2022 GDLSS Chem Prelims P1

Greendale Secondary School 1 Sec 4 Express Preliminary Examination 2022 Chemistry Name: ( ) Class: GREENDALE SECONDARY SCHOOL Preliminary Examination 2022 CHEMISTRY 6092/01 Paper 1 Multiple Choice Secondary 4 Express 31 August 2022 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and register number on the Answer Sheet and on the Question Paper 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 on this question paper. A copy of the Periodic Table is printed on Page 18. The use of an approved scientific calculator is expected, where appropriate. This document consists of 18 printed pages. [Turn over ���

Greendale Secondary School 2 Sec 4 Express Preliminary Examination 2022 Chemistry 1 A student put exactly 25.0 cm3 of dilute hydrochloric acid into a conical flask. The student added 2.5 g of solid sodium carbonate and measured the change in temperature of the mixture. Which apparatus does the student need to use? A balance, measuring cylinder, thermometer B balance, pipette, stopwatch C balance, pipette, thermometer D burette, pipette, thermometer 2 The tubes shown all contain a dilute solution of a solid X dissolved into a liquid Y. Which apparatus is most suitable for finding the boiling point of liquid Y? A B C D 3 Which description of brass are correct? 1 It is an alloy. 2 It is a mixture. 3 It is a non-metal. A 1 only B 1 and 2 only C 2 and 3 only D 3 only ���

Greendale Secondary School 3 Sec 4 Express Preliminary Examination 2022 Chemistry 4 Which one of the following correctly describes the particles in a dilute sugar solution at room temperature? sugar molecules water molecules A widely separated, moving at random close together, moving at random B widely separated, moving at random close together, not moving C close together, moving at random widely separated, moving at random D close together, vibrating slightly close together, moving at random 5 The diagram shows a diffusion experiment. Which gas, when present in the beaker over the porous pot, will cause water level at Y to initially rise? A CO2 B Cl2 C CH4 D NO2 ���

Greendale Secondary School 4 Sec 4 Express Preliminary Examination 2022 Chemistry 6 The apparatus shown is used to prepare carbon monoxide. What is the purpose of the aqueous potassium hydroxide? A to absorb any oxygen formed B to cool the carbon monoxide C to dry carbon monoxide D to remove traces of carbon dioxide 7 A bottle of copper(II) oxide has been contaminated with some solid sodium chloride. How can the sodium chloride be removed from the copper(II) oxide? A Place the mixture in a separating funnel. B Heat the mixture and allow it to cool. C Add aqueous silver nitrate to the mixture and filter. D Add water to the mixture and filter. 8 A particle consists of three electrons, four protons and five neutrons. Which of the statement about the particle are correct? 1 The particle has an atomic number of 3. 2 The particle has a mass number of 7. 3 The particle has a charge of 1+. A 1 and 2 only B 1 and 3 only C 2 and 3 only D 3 only carbon dioxide carbon heat aqueous potassium hydroxide concentrated sulfuric acid ���

Greendale Secondary School 5 Sec 4 Express Preliminary Examination 2022 Chemistry 9 Three dry test-tubes were filled with different gases and placed in a trough of water. After a short time, the water had risen in two of the tubes as shown. Which gases could the tubes have contained? tube 1 tube 2 tube 3 A ammonia carbon dioxide hydrogen B ammonia hydrogen carbon dioxide C carbon dioxide ammonia oxygen D oxygen ammonia carbon dioxide 10 The elements T, X and Y have consecutive, increasing atomic numbers. If element T is a noble gas, what will be the symbol for the ion of element Y in its compounds? A Y+ B Y2+ C Y2– D Y– 11 What are the different forms for the same element in the same physical state called? A allotropes B isomers C isotopes D polymers water tube 1 tube 2 tube 3 ���

Greendale Secondary School 6 Sec 4 Express Preliminary Examination 2022 Chemistry 12 The results of a paper chromatography experiment are shown. X is an aqueous solution of a salt of a Group I element. Y is an aqueous solution of a salt of a transition element. Which row is correct? larger Rf value requires a locating agent A X X B X Y C Y X D Y Y 13 Hydrogen gas is produced when sodium is added to water. What is the volume of hydrogen gas, measured at r.t.p., produced when 18.4 g of sodium reacts with excess water? A 9.6 dm3 B 15.0 dm3 C 19.2 dm3 D 30.0 dm3 14 Iron can be electroplated with zinc to make it resistant to corrosion. Which row about electroplating iron with zinc is correct? positive electrode negative electrode electrolyte A iron zinc iron(II) nitrate B iron zinc zinc nitrate C zinc iron iron(II) nitrate D zinc iron zinc nitrate ���

Greendale Secondary School 7 Sec 4 Express Preliminary Examination 2022 Chemistry 15 Element P has an electronic configuration of 2.8.6. Element R has an electronic configuration of 2.8.8.1. What is likely to form if P and R combine? A a covalent compound RP B a covalent compound R2P C an ionic compound RP D an ionic compound R2P 16 One mole of compound Q gives three moles of ions in aqueous solution. Q reacts with ammonium carbonate to give an acidic gas. What is compound Q? A calcium hydroxide B nitric acid C sodium hydroxide D sulfuric acid 17 124 g of phosphorus vapour has the same volume as 71 g of chlorine gas at the same temperature and pressure. What is the formula of a molecule of phosphorus? A P8 B P4 C P2 D P 18 When electrolysed using inert electrodes, which dilute solution would produce the greatest increase in mass of the negative electrode? [Ar: Al, 27; Cu, 64; Pb, 207; Ag, 108] ���

Greendale Secondary School 8 Sec 4 Express Preliminary Examination 2022 Chemistry 19 Which of the following involves the largest number of electrons for complete discharge during electrolysis? A 5 moles of OH– ions B 6 moles of Cu2+ ions C 7 moles of O2– ions D 12 moles of Na+ ions 20 High carbon steel is used in manufacturing processes. Which properties does high carbon steel have? 1 It is brittle. 2 It is malleable. 3 It is soft. 4 It is strong. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4 21 The table shows the energy released by the complete combustion of some compounds used as fuel. compound Mr ∆H in kJ/mol methane 16 – 880 ethanol 46 – 1380 propane 44 – 2200 heptane 100 – 4800 Which fuel produces the most energy when 1 g of the compound is completely burned? A ethanol B heptane C methane D propane ���

Greendale Secondary School 9 Sec 4 Express Preliminary Examination 2022 Chemistry 22 Four cells were set up using aqueous sodium chloride as the electrolyte. In each cell, only the underlined electrode dissolved. To