Ethanol burns in air
3 marks · EasyEthanol, C2H5OH, burns in air.
Write the balanced chemical equation for the complete combustion of ethanol.
State the name of the homologous series to which ethanol belongs.
Name the functional group present in ethanol.
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(a) \ce{C2H5OH + 3O2 -> 2CO2 + 3H2O}
(b) alcohols
(c) hydroxyl
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Marking points
M1 (a) · 1 mark · Balanced chemical equation: \ce{C2H5OH + 3O2 -> 2CO2 + 3H2O} (Allow state symbols optional, allow correct multiples)
B1 (b) · 1 mark · Homologous series: alcohols
B2 (c) · 1 mark · Functional group: hydroxyl (accept OH or –OH)
Worked solution
a) Balanced equation:
b) Ethanol belongs to the alcohols homologous series.
c) The functional group in ethanol is the hydroxyl group, written as –OH.