Chem S3 EOY 2023 HYSS P1, P2

Name: Index Number: Class: HUA YI SECONDARY SCHOOL Summative Review CHEMISTRY 6092/1 Paper 1 2 October 2023 1 hour 45 minutes Paper 1 and 2 Candidates answer on the Multiple Choice Answer Sheet provided. 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 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. For Examiner’s Use Paper 1 This document consists of 9 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 Setter: Ms Tok Peilin 3-G3 3-G3

2 HYSS 3G3 Chemistry SR 2023 Hua Yi Secondary School 1 The diagram shows the reading on a burette at the start and end of an experiment. What volume of the liquid was removed from the burette? A 25.80 cm3 B 26.60 cm3 C 27.40 cm3 D 28.20 cm3 2 Which of the following best describes a pure substance? A A colourless solution obtained from filtration. B A white solid with a density of 2 g/cm3. C A white solid that does not dissolve in water or organic solvents. D A yellow solid that melts at 60 °C. 3 The boiling point of water is 100 ºC. The melting point of sodium chloride is 800 ºC. What is the most likely boiling point of a sample of water that contains a small quantity of sodium chloride? A 96 °C B 104 °C C 450 °C D 804 °C 4 Mercury is a liquid at 25 °C. What is the melting point and the boiling point for mercury? melting point / °C boiling point / °C A –39 357 B –22 –3 C –8 20 D 30 103 start end

3 HYSS 3G3 Chemistry SR 2023 Hua Yi Secondary School 5 The solubility of three solids in two solvents, water and methylbenzene, is given in the following table. solid solubility in water solubility in methylbenzene P insoluble insoluble Q good insoluble R insoluble good What method would be suitable for obtaining P from a mixture of the three solids? A Add methylbenzene and stir; then filter. B Add methylbenzene and stir; then filter; then add the residue to water and stir; and then filter this mixture. C Add water and stir; then filter; then add methylbenzene to the filtrate and stir; then evaporate the solvent. D Add water and stir; then filter; then evaporate the filtrate to dryness. 6 Which statement about an atom is true? A The proton number can be more than the nucleon number. B The proton number of all atoms of an element is the same. C The nucleon number cannot be equal to the proton number. D The nucleon number cannot be equal to the number of electrons. 7 A stable molecule contains atoms of the elements R, T and U. Which of the following is a possible combination of the elements? R T U A C H N B F H C C P Si O D Si N S

4 HYSS 3G3 Chemistry SR 2023 Hua Yi Secondary School 8 Nitrogen and chlorine atoms combine to form the molecule shown. Cl │ Cl ─ N ─ Cl How many valence electrons are not shared in the molecule? A 3 B 6 C 18 D 20 9 Salt ST is to be prepared by reacting the carbonate of S with the acid HT using titration. What are the solubilities of the carbonate, acid and salt? carbonate of S acid HT salt ST A insoluble soluble insoluble B insoluble soluble soluble C soluble insoluble insoluble D soluble soluble soluble

5 HYSS 3G3 Chemistry SR 2023 Hua Yi Secondary School 10 Pieces of apples usually go brown when they are left in the air for a few minutes. In food-processing factories, it is important to stop this browning. The graph shows how browning is controlled by the pH of a solution. To stop this browning, cut apples are contained in solutions with different pH. Which of these solutions is most effective in preventing the browning of apples? A citric acid, pH 4 B sodium hydrogencarbonate, pH 9 C sodium hydrogen sulfate, pH 3 D water, pH 7 time needed for apple to go brown /min pH of solution 60 50 40 30 20 10 0 2 4 6 8

6 HYSS 3G3 Chemistry SR 2023 Hua Yi Secondary School 11 A new indicator has just been produced in the laboratory. It changes colour at different pH range. pH range colour 0 – 2 yellow 3 – 6 blue 7 – 14 colourless Which pair of substances can be distinguished by adding this indicator to each sample separately? A aqueous ammonia and water B aqueous ammonia and sodium hydroxide solution C dilute ethanoic acid and water D dilute hydrochloric acid and dilute sulfuric acid 12 An aqueous solution has a pH value of 1. What information does this fact imply about the ions present in the solution? concentration of H+ ions concentration of OH- ions A high low B high none C low high D low none 13 A student made four statements about elements, compounds and mixtures. statement 1: Elements and compounds have fixed melting points. statement 2: Mixtures can be separated into their components by physical means. statement 3: Elements can exist as atoms or molecules. statement 4: The properties of a compound are similar to that of its constituent elements. How many of the above statement(s) is/are incorrect? A 1 B 2 C 3 D 4

7 HYSS 3G3 Chemistry SR 2023 Hua Yi Secondary School 14 Which statement about an alkali is incorrect? A It reacts with a carbonate to form carbon dioxide. B It reacts with an acid to form a salt. C It reacts with an ammonium salt to form ammonia. D It turns Universal Indicator blue. 15 An excess of substance W was added slowly, with stirring, to solution X. The pH changes of the mixture are shown in the graph. What could W and X be? W X A insoluble metal oxide dilute nitric acid B insoluble non-metal oxide sodium hydroxide C soluble metal oxide dilute nitric acid D soluble non-metal oxide sodium hydroxide 16 Rat poison needs to be insoluble in rainwater, but soluble in the low pH of stomach contents. Which is a suitable barium compound to use as rat poison? A barium carbonate B barium chloride C barium nitrate D barium sulfate 2 7 13 pH mass of W added / cm3

8 HYSS 3G3 Chemistry SR 2023