A-LevelChemistryEquilibriaMay/June 2017Paper 1 Q101 Mark
A reaction involved in the Contact process is shown. 2SO₂(g) + O₂(g) ⇌ 2SO₃(g) ΔH° = –197 kJ mol⁻¹ The reaction is investigated at 200 kPa and 700 K and the value of the equilibrium constant, Kp, is found to be Y. The reaction is then investigated at 1000 kPa and 700 K and the value of Kp is found to be Z. Which statement comparing Y and Z is correct?
AY and Z are the same.
BY is greater than Z.
CZ is 2.2 times greater than Y.
DZ is 5.0 times greater than Y.
✓ Correct Answer
The correct answer is A: Y and Z are the same.
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
🔒
Unlock the Examiner's Analysis
Sign up for free to reveal the full examiner report, trap analysis, and mark scheme breakdown for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep