A-LevelChemistryReaction kineticsOct/Nov 2016Paper 1 Q11 Mark
The molecules of a gas at a constant temperature, T₁, have the distribution of molecular energies shown in the diagram. [Figure showing molecular energy distribution with T1 peak] When the temperature is increased to T₂, the distribution of molecular energies changes. Which diagram correctly shows this change?
AGraph where T₂ peak is lower and shifted to the right of T₁ peak, with T₂ curve having a longer high-energy tail. Both curves start at the origin.
BGraph where T₂ peak is higher and shifted to the left of T₁ peak. Both curves start at the origin.
CGraph where T₂ peak is lower and shifted to the right of T₁ peak, but T₁ curve does not start at the origin.
DGraph where T₂ peak is lower and shifted to the right of T₁ peak, but T₂ curve does not start at the origin.
✓ Correct Answer
The correct answer is A. 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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