What topic does this question test?

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

Which exam paper is this question from?

This question appeared in the Cambridge A-Level Chemistry Oct/Nov 2013 examination, Paper 1 Variant 2 (9701_w13_qp_12.pdf).

A-LevelChemistryReaction kineticsOct/Nov 2013Paper 1 Q61 Mark

The diagrams below show the Boltzmann distribution for air at two temperatures. The solid line represents the distribution at –20 °C. The dotted line represents the distribution at –10 °C. Which diagram is correct?

AGraph with solid line (–20°C) peaking higher and to the left, and dotted line (–10°C) peaking lower and to the right, with the dotted line having a shorter tail on the right.

BGraph with solid line (–20°C) peaking higher and to the left, and dotted line (–10°C) peaking lower and to the right, with the dotted line having a longer tail on the right.

CGraph with solid line (–20°C) peaking lower and to the right, and dotted line (–10°C) peaking higher and to the left.

DGraph with solid line (–20°C) peaking higher and to the left, and dotted line (–10°C) peaking lower and to the right, with the dotted line having a longer tail on the right and similar area under both curves.

✓ Correct Answer

The correct answer is D: Graph with solid line (–20°C) peaking higher and to the left, and dotted line (–10°C) peaking lower and to the right, with the dotted line having a longer tail on the right and similar area under both curves.

📋 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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The diagrams below show the Boltzmann distribution for air at two temperatures. The solid line represents the distribution at –20 °C. The dotted line represents the distribution at –10 °C. Which diagram is correct?

✓ Correct Answer

📋 Examiner Report & Trap Analysis

🎯 Mark Scheme Breakdown

Unlock the Examiner's Analysis

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