2022 BBSS Chem Prelims P1

This document consists of 16 printed pages. 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. 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 16. The use of an approved scientific calculator is expected, where appropriate. Name: ………………………………………………… Index no: ………... Class: ……..…. Bukit Batok Secondary School PRELIMINARY EXAMINATIONS 2022 SECONDARY 4 EXPRESS CHEMISTRY Paper 1 Multiple Choice 6092/01 24 Aug 2022 1105–1205 1 hour Additional Materials: Multiple Choice Answer Sheet ��

BBSS/PRELIMS/2022/Sec4E/Chem/6092/1 Applying past knowledge to new situations 2 1 An impure sample of X melts at around 90°C. What is most likely to be the melting point of pure X? A below 80°C B between 85°C and 90°C C between 90°C and 95°C D cannot be determined 2 A student is given a mixture of oil, sand and copper(II) sulfate solution and is required to produce from the mixture, separate samples of oil, sand and copper(II) sulfate. The student is supplied with filtration apparatus(F), a separating funnel(S) and an evaporating dish(E). Which is the correct order of the apparatus used to separate the mixture? A E, F, then S B F, E, then S C F, S, then E D S, F, then E 3 Which statements about kinetic particle theory are incorrect? 1. When a solid is heated, its particles melt. 2. All particles move at a constant speed. 3. Ethene particles move faster than carbon monoxide. A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3 4 Statements A to D refer to an imaginary element discovered in a meteoroid. Which statement most strongly suggests that the element is a non-metal? A It forms an acidic oxide. B It is soluble in water. C It is a conductor of electricity. D It reacts vigorously with chlorine. ��

BBSS/PRELIMS/2022/Sec4E/Chem/6092/1 Applying past knowledge to new situations 3 5 Two particles have the same number of protons and neutrons but different number of electrons. What can be inferred about the two particles? A They are an atom and an ion of different elements. B They are an atom and an ion of the same element. C They are an atom and an isotope of different elements. D They are an atom and an isotope of the same element. 6 Elements D, E and G are atoms with proton numbers 3, 8 and 17 respectively. What are the formulae of their hydrides formed? D E G A DH HE2 HG B DH H2E HG C DH2 HE2 HG7 D DH3 H2E H7G 7 Which row shows the substance in the order of their melting points? highest lowest A chlorine fluorine potassium diamond B diamond potassium chlorine fluorine C diamond potassium fluorine chlorine D potassium diamond chlorine fluorine 8 Which statement explains why sodium chloride has a lower melting point than magnesium oxide? A Sodium chloride is covalent but magnesium oxide is ionic. B Sodium is more reactive than magnesium. C The attraction between the ions in sodium chloride is weaker than that between the ions in magnesium oxide. D The melting point of sodium is lower than that of magnesium. ��

BBSS/PRELIMS/2022/Sec4E/Chem/6092/1 Applying past knowledge to new situations 4 9 Carbon disulfide is used in manufacturing polymers and fibres. Which statement about carbon disulfide is correct? A It has a high boiling point. B It has a giant molecular structure. C It is a simple covalent compound with single covalent bonds only. D It is insoluble in water. 10 A carbohydrate has the formula (CH2O)6. 0.50 mole of this carbohydrate is burned in excess oxygen and the gas formed is collected. What volume of gas, measured at room temperature and pressure, is collected? A 12 dm3 B 24 dm3 C 72 dm3 D 144 dm3 11 The formula of an oxide of element Y is Y2O3. 16.0 g of the oxide contains 11.2 g of Y. How many moles of Y does 11.2 g of the element contain? A 4.8 16 X 2 3 B 4.8 16 X 3 2 C 8 16 X 3 2 D 8 16 X 3 2 12 The equations show the reactions involved in the formation of nitric acid, HNO3, from nitrogen. N2 + O2 → 2NO 2NO + O2 → 2NO2 4NO2 + 2H2O + O2 → 4HNO3 How many moles of nitric acid are formed from 1.00 mole of nitrogen? A 0.50 B 1.00 C 2.00 D 4.00 ��

BBSS/PRELIMS/2022/Sec4E/Chem/6092/1 Applying past knowledge to new situations 5 13 Bromopropane, C3H7Br, can be made from propanol using the reaction shown. C3H7OH + HBr → C3H7Br + H2O In an experiment, 8 g of propanol produced 10 g of bromopropane. What is the percentage yield of bromopropane? A 40.7% B 48.8% C 61.0% D 80.0% 14 In a volumetric experiment involving the addition of hydrochloric acid to 25.0 cm3 of aqueous sodium hydroxide, it is necessary to determine when the reaction is just completed. Which piece of apparatus could be used to determine the end-point of the reaction? A electronic balance B gas syringe C stopwatch D thermometer 15 A salt, S, is dissolved in water to give a green solution. On adding chlorine, the green solution turned yellow. On addition of aqueous sodium hydroxide, the green solution gave a green precipitate and the yellow solution gave a red-brown precipitate. On addition of dilute nitric acid followed by aqueous silver nitrate, the green solution gave a white precipitate. What is the formula of S? A CuCl2 B FeCl2 C FeCl3 D FeSO4 16 Which pair of reagents can be used to prepare an aqueous solution containing copper(II) chloride as the only salt? A copper metal and dilute hydrochloric acid B copper(II) nitrate and aqueous sodium chloride C copper(II) oxide and dilute hydrochloric acid D copper(II) sulfate and dilute hydrochloric acid ��

BBSS/PRELIMS/2022/Sec4E/Chem/6092/1 Applying past knowledge to new situations 6 17 The following reactions are carried out. reaction result ammonium chloride is warmed with sodium hydroxide solution ethanoic acid is added to an aqueous solution of ammonia sulfuric acid is added to an ammonium carbonate gas P is given off compound Q is formed gas R is given off What are P, Q and R? gas P compound Q gas R A ammonia ammonium carbonate carbon dioxide B ammonia ammonium ethanoate carbon dioxide C ammonia ammonium ethanoate ammonia D chlorine ammonium ethanoate ammonia 18 On bubbling carbon dioxide into an aqueous solution of X, a white precipitate, Y, is formed. This precipitate dissolves when more carbon dioxide is bubbled through, forming a colourless solution of Z. What are the formulae of X, Y and Z? X Y Z A CaCO3 Ca(OH)2 Ca(HCO3)2 B CaCO3 Ca(HCO3)2 Ca(OH)2 C Ca(OH)2 CaCO3 Ca(HCO3)2 D Ca(OH)2 Ca(HCO3)2 CaCO3 19 Elements X and Y are in Group VII of the Periodic Table. X is a liquid at room temperature. Y is a gas at room temperature. Which statemen