rule with the evidence that actually supports your conclusion.
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