SJI 2022 Y4 Prelim Chemistry 6092 P1 QP

1 ST JOSEPH’S INSTITUTION PRELIMINARY EXAMINATION 2022 (YEAR 4) CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY Paper 1 Additional Materials: Multiple Choice Answer Sheet 6092/01 31 August 2022 1 hour (08:00 – 09:00) 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 18 printed pages including this cover page.

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3 1 Two gases, ammonia and hydrogen chloride, are allowed to enter the apparatus as shown below. After some time, a white solid is formed on the inside of the tube. Which statements explain why a white solid is formed in the position shown? 1 Ammonia and hydrogen chloride react to form solid ammonium chloride. 2 Ammonia diffuses faster than hydrogen chloride. 3 Ammonia has a higher relative molecular mass than hydrogen chloride. A 1 only B 1 and 2 only C 2 and 3 only D 1, 2 and 3 2 The gas jar contain s compound W which is present in the solid, liquid and gaseous states. Which of the following statements is correct? A A gaseous W molecule has a lower mass than a liquid W molecule. B Liquid W molecules move slower than solid W molecules. C When W changes from gas to liquid, energy is absorbed. D When W changes from liquid to solid, energy is released. HCl(g) NH3(g) white solid stopper gas W liquid W solid W

4 3 A student plans two experiments. Experiment 1 : To find the concentration of aqueous sodium hydroxide by titration with dilute hydrochloric acid Experiment 2: To find the rate of the reaction between calcium carbonate and dilute hydrochloric acid by measuring the volume of gas given off every minute What are the other apparatus needed in addition to a conical flask? experiment 1 experiment 2 A burette, pipette electronic balance, measuring cylinder, thermometer B burette, pipette measuring cylinder, gas syringe, stopwatch C electronic balance, measuring cylinder, thermometer measuring cylinder, gas syringe, stopwat