2024 XMS P3 PRELIM MS

This document consists of 10 printed pages. XINMIN SECONDARY SCHOOL SEKOLAH MENENGAH XINMIN Preliminary Examination 2024 CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY Secondary 4 Express Setter: Mr Lim Boon Ping Vetters: Mrs Annie Ng / Ms Tiffany Lim 6092/03 14 Aug 2024 1 hour 50 minutes Candidates answer on the Question Paper. Additional Materials: As listed in the Confidential Instructions READ THESE INSTRUCTIONS FIRST Write your name, class and index number on the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue, correction fluid or highlighters. 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. Answer all questions in the spaces provided on the Question Paper. Qualitative Analysis Notes are printed on page 9. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use 1 16 2 18 3 6 Total 40 Parent’s Signature Shift Laboratory

2 XMSS/Chemistry/6092/03/Preliminary Examination 2024 Answer all questions. Write your answers in the spaces provided. 1 You are going to investigate the temperature changes when two solids, C and D, dissolve in water. Read all the instructions carefully before starting the experiments in Question 1. Instructions You are going to do two experiments. (a) Experiment 1 1. Put the polystyrene cup into the 250 cm3 beaker for support. 2. Use the measuring cylinder to pour 40 cm3 of deionised water into the polystyrene cup. 3. Measure the initial temperature of the deionised water and record it in the first row of the table. 4. Add the 5 g sample of solid C to the polystyrene cup and stir the solution with the thermometer. 5. Measure and record the temperature of the solution after 1 minute. 6. Calculate and record the temperature change, including whether the temperature increased (+) or decreased (–). 7. Pour the solution away and rinse out the polystyrene cup with deionised water. 8. Repeat the procedure using the 7 g and 8 g samples of solid C. Record your results and the temperature change, including whether the temperature increased (+) or decreased (–), in the appropriate row of the table. mass of solid C / g initial temperature of the water / C temperature of the solution after 1 min / C temperature change / C 5 7 8 [2]

3 XMSS/Chemistry/6092/03/Preliminary Examination 2024 (b) Experiment 2 Repeat Experiment 1 but using the 3 g, 4 g, 6 g and 8 g samples of solid D. Record your results in a table. In your table, c alculate and record the temperature changes in each case, incl