CAIE IGCSE Chemistry 11.5.2 Manufacture of Alkenes and Hydrogen By Questions

Work through real CAIE IGCSE Chemistry questions to explain catalytic cracking and balance equations for alkene, shorter-alkane and hydrogen products.

Exam points

state that cracking uses high temperature and a catalyst on long-chain alkane vapour
identify shorter alkanes, alkenes and sometimes hydrogen as cracking products
balance a cracking equation by conserving carbon and hydrogen atoms across all products
recognise cracking as the industrial route from long-chain hydrocarbons to alkene feedstock

[Maximum number: 1]

Many organic compounds contain carbon and hydrogen only.

Propene, $\mathrm{C}_{3} \mathrm{H}_{6}$ , can be produced by heating $\mathrm{C}_{11} \mathrm{H}_{24}$ . The products of the reaction are propene, hydrogen and one other product in a 1: 1: 1 mole ratio.

Complete the symbol equation for this reaction.

\mathrm{C}_{11} \mathrm{H}_{24} \rightarrow \mathrm{C}_{3} \mathrm{H}_{6}+\mathrm{H}_{2}+

$\mathrm{C}_{8} \mathrm{H}_{16}$

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CAIE IGCSE Chemistry 11.5.2 Manufacture of Alkenes and Hydrogen By Questions question 1