Temasek 2024_Prelim_Sec 4E Chemistry P1

St. Gabriel’s Secondary School 2024 ‘O’ Preliminary Examination Subject : Chemistry Paper : 6092 / 01 Level/Stream : Secondary 4 (Express) Duration : 1 hour Date : 26 August 2024 Additional Materials: Multiple Choice Answer Sheet 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 unless this has been done for you. 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 booklet. A copy of the Periodic Table is printed on page 18. The use of an approved scientific calculator is expected, where appropriate. 2023_EYE_Sec 3N Science (Chemistry) This question paper consists of 18 printed pages. Name: …………………………………………………… ( ) Class: Sec ………………..

2 SGSS/Chemistry/P1/4E/Prelim/2024 1 The setup shown is used to collect gas produced during a chemical reaction. Which reaction is this setup best suited for? A CaCO3(s) → CaO(s) + CO2(g) B C6H5N2Cl(s) + H2O(l) → C6H5OH(aq) + N2(g) + HCl(aq) C CuSO4.5H2O(s) → CuSO4(s) + H2O(g) D Na2SO3(s) + 2HCl (aq) → 2NaCl(aq) + SO2(g) + H2O(l) 2 The table shows the Rf values for dyes P, Q, R and S in four different solvents. dye solvent ethanol propanone tetrachloromethane water P 0.91 0.72 0.58 0.34 Q 0.82 0.65 0.20 0.00 R 0.75 0.65 0.13 0.59 S 0.66 0.42 0.20 0.00 Which statement is correct? A Dye P is the most soluble in all four solvents. B Dyes Q and R are the same dye as they have the same Rf value in propanone. C Dye S is the only dye that is insoluble in water. D Ethanol is the only solvent that can be used to separate a mixture of all four dyes. 3 Weather balloons are used in the study of the climate and atmosphere. A weather balloon filled with helium gas greatly increases in volume as it goes higher up in the sky. What is a likely reason for the expansion of the balloon as it goes higher? A The distance between particles in the balloon decreases. B The distance between particles in the balloon increases. C The energy of the particles in the balloon decreases. D The energy of the particles in the balloon increases.

3 SGSS/Chemistry/P1/4E/Prelim/2024 4 Tube 1 shows the result of an experiment to investigate the formation of ammonium chloride from the reaction between ammonia gas and hydrogen chloride gas. A similar experiment was set up in Tube 2 to investigate the reaction between ammonia gas and hydrogen fluoride gas. A