A-LevelChemistryReaction kineticsFeb/Mar 2021Paper 1 Q111 Mark
The Boltzmann distribution curve for a gaseous mixture of ethene and hydrogen is shown. Nickel is an effective catalyst for the reaction that occurs. [Figure showing Boltzmann distribution curve with Ea (catalysed) and Ea labeled] How does the diagram appear if the same reaction mixture is at a higher temperature?
AThe curve is unchanged.
BThe values of both Ea (catalysed) and Ea decrease.
CThe values of both Ea (catalysed) and Ea increase.
DThe values of both Ea (catalysed) and Ea remain the same.
✓ Correct Answer
The correct answer is D. This question tests the candidate's understanding of reaction kinetics 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