A-LevelChemistryReaction kineticsFeb/Mar 2019Paper 1 Q11 Mark

The Boltzmann distribution is shown for a sample of gas at an initial temperature, T1. [Figure 1.1] The sample of gas was heated to temperature, T2. What is the correct distribution for the higher temperature, T2?

Q: What topic does this question test?

This question tests Reaction kinetics in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

ABoltzmann distribution curve for T2 showing a higher peak shifted to the left compared to T1.

BBoltzmann distribution curve for T2 showing a lower peak shifted to the right compared to T1.

CBoltzmann distribution curve for T2 showing a very high peak shifted to the left compared to T1.

DBoltzmann distribution curve for T2 showing a higher peak shifted to the right compared to T1.

✓ Correct Answer

The correct answer is B: Boltzmann distribution curve for T2 showing a lower peak shifted to the right compared to T1.

📋 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...

🎯 Mark Scheme Breakdown

Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.

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About This A-Level Chemistry Question

Topic

This multiple-choice question tests Reaction kinetics in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry Feb/Mar 2019 examination, Paper 1 Variant 2.

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