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Chem Past Paper Essay Preview: Chem Past Paper Report this essay Exam Choice2007 Chemistry Trial HSC examination. Marking guidelines and sample answers.Section I Part A Multiple Choice123456789101112131415DACABDDDCCACCDDSection I Part BQuestion 16 (a) H9Draws the structure of polystyrene showing 3 repeating units.2Draws the structure of polystyrene with one minor error.1sample answer: (should except any correct, commonly used abbreviation.