BGSS 2024 P2 QP & ANS MS

Name: Register Number: Class: 4E BEDOK GREEN SECONDARY SCHOOL Preliminary Examination 2024 4E CHEMISTRY 6092/01 Paper 1 Multiple Choice 27 August 2024 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. Write your name, register number and class on the multiple choice answer sheet provided. Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. There are forty questions in this paper. Answer all questions. For each question, there are four possible answers, A, B, C and D. Choose the one you consider to be correct and record your choice in soft pencil on the separate Answer Sheet. Read very carefully the instructions on the Answer Sheet very carefully . INFORMATION FOR CANDIDATES 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 15. The use of an approved scientific calculator is expected, where appropriate. This document consists of 15 printed pages including the cover page. © BGSS 2024 No part of this document may be reproduced in any form or transmitted in any form or by any means without the prior permissio n of Bedok Green Secondary School [Turn Over

2 ©BGSS 2024 [Turn Over 1 The diagram shows an experimental setup for the preparation and collection of a dry gas. Which gas can be collected in this way? A oxygen B carbon dioxide C chlorine D sulfur dioxide 2 An organic solvent, hexane and aqueous sodium chloride are accidentally mixed together. Which of the following shows the most efficient methods of separation to obtain pure samples of hexane and solid sodium chloride? A filtration followed by crystallisation B fractional distillation followed by evaporation to dryness C simple distillation followed by crystallisation D using a separating funnel followed by evaporation to dryness fused calcium chloride

3 ©BGSS 2024 [Turn Over 3 The diagram shows a setup to distil a mixture of propanol (boiling point 88 °C) and heptane (boiling point 98 °C). Which graph correctly shows the changes in volume of distillate in the conical flask as the distillation proceeds? A B C D 4 When 50 cm3 of pure ethanol is mixed with 50 cm3 of pure water in a measuring cylinder, the total volume of mixture is found to be 97 cm3. What is the best explanation for this observation? A A small volume of the ethanol has evaporated. B The ethanol and water molecules react to form another compound. C The ethanol molecules have a random arrangement in water. D The ethanol molecules move into empty spaces between the water molecules. water out boiling flask mixture of liquids water in heat volume of distillate / cm3 volume of distillate / cm3 volume of distillate / cm3 volume of distillate / cm3 temperature / °C temperature / °C temperature / °C temperature / °C 98 88 98 88 98 88 98 88

4 ©BGSS 2024 [Turn Over 5 The heating curve of an impure sample of substance X is shown below. What are the melting point and boiling point of pure substance X? melting point / °C boiling point / °C A 45 129 B 47 128 C 48 127 D 49 130 6 Nitrogen gas is allowed to diffuse across a narrow hollow tube as shown below. Which of the following changes will increase the rate of diffusion of the gas through the tube? I increasing the temperature of the gas from 25 °C to 45 °C II lowering the pressure from 1 atm to 0.5 atm III replacing the nitrogen gas with carbon monoxide gas A I only B I and II C I and III D II and III 7 The equation illustrates the ion-molecule interaction in gas clouds involving 1 1 H2+ (g) + H2 (g) → H (g) + H 3+ (g) What are the number of subatomic particles present in a H3+ ion? number of neutrons number of protons number of electrons A 0 3 1 B 0 3 2 C 3 2 1 D 3 3 2 nitrogen gas narrow hollow tube temperature / °C time / min 129 127 48 45 H.

5 ©BGSS 2024 [Turn Over 8 Which statement(s) correctly describe(s) properties of a compound, copper( II) sulfide and a mixture of copper and sulfur? copper(II) sulfide compound mixture of copper and sulfur 1 copper and sulfur react when heated to form copper(II) sulfide copper and sulfur mix together without any heat involved 2 the ratio of copper to sulfur is always 1:1 the ratio of copper to sulfur in the mixture can vary 3 copper(II) sulfide has the properties of copper and sulfur the mixture does not have the properties of copper and sulfur A 1 only B 1 and 2 C 2 and 3 D 1, 2 and 3 9 The diagram shows the structure of graphite. A sample of graphite was completely combusted in oxygen to form a gaseous oxide. Which of the following are the structures of graphite and the gaseous oxide? graphite gaseous oxide A crystal lattice structure crystal lattice structure B giant covalent structure giant covalent structure C giant covalent structure simple molecular structure D simple molecular structure simple molecular structure 10 The equation shows the reaction between element Y and dilute sulfuric acid. 2Y (s) + H2SO4 (aq) → X2SO4 (aq) + H2 (g) What types of bonding are present in element Y and in compound Y2SO4? element Y compound Y2SO4 A covalent covalent B covalent ionic and covalent C metallic covalent D metallic ionic and covalent

6 ©BGSS 2024 [Turn Over 11 When hydrogen peroxide is used as a bleaching agent, it decomposes to form water and oxygen. 2H2O2 → 2H2O + O 2 When 68 g of hydrogen peroxide decomposes, the volume of oxygen gas collected under room temperature and pressure is 1200 cm 3. What is the percentage purity of hydrogen peroxide? A 2.5 % B 5.0 % C 10.0 % D 50.0 % 12 0.2 mol/dm3 of dilute sulfuric acid is titrated with 0.5 mol/dm3 aqueous potassium hydroxide. What is the volume of aqueous potassium hydroxide required to react completely with V dm3 of dilute sulfuric acid? A 0.1 V dm3 B 0.4 V dm3 C 0.8 V dm3 D 1.6 V dm3 13 The main compound in glass is silicon dioxide. Which of the following chemicals can be added into sewage pipes to dissolve glass fragments trapped in them? A sodium hydroxide B dilute sulfuric acid C ethanol D tetrachloromethane 14 Which ionic equation describes the reaction between solutions of ammonium carbonate and sodium hydroxide? A H+ (aq) + OH− (aq) → H2O (l) B 2H+ (aq) + CO32− (aq) → CO2 + H2O (l) C 2Na+ (aq) + CO32− (aq) → Na2CO3 D NH4+ (aq) + OH− (aq) → NH3 (g) + H2O (l) 15 The table contains data about two acids. acid concentration (mol/dm3) pH hydrochloric acid 0.1 1.0 ethanoic acid 0.1 3.7 Why of the following statements best explains the difference in pH values? A Ethanoic acid contains carbon, hydrogen and oxygen. B Ethanoic acid has larger molecules. C Hydrochloric acid partially ionises. D Hydrochloric acid releases more H+ ions in water.

7 ©BGSS 2024 [Turn Over 16 A mixture of the oxides of two elements from Period 3 of the Periodic Table is dissolved in water. This solution is approximately neutral. What could be the constituents of the mixture? A Al2O3 and MgO B Na2O and MgO C SO3 and P4O10 D Na2O and P4O10 17 Which sequence of steps is used to collect a pure, dry sample of magnesium sulfate crystals? step 1 step 2 step 3 step 4 A add acid in excess to magnesium carbonate filter evaporate to dryness leave to cool B add a