A-LevelChemistryPolymerisationMay/June 2017Paper 1 Q381 Mark
The diagram shows the monomer used to make polyvinyl chloride, PVC. [Figure 38.1] Assuming that one particular molecule of the polymer forms from n molecules of the monomer (where n is many thousands), which statements are correct? 1 The relative molecular mass of this polymer molecule is approximately 62.5n. 2 There are n chiral carbon atoms in this polymer molecule. 3 There are 5n σ bonds in one polymer molecule.
A1, 2 and 3 are correct
B1 and 2 only are correct
C2 and 3 only are correct
D1 only is correct
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The correct answer is B. This question tests the candidate's understanding of polymerisation within the Chemistrysyllabus. The examiner's mark scheme requires...
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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...
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