RI 2024 Prelims P4 QP

© Raffles Institution 2024 9729/04/A/24 [Turn Over CANDIDATE NAME ( ) CLASS 24S0 RAFFLES INSTITUTION 2024 YEAR 6 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY Paper 4 Practical 9729/04 21 August 2024 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 23 and 24. Shift Laboratory Bench Number For Examiner’s Use Question Marks 1 / 15 2 / 13 3 / 14 4 / 13 Total / 55 This document consists of 21 printed pages and 3 blank pages.

2 © Raffles Institution 2024 9729/04/A/24 [Turn Over Answer all the questions in the spaces provided. 1 Determination of the molar enthalpy change of solution, ∆Hsol, of FA 1 FA 1 is solid anhydrous magnesium sulfate, MgSO4. When added to water, FA 1 dissolves and the temperature of the solution rises. Some of the heat energy released from the dissolution of FA 1 is absorbed by the calorimeter. To determine the molar enthalpy change of solution, ∆Hsol, of FA 1, you will first need to determine the heat capacity of the calorimeter. The heat capacity of the calorimeter, Ccal, is the amount of heat energy required to change its temperature by 1 °C. The calorimeter used in this experiment comprises two polystyrene cups supported by a 250 cm3 glass beaker. (a) (i) Determination of the heat capacity of the calorimeter, Ccal When hot water is added to the calorimeter containing room temperature water, heat energy from the hot water is used to raise the temperature of the calorimeter and the room temperature water. To determine the heat capacity of the calorimeter, C cal, you will measure the maximum temperature rise when hot water is added to