A-LevelChemistryChemical bondingFeb/Mar 2016Paper 1 Q81 Mark
Solid carbon dioxide, CO₂, is similar to solid iodine, I₂, in its structure and properties. Carbon is in Group 14. Silica, SiO₂, is a Group 14 compound. Which statement about solid CO₂ and solid SiO₂ is correct?
ABoth solids exist in a lattice structure.
BBoth solids have a simple molecular structure.
CBoth solids have atoms joined by single covalent bonds.
DBoth solids change spontaneously to gas at s.t.p.
✓ Correct Answer
The correct answer is A: Both solids exist in a lattice structure.
📋 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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