A-LevelChemistryReaction kineticsOct/Nov 2019Paper 1 Q11 Mark
The diagram shows a Boltzmann distribution of the energies of gaseous molecules and the activation energies, Ea, of a reaction with and without a catalyst. [Figure 1.1]
AIf the temperature of the gas is increased, the maximum of the curve becomes higher.
BIf the temperature of the gas is increased, the maximum of the curve moves to the left.
CThe fraction of molecules that react in the presence of a catalyst is shown by [symbol of vertically striped rectangle]
DThe fraction of molecules that react in the absence of a catalyst is shown by [symbol of diagonally striped rectangle]
✓ 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...
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