2023 HYSS Prelim ScChem 4NA P3

1 4N Science (Chemistry) P3 Preliminary Examination Hua Yi Secondary School Name: Index Number: Class: HUA YI SECONDARY SCHOOL Paper 3 & 4: 1 hour 15 minutes 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 the Answer Sheet in the spaces provided. Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. There are twenty 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. This document consists of 8 printed pages including the cover page. © HYSS 2023 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 4NA 4NA For Examiner’s Use Paper 3 SCIENCE (CHEMISTRY) 5105/03 Paper 3 Multiple Choice 2 August 2023 Preliminary Examination 5107/03

2 4N Science (Chemistry) P3 Preliminary Examination Hua Yi Secondary School 1 The boiling point of liquid X is lower than that of water. A student places a mercury thermometer in boiling liquid X. The diagram represents part of the stem of this thermometer without numbers. What is the boiling point of liquid X? A 75.5 o C B 84.5 o C C 104.5 o C D 105.5 o C 2 A student is given a mixture of three substances P, Q and R. The table shows some of the properties of P, Q and R. substance state solubility in water solubility in ethanol P solid yes no Q liquid no yes R solid no no Which method describes how a pure sample of substance Q can be separated from the original mixture? A add ethanol, filter, distil the filtrate B add ethanol, filter, add water to residue, filter C add water, filter, dry the residue D add water, filter, add ethanol to residue, filter 3 Which of the following occurs when water vapour condenses? space between particles energy of particles A decreases increases B decreases decreases C increases decreases D increases increases mercury

3 4N Science (Chemistry) P3 Preliminary Examination Hua Yi Secondary School 4 Which diagram shows a mixture of one element and one compound? A B C D 5 Which row has a value of +1? A relative charge of proton B relative charge of electron C relative mass of electron D relative mass of neutron 6 A student makes some crystals. How does the student test the purity of the crystals? A check the melting point of the crystals B observe the shape of the crystals C measure the size of the crystals D test the solubility of the crystals in water 7 The formulae of two ionic compounds of chromium are CrCl2 and Cr2(CO3)3. What are the charges on the chromium ions in these compounds? CrCl2 Cr2(CO3)3 A 2- 3- B 2+ 2+ C 2+ 3+ D 2+ 6+

4 4N Science (Chemistry) P3 Preliminary Examination Hua Yi Secondary School 8 The pH of a solution is found to be 13. Which of the following substances will react with this solution to produce a gas that turns red litmus paper blue? A ammonium nitrate B calcium carbonate C nitric acid D sodium hydroxide 9 In an experiment, equal portions of lime are added to 30 cm3 of vinegar. The graph shows the pH of the vinegar after each portion is added. How many portions of lime are required to neutralise 60 cm3 of vinegar? A 3 B 6 C 8 D 14 number of portions of lime pH 12 11 10 9 8 7 6 5 4 3 2 1 0 0 1 2 3 4 5 6 7

5 4N Science (Chemistry) P3 Preliminary Examination Hua Yi Secondary School 10 Which of the following solutions, when mixed together, form an insoluble salt? A dilute sulfuric acid and lead(II) nitrate B dilute hydrochloric acid and barium nitrate C dilute sulfuric acid and magnesium chloride D dilute hydrochloric acid and magnesium sulfate 11 A student is given dilute sulfuric acid and the four solids listed below. 1 copper 2 copper(II) carbonate 3 copper(II) chloride 4 copper(II) oxide Which of these solids cannot be reacted with dilute sulfuric acid to obtain copper(II) sulfate? A 1 and 2 only B 1 and 3 only C 2 and 3 only D 2 and 4 only 12 Which statement(s) about the general properties of metals is/are correct? 1 conduct electricity when solid 2 form acidic oxide 3 high melting point A 1 only B 2 only C 1 and 3 D 2 and 3

6 4N Science (Chemistry) P3 Preliminary Examination Hua Yi Secondary School iron painted iron air water 13 Which row describes the properties of a simple covalent substance? boiling point electrical conductivity solid liquid A high poor poor B high good good C low poor poor D low good good 14 In the Periodic Table, how does the metallic character of the elements change from left to right across a period? A It decreases. B It increases. C It increases, then decreases. D It remains the same. 15 The experiment shown in the diagram is set up to show if paint affects rusting. The apparatus is left for one month. What happens to the water level in test tubes P and Q? test tube P test tube Q A falls rises B no change rises C rises falls D rises no change P Q

7 4N Science (Chemistry) P3 Preliminary Examination Hua Yi Secondary School 16 More than 90 % of all gold is recycled but less than 50 % of iron is recycled. Based on economic grounds, what is the main reason for this difference? A Disposal of gold will cause more pollution than disposal of iron. B Gold is scarcer and more valuable than iron. C Gold will run out faster than iron. D It is easier to recycle gold than iron. 17 Statement 1: The burning of fossil fuels containing sulfur is a cause of ‘acid rain’. Statement 2: Acid rain is formed from sulfur dioxide which is produced w hen s ulfur compounds burn. Which of the following is true? A Both statements are correct and statement 2 explains statement 1. B Both statements are correct, but statement 2 does not explain statement 1. C Statement 1 is correct but statement 2 is incorrect. D Statement 2 is correct but statement 1 is incorrect. 18 Which of the following statements about compounds in a homologous series is false? A They have same functional group. B They have same molecular formula. C They have similar chemical properties. D They show a gradual change in physical properties. 19 Which of the following equations represents a substitution reaction? A C2H4 + H2 → C2H6 B C3H6 + Cl2 → C3H6C