Ocr A Level Chemistry A (H432) Chemistry B (H433) 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. Ethanol is oxidised to ethanoic acid using acidified potassium dichromate(IV) solution. The reactionis heated under reflux using the equipment shown in the diagram below.What is the reason for heating under reflux?A. to ensure even heatingB. to prevent any substances escapingC. to boil the mixture at a higher temperatureD. to allow efficient mixingYour answer [1]2. A chemist compares the rates of hydrolysis of 1-chloropropane and 1-bromopropane in ethanol.Which reagent in aqueous solution should be used?A Silver chlorideB Silver nitrateC Potassium chlorideD Potassium nitrateYour answer [1] Created in ExamBuilder 1 OCR 2020 OCR A Level Chemistry A (H432) Chemistry B (H433) PAG 5: Synthesis of an organic liquidPractice Exam Questions and Mark Scheme3. A student wants to remove an acid impurity from an organic liquid. What should the student do?A. Add Na2 CO3 (aq)B. Reflux the mixtureC. Add Br2D. Add MgSO4Your answer [1] 4. For which purpose is distillation used?A to allow a liquid to boil without the loss