2022 HYSS Chem Prelims P1

Name: Index Number: Class: HUA YI SECONDARY SCHOOL Preliminary Examination CHEMISTRY Paper 1 16 September 2022 1 hour Candidates answer on the Multiple Choice Answer Sheet Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write your Name, Index Number and Class on all the work you have done. Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. 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 20. For Examiner’s Use Paper 1 This document consists of 20 printed pages including the cover page. © HYSS 2022 No part of this document may be reproduced in any form or transmitted in any form or by any means without the prior permission of Hua Yi Secondary School. [Turn Over 4E 4E 6092/1 Setter: Ms Tok Peilin

2 2022 4E Pure Chemistry Preliminary P1 Hua Yi Secondary School 1 A gas turns moist red litmus blue, is soluble in water and is less dense than air. Which diagram shows a correct way of drying and collecting the gas? A B C D gas gas calcium oxide water gas gas calcium oxide concentrated sulfuric acid

3 2022 4E Pure Chemistry Preliminary P1 Hua Yi Secondary School 2 The apparatus shown is commonly used to oxidise ethanol to ethanoic acid. Which is the purpose of the condenser? A prevents air from oxidising ethanoic acid formed B prevents ethanoic acid from reforming back to ethanol C prevents ethanol from being converted to ethene D prevents the escape of any unreacted ethanol 3 Ethyl acetate is an organic compound that is insoluble in water. Given a mixture of e thyl acetate and aqueous copper(II) sulfate at room temperature, which two steps should be carried out to obtain samples of ethyl acetate and copper(II) sulfate crystals? step 1 step 2 A fractional distillation crystallisation B simple distillation evaporation C using a separating funnel crystallisation D using a separating funnel evaporation

4 2022 4E Pure Chemistry Preliminary P1 Hua Yi Secondary School 4 The diagram shows the change in electrical conductivity when aqueous barium hydroxide is added to a fixed volume of substance X. Which of the following is not a possible identity for substance X? A aqueous zinc sulfate B aqueous iron(III) nitrate C aqueous sodium fluoride D aqueous copper(II) chloride 5 Oxygen consists of two isotopes, oxygen-16 and oxygen-18. Which statement correctly describes the two isotopes of oxygen? A Both oxygen-16 and oxygen-18 have the same relative atomic mass. B Both oxygen-16 and oxygen-18 form ions with a charge of -2. C Oxygen-16 has different chemical properties from oxygen-18. D Oxygen-16 and oxygen-18 have different electronic configurations. conductivity volume of aqueous barium hydroxide / cm3

5 2022 4E Pure Chemistry Preliminary P1 Hua Yi Secondary School 6 The apparatus shown is used to investigate the diffusion of gases. It was observed that the water level of the coloured water did not change even after gas 2 was delivered into the beaker for some time. Which of the following could be the identities of gases 1 and 2? gas 1 gas 2 A C2H4 N2 B C2H6 O2 C CO2 NH3 D SO2 HCl 7 How does rubidium bond with fluorine? A Each atom of rubidium receives an electron from a fluorine atom. B Each atom of rubidium shares a pair of electrons with a fluorine atom. C Each atom of rubidium shares an electron with a fluorine atom. D Each atom of rubidium gives an electron to a fluorine atom. 8 The structural formula of ethylene molecule is shown. What is the total number of shared electrons in each ethylene molecule? A 3 B 5 C 6 D 10 porous pot gas 2 beaker coloured water gas 1

6 2022 4E Pure Chemistry Preliminary P1 Hua Yi Secondary School 9 Which statement explains why graphite and copper can conduct electricity in solid state? A Both graphite and copper contain mobile electrons. B Both graphite and copper contain mobile ions. C Graphite contains mobile electrons while copper contains mobile ions. D Graphite and copper contain both mobile electrons and mobile ions. 10 On complete combustion, a sample of hydrocarbon gives 11.0 g of carbon dioxide and 9.0 g of water. What is the molecular formula of the hydrocarbon? A CH4 B C2H4 C C3H6 D C3H8 11 The main ore of zinc is zinc blende, ZnS. When this ore is heated in air, the reaction is represented by the following equation. 2ZnS + 3O2 → 2ZnO + SO2 What volume of oxygen at room temperature and pressure would be required to react completely with 194 g of ZnS? A 3 dm3 B 2 243  dm3 C 3  24 dm3 D 3  32 dm3 12 When 20 g of impure calcium carbonate is heated, 6.6 g of carbon dioxide is obtained. What is the percentage purity of the sample of calcium carbonate? (assume that none of the impurity produce carbon dioxide on heating) A 15.0% B 25.0% C 55.0% D 75.0%

7 2022 4E Pure Chemistry Preliminary P1 Hua Yi Secondary School 13 The diagram shows an incomplete diagram of an electrolysis experiment. A student carries out the experiment above and obtains two different results 1 and 2 as shown. result 1 result 2 Which of the following correctly identifies the electrolyte used in the experiment to obtain results 1 and 2? electrolyte used to obtain result 1 electrolyte used to obtain result 2 A dilute hydrochloric acid dilute sodium chloride B concentrated hydrochloric acid dilute nitric acid C concentrated sodium chloride concentrated hydrochloric acid D dilute sodium chloride dilute nitric acid graphite electrodes electrolyte H2 Cl2 H2 O2

8 2022 4E Pure Chemistry Preliminary P1 Hua Yi Secondary School 14 A student decided to silver-plate a locker key. Which of the following combination gives the most suitable set-up for the electroplating? anode cathode electrolyte A locker key silver block sulfuric acid B locker key silver block aqueous silver nitrate C silver block locker key sulfuric acid D silver block locker key aqueous silver nitrate 15 A reversible reaction is exothermic in the forward direction and the heat given out is 196 kJ/mol. The activation energy for the forward direction is 75 kJ/mol. What is the activation energy of the reverse direction? A 75 kJ/mol B 121 kJ/mol C 196 kJ/mol D 271 kJ/mol silver block electrolyte p