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. C liquid oxygen and argon only. D liquid oxygen only. temperature / °C time / min L M N O P Q R L M N O P Q R

5 KCPSS 2024/Sec 4Exp Prelim Chem P1 [Turn Over 5 The diagram shows the chromatogram obtained from the analysis of a dye mixture. Four measurements are shown in the diagram below. What is the Rf value of the most soluble dye? A 0.20 B 0.80 C 1.25 D 5.00 6 The solubilities of three solids in water and tetrachloromethane are given in the table below. solid solubility in water solubility in tetrachloromethane sand not soluble not soluble sodium chloride good not soluble sulfur not soluble good Which of the experimental procedures would be suitable for obtaining pure sand from a mixture of sand, sodium chloride and sulfur? A Add tetrachloromethane and stir, then filter to collect residue. B Add tetrachloromethane and stir, then filter. Add the residue to water and stir, then filter to collect residue. C Add water and stir, then filter. Add tetrachloromethane to filtrate and stir, then evaporate to dryness. D Add water and stir, then filter. Evaporate the filtrate to dryness. 10 cm 8 cm 6 cm 2 cm solvent front starting line

6 KCPSS 2024/Sec 4Exp Prelim Chem P1 [Turn Over 7 Which pair of statement correctly describes the properties of the compound iron(II) sulfide, FeS, and a mixture of iron and sulfur? iron(II) sulfide mixture of iron and sulfur 1 The ratio of iron to sulfur is always 2 : 1. The ratio of iron to sulfur can vary. 2 Iron(II) sulfide has the same properties as iron and sulfur. The mixtures do not have the same properties as iron and sulfur. 3 Iron and sulfur react when heated to form iron(II) sulfide. Iron and sulfur mix together with no energy change. A 1 and 2 B 1 and 3 C 3 only D All the above 8 An ion of formula X2– contains 10 electrons. If the relative atomic mass of X is 16, what is present in the nucleus of the ion? A 8 protons and 8 neutrons B 10 protons and 6 neutrons C 10 protons and 10 neutrons D 12 protons and 8 electrons 9 Which compound contains both ionic and covalent bonds? A ammonia B barium chloride C methyl propanoate D potassium sulfate

7 KCPSS 2024/Sec 4Exp Prelim Chem P1 [Turn Over 10 Which substance has metallic bonding? substance electrical conductivity property of product formed from the reaction between substance and oxygen in solid state in molten state A X X reacts with alkali B X ✓ no reaction with acid or alkali C ✓ ✓ reacts with alkali D ✓ ✓ reacts with both acid and alkali 11 An investigation of the properties of the chlorides of Period 3 elements shows that the boiling points of sodium chloride and silicon tetrachloride are 1465°C and 57°C respectively. This difference in boiling points is a result of A covalent bonds being weaker than ionic bonds. B metallic character decreasing across the period. C silicon forming weaker bonds with chlorine as compared to sodium. D silicon tetrachloride having weak intermolecular forces of attraction. 12 Two comments about hydrogen chloride are made below. Comment 1: Hydrogen chloride has strong covalent bonds in its simple molecular structure. Comment 2: Hydrogen chloride is soluble in water. Which statement is correct? A Both comments are correct and comment 1 explains comment 2. B Both comments are correct but comment 1 does not explain comment 2. C Both comments are incorrect. D Comment 2 is correct but comment 1 is incorrect.

8 KCPSS 2024/Sec 4Exp Prelim Chem P1 [Turn Over 13 Bismuth is in the same group as nitrogen in the Periodic Table. What is the chemical formula of lithium bismuthide? A Li3Bi B LiBiO3 C LiBi3 D Li3BiO 14 Which substance contains the greatest number of atoms in 1g? A CO2 B NO C O3 D SO3 15 200 cm 3 of ammonia burns in 100 cm3 of oxygen according to the following equation: 4NH3 + 3O2 → 2N2 + 6H2O What volume of gas will be collected at the end of the reaction when cooled to room temperature? A 66.7 cm3 B 100.0 cm3 C 133.3 cm3 D 333.3 cm3

9 KCPSS 2024/Sec 4Exp Prelim Chem P1 [Turn Over 16 Magnesium oxide is produced by heating magnesium carbonate. MgCO3 → MgO + CO2 When 84 g of magnesium carbonate is heated, 34 g of magnesium oxide is produced. What is the percentage yield of magnesium oxide? [Mr: MgCO3, 84; MgO, 40] A 34 40 × 100 B 34 84 × 100 C 40 34 × 100 D 84 × 34 40 × 100 17 20.0 cm3 of 0.500 mol/dm3 hydrochloric acid were added to 0.7 g of a sample of sodium carbonate containing some sodium chloride as impurity. The excess acid was neutralised by 1 0.0 cm 3 of 0.400 mol/dm 3 of sodium hydroxide solution. What is the percentage purity of the sodium carbonate in the sample? [Mr: HCl, 36.5; Na2CO3, 106