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IB Chemistry HL 1.3.2 Incomplete Combustion Questions

Apply product, energy and air-to-fuel reasoning to compare complete and incomplete combustion and explain CO oxidation.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

Exam points

  • Identify carbon monoxide or carbon as products that distinguish incomplete from complete combustion.
  • Compare the energy released by complete and incomplete combustion of the same fuel using the products formed and consistent molar basis.
  • Explain how increasing the air-to-fuel ratio promotes oxidation of CO to CO₂ and reduces CO emissions.

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Study 1.3.2—Incomplete combustion conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Chemistry HL 1.3.2 Incomplete Combustion Questions question 1

[Maximum number: 1]

Ethanol is obtained by the hydration of ethene, C2H4\mathrm{C}_{2} \mathrm{H}_{4}.

Suggest two possible products of the incomplete combustion of ethene that would not be formed by complete combustion.

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