Copy of SCSS Prelim 2024 Chem P3 QP

SWISS COTTAGE SECONDARY SCHOOL SECONDARY FOUR PRELIMINARY EXAMINATION O Name Academic Class 4 A Form Class Register Number Form Class 4 S CHEMISTRY Paper 3 Practical Additional Materials: As listed in the Confidential Instructions 6092/03 Monday 9 September 2024 1 hour 50 minutes READ THESE INSTRUCTIONS FIRST Write your class, register number and name on all the work you hand in. Give details of the practical shift and laboratory where appropriate, in the boxes provided. 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. Answer all questions in the spaces provided on the Question Paper. 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 page 12. At the end of the examination, fasten all your work in both parts separately. The number of marks is given in brackets [ ] at the end of each question or part question. Shift Laboratory For Examiner’s Use Question 1 Question 2 Question 3 Total This document consists of 11 printed pages and 1 blank page. [Turn over Home of Thoughtful Leaders: Serve with Honour, Lead with Humility

2 1 The reaction of magnesium and dilute hydrochloric acid is exothermic. You are going to investigate the temperature change when magnesium is added to dilute hydrochloric acid of different concentrations. Read all the instructions below carefully before starting the experiments in Question 1. Instructions You are going to carry out five experiments. P is 1.000 mol/dm3 hydrochloric acid. You are provided with five vials of magnesium. Each vial contains two pieces of magnesium ribbons each measuring 1 cm in length. (a) Experiment 1 Using a 10 cm3 measuring cylinder, pour 10 cm3 of P into a boiling tube. Measure the initial temperature of P in the boiling tube and record the value in the table. Transfer the magnesium ribbons from one of the vials to P in the boiling tube. Stir the mixture gently with the thermometer. Measure the highest temperature reached and record it in the table. Wash the thermometer and boiling tube with water. Experiments 2 to 5 Repeat Experiment 1, using different volumes of P and water given in the table. For example, in Experiment 2 measure 8 cm3 of P into the measuring cylinder and then add water to P until the total volume in the measuring cylinder is 10 cm3. Complete the table by calculating the change in temperature for each experiment. experiment volume of P / cm3 volume of water / cm3 initial temperature / C highest temperature / C change in temperature / C 1 10 0 2 8 2 3 6 4 4 4 6 5 2 8 [4]

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