2022 GMSS Chem Prelims P1

CHEMISTRY Paper 1 Multiple Choice 5073/01 Sec 4 Express 6092/01 Additional Materials: Multiple Choice Answer Sheet 1 hour 26 August 2022 READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and index number 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 20. The use of an approved scientific calculator is expected, where appropriate. This document consists of 19 printed pages and 1 blank page. [Turn over Geylang Methodist School (Secondary) Preliminary Examination 2022

2 GMS(S)/ChemP1/Prelim/2022/4E 1 A gas is evolved during a reaction. Which two pieces of apparatus would enable the rate of this reaction to be measured? A balance and pipette B gas syringe and thermometer C stopwatch and gas syringe D stopwatch and pipette 2 The table shows the colours and the solubilities in water of four solids. solid colour solubility in water W blue insoluble X blue soluble Y white insoluble Z white soluble A mixture containing two of the solids is added to excess water, stirred and filtered. A blue filtrate and a white residue are obtained. Which two solids are present in the mixture? A W and X B W and Y C X and Y D X and Z

3 GMS(S)/ChemP1/Prelim/2022/4E 3 A mixture of three liquids is separated by fractional distillation. Which statements are correct? 1 The mixture boils at constant temperature throughout the separation. 2 The temperature at which the mixture boils increases during the separation. 3 The liquid with the highest boiling point is collected first. 4 The liquid with the lowest boiling point is collected first. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4 4 Nitrogen dioxide is a dark brown gas and is denser than air. A gas jar containing nitrogen dioxide is sealed with a glass plate and is then inverted on top of a gas jar containing air. The glass plate is removed. Which one of the following correctly describes the colours inside the gas jars after a long period of time? upper gas jar lower gas jar A brown brown B dark brown light brown C colourless dark brown D light brown dark brown

4 GMS(S)/ChemP1/Prelim/2022/4E 5 The apparatus shown in the diagram was used to compare the rate of diffusion between a gas and air. A beaker containing the gas was placed over the porous pot. Which gas would cause bubbles to be observed in the beaker of water? A carbon dioxide B hydrogen C oxygen D sulfur dioxide 6 Which of the following diagrams shows the structure of bronze? 7 Tritium is an isotope of hydrogen and has the symbol T. Which formula is incorrect for a tritium compound? A CaOT B NT3 C TNO3 D T2O

5 GMS(S)/ChemP1/Prelim/2022/4E 8 The symbols for two ions are shown. Which statement is correct? A The fluoride ion contains more electrons than the sodium ion. B The sodium ion contains more neutrons than the fluoride ion. C The two ions contain the same number of electrons as each other. D The two ions contain the same number of protons as each other. 9 Which diagram shows the outer electron arrangement in calcium fluoride?

6 GMS(S)/ChemP1/Prelim/2022/4E 10 Which statement shows that graphite and diamond are different forms of the element carbon? A Both graphite and diamond have giant molecular structures. B Complete combustion of equal masses of graphite and diamond produces equal masses of carbon dioxide and no other products. C Graphite and diamond have different melting points. D Graphite conducts electricity, whereas diamond does not. 11 An investigation of the properties of the chlorides of Period III elements shows that the boiling points of sodium chloride and silicon tetrachloride are 1465 oC and 57 oC respectively. This difference in boiling points is a result of A covalent bonds being weaker than ionic bonds. B sodium chloride having strong metallic bonds. C silicon tetrachloride having weak intermolecular forces of attraction. D silicon forming weaker bonds with chlorine than does sodium. 12 An organic compound contains 24 g of carbon, 4 g of hydrogen and 32 g of oxygen. What is the empirical formula of the compound? A CHO B CH2O C CH4O D C2H4O2 13 In an electrolysis experiment, the same amount of charge that deposited 32g of copper deposited 26g of chromium. What is the formula of the chromium ion? A Cr+ B Cr2+ C Cr3+ D Cr4+

7 GMS(S)/ChemP1/Prelim/2022/4E 14 Which statement about the properties of the elements in Group 0 of the Periodic Table, helium to xenon, is correct? A Argon reacts with iron to form a compound. B Helium is less dense than air. C The elements change from gas to solid down the group. D The elements exist as covalent molecules. 15 The table below shows the electronic structure of five elements V, W, X, Y and Z. element electronic structure V W X Y Z 2, 8, 1 2, 8, 7 2, 8 2, 1 2, 6 Which one of the following statements is not true? A V and Y belong to the same Group in the Periodic Table. B V and W belong to the same Period in the Periodic Table. C W, X and Z are non-metallic elements. D X and Z belong to the same Group in the Periodic Table. 16 The following observations were made when nickel and iron were placed separately into solutions of metals P, Q and R. salt solution of P salt solution of Q salt solution of R nickel displaced not displaced not displaced iron displaced displaced not displaced What is the correct order in decreasing reactivity of the five metals? A P, Ni, Fe, Q, R B R, Fe, Ni, Q, P C R, Fe, Q, Ni, P D R, Q, Fe, Ni, P

8 GMS(S)/ChemP1/Prelim/2022/4E 17 The position of metal M in the reactivity series is shown. K, M, Al, Zn, Fe, Cu, Ag Which method will be used to extract M from its ore? A electrolysis of its molten chloride B electrolysis of its aqueous sulfate C reduction of its oxide by heating with coke D reduction of its oxide by heating with hydrogen 18 An unknown solid Y has the following properties. • Y is stable to heat. • When dilute acid is added to Y, effervescence of a colourless gas is observed. • Y dissolves in water to form a colourless solution. • When aqueous sodium hydroxide is added until in excess to the solution, no visible reaction is observed. What could be the identity of solid Y? A calcium oxide B sodium carbonate C zinc metal D zinc carbonate

9 GMS(S)/ChemP1/Prelim/2022/4E 19 Substance Y was added bit by bit, with stirring, to aqueous solution Z. The changes in pH of the mixture are shown in the graph. What could Y and Z be? Y Z A aluminium oxide hydrochloric acid B calcium oxide nitric acid C sodium oxide ethanoic acid D zinc oxide propanoic acid 20 Which of the following oxides will not react with sulfuric acid? A barium oxide B nitrogen dioxide C sodium oxide D zinc oxide

10 GMS(S)/ChemP1/Prelim/2022/4E 21 Which of