O-LevelChemistryRates of Reaction5070/21 · Oct/Nov 2023 · Q87 Marks
Ethanoic acid is manufactured from methanol. CH₃OH(g) + CO(g) ⇌ CH₃COOH(g) The forward reaction is exothermic.
- (a)(i)Predict and explain the effect, if any, on the position of equilibrium when the pressure is decreased and the temperature remains constant.[2]
- (a)(ii)Predict and explain the effect, if any, on the position of equilibrium when the temperature is decreased and the pressure remains constant.[1]
- (b)Ethanoic acid can be produced by bacterial oxidation. Describe one other method of making ethanoic acid by oxidising an alcohol other than methanol. name of alcohol name of oxidising agent[2]
- (c)Ethanoic acid reacts with propan-1-ol, CH₃CH₂CH₂OH, to produce an ester. Name the ester and draw its displayed formula. name displayed formula[2]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2023). The mark or mark type is shown in brackets.
- [1] (a)(i) position of equilibrium moves to the left
- [1] (a)(i) more moles of gas on the left of the equation / fewer moles of gas on the right of the equation
- [1] (a)(ii) position of equilibrium moves to the right
- [1] (a)(ii) AND because the forward reaction is exothermic
- [1] (b) ethanol
- [1] (b) (aqueous acidified) potassium manganate(VII)
- [1] (c) propyl ethanoate
- [1] (c) (drawing of CH₃COOCH₂CH₂CH₃ with all bonds shown)
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