A-LevelChemistryReaction kineticsMay/June 2024Paper 1 Q151 Mark
Gas Q decomposes slowly at room temperature. Q(g) → X(g) + Z(g) The Boltzmann distribution curve for gas Q at room temperature is shown. [Figure 15.1] Which change occurs when a catalyst is added to gas Q?
AThe peak of the curve moves to the right on the diagram.
BThe number of particles with enough energy to decompose increases.
CThe kinetic energy of the unreacted particles increases.
DThe value of Ea decreases, moving the vertical dotted line to the right on the diagram.
✓ Correct Answer
The correct answer is B. 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...
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