IB Chemistry SL 1.3.1 Combustion Reactions Questions

Use real exam questions to balance complete-combustion equations, calculate mole ratios and compare the energy released by fuels.

Exam points

Write a balanced complete-combustion equation for a reactive metal, non-metal, hydrocarbon, alcohol or other organic compound, including correct formulas, coefficients and states where required.
Use combustion stoichiometry to relate fuel amount to oxygen consumed and carbon dioxide or water formed, including integer-coefficient and mole-ratio calculations.
Identify the useful energy output of complete oxidation and compare combustion equations or fuels on a consistent molar or mass basis.

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Study 1.3.1—Combustion reactions conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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Ethyne, $\mathrm{C}_{2} \mathrm{H}_{2}$ , reacts with oxygen in welding torches.

Write an equation for the complete combustion of ethyne.

$\mathrm{C}_{2} \mathrm{H}_{2}(\mathrm{~g})+2.5 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{CO}_{2}(\mathrm{~g})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l})$

OR
$2 \mathrm{C}_{2} \mathrm{H}_{2}(\mathrm{~g})+5 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow 4 \mathrm{CO}_{2}(\mathrm{~g})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})$

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IB Chemistry SL 1.3.1 Combustion Reactions Questions question 1