A-LevelChemistryChemical bondingMay/June 2018Paper 1 Q91 Mark
Materials can be classified by their chemical structures. Four common types of structure are metallic, ionic, simple molecular and giant molecular. Some physical properties of four substances are shown in the table. Which substance has a simple molecular structure? [Table with melting point, effect of adding water, and electrical conductivity]
A64
reacts
good when solid
B113
insoluble
always poor
C767
soluble
good when solid
D1600
insoluble
always poor
✓ Correct Answer
The correct answer is B: 113 insoluble always poor
📋 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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