Copy of KCPSS_2024_4E_Chem_Prelim_P1

[Turn Over KUO CHUAN PRESBYTERIAN SECONDARY SCHOOL 2024 PRELIMINARY EXAMINATION Secondary 4 Express NAME CLASS REG. NO CHEMISTRY 6092 / 01 Paper 1 Multiple Choice 28 August 2024 1 hour Additional Materials: Multiple Choice Answer Sheet. Setter: Ms Koh Li Eng READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and register number 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 22. The use of an approved scientific calculator is expected, where appropriate. This document consists of 22 printed pages.

2 KCPSS 2024/Sec 4Exp Prelim Chem P1 [Turn Over 1 Diagrams 1, 2 and 3 show the particles of three substances at room temperature and pressure. 1 2 3 Which of these substances are correctly represented by the corresponding diagram? 1 2 3 A argon mercury dry ice B ethane sodium chloride mercury C ethanol hydrogen chloride copper D water helium zinc 2 The set–up below shows how the relative rate of diffusion of gas X and Y can be determined. Which pair of substances could X and Y be if the water level at Z increases? X Y A argon ethane B neon carbon monoxide C oxygen methane D carbon dioxide nitrogen Z gas X gas Y water level at Z

3 KCPSS 2024/Sec 4Exp Prelim Chem P1 [Turn Over 3 The diagram shows a simple laboratory set -up used to prepare and collect a dry gas. Which pair of reagents would be most suitable to prepare the gas produced using this set-up? solid A solution B A ammonium chloride sodium hydroxide B magnesium sulfuric acid C potassium carbonate aqueous ammonia D sodium hydroxide hydrochloric acid solid A anhydrous calcium chloride gas syringe solution B

4 KCPSS 2024/Sec 4Exp Prelim Chem P1 [Turn Over 4 The three main components of liquid air are nitrogen, oxygen and argon. Their respective boiling points are: nitrogen: –196°C oxygen: –183°C argon: –186°C Liquid air can be separated into its three main components by fractional distillation. The graph shows the temperature of a liquid air mixture as it is heated. In section P of the graph, the mixture remaining consists of A liquid nitrogen and argon only. B liquid nitrogen only.