OCR A Level Chemistry A (H432) Chemistry B (H433) PAG 6: Synthesis of an organic solid Practice Exam Questions and Mark Scheme

This resource includes exam questions from both Chemistry A and Chemistry B. It is not designed as a topic test but is instead intended as a document to support the teaching and learning of Module 1 – Development of practical skills in chemistry. 1. A solid organic compound can be purified by recrystallisation. Which statement(s) about recrystallisation is/are true? 1 The organic compound is more soluble in hot solvent. 2 The hot solution is cooled before the purified organic compound is collected. 3 The melting point of the purified organic compound is lower than the impure compound. A 1, 2 and 3 B Only 1 and 2 C Only 2 and 3 D Only 1 Your answer [1] 2. When are insoluble impurities removed during recrystallisation? A when the hot solution is filtered B as the solution cools C when the crystals are filtered off D when the crystals are washed Your answer