Chemical reactions of the alkenes

2 marks · Hard

State the products formed when pentene (C5H10) undergoes complete combustion in oxygen. Write a balanced chemical equation for the reaction.

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Also accept: carbon dioxide and water; balanced equation using molecular or displayed formulae

Common mistakes: Incorrect products (e.g., carbon monoxide); Incorrect balancing

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Marking points

B1 · 1 mark · States that the products are carbon dioxide and water.

B2 · 1 mark · Gives the balanced chemical equation: C5H10 + 7.5O2 → 5CO2 + 5H2O or C5H10 + 15/2 O2 → 5CO2 + 5H2O, or doubled coefficients.

Worked solution

Combustion of pentene produces carbon dioxide and water as the products.