A-LevelChemistryEquilibria9701/12 · May/June 2011 · Q41 Mark

The esterification reaction ethanol + ethanoic acid ⇌ ethyl ethanoate + water is an equilibrium. The forward reaction is exothermic. How can the value of the equilibrium constant Kĉ be increased?

Aby adding a little concentrated sulfuric acid as a catalyst

Bby increasing the initial concentration of ethanol

Cby lowering the temperature

Dby raising the temperature

✓ Correct answer

C: by lowering the temperature

Oracle Prep sorts past-paper questions by topic, so you can drill Equilibria and see which topics are most likely to come up next.

Topic: Equilibria, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2011 Paper 1 Variant 2, question 4.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content

Ammonia is manufactured from nitrogen and hydrogen using the Haber process. N₂(g) + 3H₂(g) ⇌ 2NH₃(g) What is the expr…

Sulfur dioxide and oxygen react in the gas phase. 2SO₂(g) + O₂(g) ⇌ 2SO₃(g) ∆H = –197 kJ mol⁻¹ Which statements are c…

The reaction between sulfur dioxide and oxygen is reversible. 2SO₂ + O₂ ⇌ 2SO₃ ΔH° = –196 kJ mol⁻¹ Which conditions o…

Compound X contains a single ester group. X contains 27.6% by mass of oxygen. Which pair of products could be produce…

What is the least number of carbon atoms in a non-cyclic alkane molecule that has a chiral centre?

Compound Y is heated with a mild oxidising agent. One of the products of the reaction reacts with hydrogen cyanide fo…