IB Chemistry SL Reactivity 1.3.1 Combustion Reactions

Practise writing and balancing complete combustion equations for reactive elements, hydrocarbons and alcohols. Form carbon dioxide and water for an organic fuel, use the smallest…

Exam points

write carbon dioxide and water as products of complete organic-fuel combustion
balance carbon and hydrogen before oxygen and report the requested coefficient form
use the balanced ratio to calculate oxygen required or energy released per fuel amount

[Maximum number: 1]

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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1.3.1—Combustion reactions question 1