SJI 2024 Y4 Prelim Chemistry Paper 1

1 ST. JOSEPH’S INSTITUTION PRELIMINARY EXAMINATION 2024 (YEAR 4) CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY Paper 1 Additional Materials: Multiple Choice Answer Sheet 6092/01 26 August 2024 1 hour (08:05 – 09:05) READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, index number and class on the Answer Sheet in the spaces provided. There are forty questions on this paper. Answer all questions. For each question, there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet. Read the instructions on the Answer Sheet very carefully. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this Question paper. A copy of the Periodic Table is printed on page 2 of this question paper. The use of an approved scientific calculator is expected, where appropriate. This document consists of 22 printed pages.

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3 1 The diagram shows the apparatus used to prepare a liquid compound L. Compound L (boiling point 57 °C) is made by heating together two liquids, M (boiling point 78 °C) and N (boiling point 95 °C). The reaction is slow. What is the purpose of the condenser? A to allow liquid L to escape as fast as it is formed B to enable M and N to mix more efficiently C to keep air away from the reacting liquids D to prevent M and N from escaping before the reaction is complete heat cold water M + N

4 2 A student plans two experiments. In experiment 1, he wants to determine the concentration of an aqueous solution of sodium hydroxide by reacting it with dilute hydrochloric acid. In experiment 2, he wants to investigate the rate of the reaction between calcium carbonate and dilute nitric acid by measuring the volume of gas produced at regular intervals. The student is provided with conical flasks for the experiments. What additional apparatus is needed? experiment 1 experiment 2 A burette, pipette balance, gas syringe B burette, pipette gas syringe, stopwatch C gas syringe, stopwatch burette, pipette D measuring cylinder, thermometer gas syringe, stopwatch 3 The apparatus below can be used to show the diffusion of gases. Which pair of gases in the porous pot will cause the water level at Z to rise after some time? A chlorine and krypton B ethene and methane C helium and nitrogen D hydrogen and propene carbon dioxide mixture of two gases Z porous pot

5 4 What is the number of electrons and neutrons in a hydroxide ion? ele