2022 RI H2Chem Prelims P4 Questions

© Raffles Institution 2022 9729/04/A/22 [Turn Over CANDIDATE NAME ( ) CLASS 22S0 RAFFLES INSTITUTION 2022 YEAR 6 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY Paper 4 Practical 9729/04 24 August 2022 2 hours 30 minutes Do NOT turn over the Question Booklet until you are told to do so. READ THESE INSTRUCTIONS FIRST. Write your name and class on the space provided when instructed to do so. Give details of the practical shift and laboratory where appropriate, in the space provided. Write in dark blue or black pen. You may use a HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Answer all questions in the spaces provided on the Question Paper. The number of marks is given in brackets [ ] at the end of each question or part question. The use of an approved scientific calculator is expected, where appropriate. You may lose marks if you do not show your working or if you do not use appropriate units. Qualitative Analysis Notes are printed on pages 22 and 23. Shift Laboratory Bench Number For Examiner’s Use Question Marks 1 / 14 2 / 14 3 / 16 4 / 11 Total / 55 This document consists of 22 printed pages and 2 blank pages.

2 © Raffles Institution 2022 9729/04/A/22 Answer all the questions in the spaces provided. 1 Investigation of the effect of temperature on the rate of a reaction D-glucose, C6H12O6, is a sugar that can act as a reducing agent. In this question, you will investigate the effect of temperature on the rate of the redox reaction between acidified potassium manganate(VII) and D-glucose. FA 1 is 0.010 mol dm−3 potassium manganate(VII), KMnO4. FA 2 is 1.0 mol dm−3 sulfuric acid, H2SO4. FA 3 is 0.20 mol dm−3 D-glucose, C6H12O6. Initially, the reaction mixture is intensely purple. As the reaction proceeds, the intensity of the purple colour will decrease until the reaction mixture becomes colourless when the reaction is completed. The rate of the reaction is studied by measuring the time taken for the purple colour to disappear. You will perform a series of four experiments. Graphical analysis of your results will enable you to determine how temperature affects the rate of the reaction. For each experiment, you will measure and record the • time taken, t, in seconds for the reaction mixture to turn colourless, • initial temperature, Tinitial, and fin