IB Chemistry HL 1.3.1 Combustion Reactions Questions

Apply complete-oxidation equations to alcohols, carbohydrates and triglycerides, then use stoichiometry to quantify products and energy release.

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Write a balanced complete-combustion equation for an alcohol, carbohydrate, triglyceride 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.

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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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Urea, $\left(\mathrm{H}_{2} \mathrm{~N}\right)_{2} \mathrm{CO}$ , is excreted by mammals and can be used as a fertilizer.

The combustion of urea produces water, carbon dioxide and nitrogen.

Formulate a balanced equation for the reaction.

$2\left(\mathrm{H}_{2} \mathrm{~N}\right)_{2} \mathrm{CO}(\mathrm{~s})+3 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow 4 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})+2 \mathrm{CO}_{2}(\mathrm{~g})+2 \mathrm{~N}_{2}(\mathrm{~g})$

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IB Chemistry HL 1.3.1 Combustion Reactions Questions question 1