A-LevelChemistryChemical energeticsMay/June 2021Paper 1 Q71 Mark
The reaction pathway diagram for the catalysed reaction and the uncatalysed reaction between N₂ and H₂ is shown. N₂(g) + 3H₂(g) ⇌ 2NH₃(g) [Reaction pathway diagram] Which letter represents the activation energy for the first step in the decomposition of NH₃ in the presence of a catalyst?
AA
BB
CC
DD
✓ Correct Answer
The correct answer is D. This question tests the candidate's understanding of chemical energetics within the Chemistrysyllabus. The examiner's mark scheme requires...
📋 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...
🔒
Unlock the Examiner's Answer
Sign up for free to reveal the correct answer, the official mark scheme breakdown, and the examiner trap analysis for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep