SJI 2021 Y4 Prelim Chemistry 6092 P1

ST JOSEPH’S INSTITUTION PRELIMINARY EXAMINATION 2021 (YEAR 4) CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY Paper 1 Additional Materials : Multiple Choice Answer Sheet 6092/01 30 August 2021 1 hour (09:45 – 10:45) READ THESE INSTRUCTIONS FIRST Write your name, index number and class on the Answer Sheet in the spaces provided. Do not use staples, paper clips, glue or correction fluid. There are forty questions on this paper. Answer all questions. For each question, there are four possible answers A, B, C or D. Choose the one you consider correct and record your choice in soft pencil on the 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 1 100 cm3 of carbon dioxide, CO2, diffused through a porous pot in 40 seconds. What would be the time taken for the same volume of ethene gas, C2H4, to diffuse? A 25 seconds B 35 seconds C 40 seconds D 55 seconds 2 The melting points and the boiling points of four substances are listed in the table below. substance melting point / °C boiling point / °C argon -189 -186 bromine -7 59 chlorine -101 -35 sulfur dioxide -75 -10 Which substance exists as a liquid at -90 °C? A argon B bromine C chlorine D sulfur dioxide 3 The solubility curves of three sa lts are shown below. Which salts can be prepared by crystallisation? A W only B Y only C W and X only D X and Y only solubility per 100g of water Salt W Salt X Salt Y temperature / °C

4 4 The diagram below shows the chromatogram of four substances, W, X, Y and Z. Which of the following statements is correct? A W contains X and Y. B X is more soluble than Z. C Y contains three components. D Z has a larger Rf value than X. 5 A particle of an isotope of sulfur contains 18 neutrons and 18 electrons. What is the symbol for this particle? A 𝑆16 34 2+ B 𝑆16 34 2- C 𝑆16 36 D 𝑆18 36

5 6 The diagram below shows the valence electrons of element W when combined with element X. Which of the following statements is incorrect, given that W is found in period 3 of the Periodic Table? A The oxide of W dissolves in water to form a solution which has pH ˃7. B W can react with lithium to form an ionic compound. C W cannot conduct electricity in any state. D W is a solid at room temperature.