2023 Sec 4 Pure Chemistry Prelim Catholic High with Answer

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BP- 100 Name: CATHOLIC HIGH SCHOOL Preliminary Examination Secondary 4 (O-Level Programme)wGHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 6092/0r 29 August 2023 'l hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, pencil clips, glue or conection fluid. Write your name, index number and class on the Answer Sheet in the spaces provided There are forty questions in this Paper. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the one you consider conect and record your choice in soft poncil on the separate Answer Sheet. Each conecl 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 given on page 19. The use of an approved scientific calculator is expected, where appropriate. For examineds use only: Total 140 This document consists of 19 printed pages. PartnerlnLeaming 98 I lndex Number: I I ctass: I I

BP- 1 01 1 The diagrams show four different methods of collecting gases. Which method is suitable for collecting a gas which has the properties described? method for collecting gas properties of gas A B G D 1 2 3 4 less dense than air and soluble in water denser than air and soluble in water less dense than air and soluble in water denser than air and insoluble in water 2 A mixture of three liquids is separated by fractional distillation in the school laboratory. Which two statements are conect? 1 A pure sample of each liquid can be obtained after separation. 2 The mixture boils at constant temperature throughout the separation. 3 The three liquids are miscible with each other. 4 The three liquids are collected at the same time at difierent parts of the fractionating column. A 1and3 B 'l and4 C 2and3 O 2and 4 42 PartnerlnLearning oo 1

BP- 102 3 When heated, magnesium reacts with oxygen in the air to form magnesium oxide, a white powder. A student wants to investigate the percentage purity of a piece of magnesium ribbon. The student is given a balance and three sets of apparatus shown. 1 2 3 magnesium Rmetal tongs burning magnesium heat Which sets of apparatus are suitable for his investigation? A 1,2 and 3 B l and3only C 2 and 3only D 2 only 4 Which substance should be pure for the intended use? A a drug for curing diseases B aluminium for making airplane bodies C petrol for car fuels D tap water for human consumption arr metal tongs crucible tripod ttr I heat PartnerlnLeaming 100 magnesium

BP- r 03 5 P and Q are all samples of colourless alcohols. A paper chromatogram is obtained for samples of P and Q Which row is correct? PartnerlnLeaming 101 PQ statement 1 statement 2 A B c D A locating agent was used A locating agent was used. No locating agent was used. No locating agent was used. P may be a pure substance. P must be a pure substance. Q contains a substance that is least soluble in the solvent used. Q contains a substance that is most soluble in the solvent used.

BP- l04 6 Substance Y is added to an excess of hot water. A blue solution forms and a brown solid remains. The brown solid is filtered off and dried. The brown solid conducts electricity. Which statement about the substance Y, the blue solution, or the brown solid is inconect? A Substance Y may be a mixture which contains a metal. B Substance Y may contain coppe(Il) carbonate. C The blue solution must be an impure substance. D The brown solid may be an impure substance. 7 P is a white powdery solid. When a small spatula of P was added to a boiling tube filled with distilled water, P dissolved to form a blue solution. The blue solution was divided into two separate testtubes. ln the first test-tube, a blue precipitate was formed on dropwise addition of aqueous ammonia which dissolved in excess to form a deep-blue solution. ln the second test-tube, a white precipitate was formed on addition of an equal volume of acidified aqueous barium nitrate. The mixture was filtered and the filtrate crystallised to obtain solid O. What is P and Q? P o A B c D barium sulfate barium sulfate coppe(tr) sulfate coppe(tr) sulfate barium sulfate copper(Il) nitrate barium sulfate coppe(U) nitrate PartnerlnLeaming 102

BP-105 I 25.0 cm3 of aqueous silver nitrate was added to 25.0 cm3 of aqueous zinc nitrate to form mixture L. Mixture L was then added to '150 crn3 of 0.05 mol/dm3 sodium iodide in a beaker. 1 . 1 I g of precipitate was formed . What is the concentration of silver nitrate present in mixture L? A 0.065 mol/dm3 B 0.100 mol/dm3 C 0.150 mol/dm3 D 0.200 mol/dm3 9 Which diagram shows the anangement of the outermost electrons in calcium fluoride? A B c D a aX Ca2- PartnerlnLearning 103 * F FF* I I\ F- t, oF-

BP- 106 10 Part of the giant laftice structure of an ionic compound is shown. a cation Q anion The structure repeats to make a giant laftice. Which statement is incorrect? A The ions are held by strong electrostatic forces of attraction. B The lattice structure is broken down when this ionic compound dissolves in water c There are three anions directly surrounding each cation in the giant lattice. D This lattice structure could resemble that of calcium oxide. 1l Which statement about the structure or bonding of metals is mnect? A A metal lattice consists of negative ions in a 'sea of electrons'. B Electrons in a metal move randomly through the lattice. C Metals are malleable because the ions present are mobile. D The ions in a metal move when positive and negative electrodes are aftached. l2 The apparatus shown is set up to plate a steel key with copper. f-- a steel key impure copper aqueous silver nitrate The steel key does not get plated with copper. What is the minimum number of changes that needs to be made to plate the key with copper? Al82c3D4 PartnerlnLeaming '104 I I I i

8P"107 {3 The diagram shows the electrolysis of concentrated hydrochloric acid and concentrated aqueous sodium chloride using carbon electrodes. carbon carbon carbon carbon concentrated hydrochloric acid concentrated aqueous sodium chloride Which is a similarity between the two electrolysis experiments? A A gas which extjnguishes a lighted splint with a 'pop'sound is produced at the negative electrode. B A gas which relights a glowing splint is produced at the positive electrode. C A gas which turns damp red litmus paper blue and then bleaches it is produced at the positive electrode. D Electrons flow from the negative terminal of the battery towards the negative electrode, electrolyte, positive electrode and back to the positive terminal of the battery. 14 A simple cell can be made using two different metals as the electrodes and an aqueous solution as the electrolyte. Which statements about simple cells are coned? 1 A greater voltage is produced using magnesium and silver than using magnesium and copper. 2 Ethanol can be used as the electrolyte. 3 The more reactive metal will release elecfons. 4 An anion ah^rays gets discharged atthe negative electrode. A 2 only B l and3only C 1,3and4only D 1,2,3and4 PartneinLeaming 105 l--------r I

BP" 108 15 The reaction between hydrogen and iodine to form hydrogen iodide is exothermic. Which statement explains why the reaction is exothermic? A More bonds are formed than broken. B The activation energy is less than the energy released when bonds are formed. c The bond energies of the reactants are greater than the bond energies of the products. D The products are at a higher energy level than the reactants. 16 Lumps of coppe(ll) carbonate was added to 100 cm3 of 1.00 mol/dm3 dilute sutfuric acid which is in excess. CuCOs + HzSOr - CuSOr + HzO + COz The rate of the reaction and total volume of gas produced can be changed by varying the conditions. Which changes always increase both the rate of the reaction and the t