Other important addition reactions of alkenes
5 marks · HardEthene is an important starting material in the chemical industry.
Write the balanced chemical equation for the hydrogenation of ethene.
Write the balanced chemical equation for the hydration of ethene.
State one use for the product of the hydration reaction.
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(a)
(b)
(c) As a fuel or in alcoholic drinks or as a solvent (any correct use).
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Marking points
M1 (a) · 1 mark · Correct formulae for reactants and product for hydrogenation.
A1 (a) · 1 mark · Equation correctly balanced for hydrogenation.
M2 (b) · 1 mark · Correct formulae for reactants and product for hydration.
A2 (b) · 1 mark · Equation correctly balanced for hydration.
B1 (c) · 1 mark · Any valid use for ethanol stated (e.g., fuel, drinks, solvent).
Worked solution
a) Hydrogenation: ethene reacts with hydrogen to give ethane.
b) Hydration: ethene reacts with water (steam) to give ethanol.
c) Ethanol can be used as a fuel, a solvent, or in alcoholic drinks.