A-LevelChemistryStates of matterFeb/Mar 2017Paper 1 Q41 Mark

The boiling points of methane, ethane, propane and butane are given. compound CH4 boiling point/K 112 compound CH3CH3 boiling point/K 185 compound CH3CH2CH3 boiling point/K 231 compound CH3CH2CH2CH3 boiling point/K 273 Which statement explains the increase in boiling point from methane to butane?

Q: What topic does this question test?

This question tests States of matter in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

ACloser packing of molecules results in stronger van der Waals' forces.

BMore covalent bonds are present and therefore more energy is required to break the bonds.

CMore electrons in the molecules results in stronger van der Waals' forces.

DMore hydrogen atoms in the molecules results in stronger hydrogen bonding.

✓ Correct Answer

The correct answer is C: More electrons in the molecules results in stronger van der Waals' forces.

📋 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 States of matter in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry Feb/Mar 2017 examination, Paper 1 Variant 2.

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