2022 NSS Chem Prelims P1

This document consists of 19 printed pages including the cover page and 1 blank page. NAME: CLASS: INDEX NO: READ THESE INSTRUCTIONS FIRST NORTHLAND SECONDARY SCHOOL PRELIMINARY EXAMINATION Secondary Four Express CHEMISTRY 6092/01 Paper 1 Multiple Choice 31 August 2022 Additional Materials: Multiple Choice Answer Sheet 1 hour Setter: Mdm Kumari Vetter: Mdm Nilasari Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your class, index number and name on the Answer Sheet in the spaces provided unless this has been done for you. There are forty questions in this section. 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. 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 19. The use of an approved scientific calculator is expected, where appropriate. SECTION FOR EXAMINER’S USE TOTAL 40 ���

Learners who Share, Citizens who Care, Leaders who Dare 2 1 The diagram shows apparatus used to obtain a gas sample from a mixture of nitrogen, carbon monoxide, carbon dioxide and ammonia. Which gases would be present in the gas sample? A carbon monoxide and ammonia only B carbon monoxide and carbon dioxide only C nitrogen and ammonia only D nitrogen and carbon dioxide only 2 A student is given 750 cm3 of a saturated solution containing a sodium salt S and 550 cm3 of a saturated solution containing a potassium salt P. Both salts do not decompose on heating. Which apparatus must she use to enable her to determine which salt is more soluble? A 1, 4 and 6 B 1, 5 and 6 C 1, 2, 3 and 4 D 2, 4, 5 and 6 aqueous potassium manganate(VII) concentrated sulfuric acid water gas sample 1 2 3 4 5 6 ���

Learners who Share, Citizens who Care, Leaders who Dare 3 3 The graph shows the changes in temperature when a mixture containing equal volumes of X (boiling point 78 °C) and Y (boiling point 108 °C) is heated and separated by fractional distillation. temperature / oC time / min Which section(s) describe(s) the concentration of vapours X and Y correctly? section concentration of vapours 1 equal X and Y in the distilling flask 2 more X than Y in the condenser 3 more X than Y in the condenser A 2 only B 1 and 2 only C 2 and 3 only D 1, 2 and 3 3 1 2 1 ���

Learners who Share, Citizens who Care, Leaders who Dare 4 4 In a paper chromatography experiment involving some food colouring, two different solvents X and Y were used on separate samples of the colouring. The two chromatograms are shown. Which statement can be deduced from the results? A Dye Z is equally soluble in solvent X and solvent Y. B Dye Z is more soluble in solvent Y than solvent X. C The distance dye Z travels depends on the amount of colouring used. D The distance dye Z travels depends on the solvent used. 5 Four substances 1 to 4 can be represented by the diagrams. 1 2 3 4 A student described them as follows: Substance Description 1 Mixture of elements 2 Molecules of a compound 3 Molecules of an element 4 Mixture of elements and compounds Which substance(s) has/have been correctly described by the student? A 1 only B 4 only C 2 and 4 only D 1, 2 and 3 only start line solvent front dye Z dye Z Solvent X start line solvent front Solvent Y ���

Learners who Share, Citizens who Care, Leaders who Dare 5 6 Element J exists mostly as the isotope 51J, which makes up 77.8% of a sample of the element. The other known isotope is 54J. What is the relative atomic mass of element J? A 51.7 B 51.9 C 52.5 D 53.4 7 The structural diagrams of two molecules, X2Y and ZY2, are shown. X2Y ZY2 Which diagram represents a molecule of a compound formed between X and Z? A B C D 8 Which substance could be graphite? melting point / oC boiling point / oC Electrical conductivity when solid A -52 -2 poor B 98 883 good C 648 1294 poor D 3652 4827 good ���

Learners who Share, Citizens who Care, Leaders who Dare 6 9 The table gives the proton and nucleon numbers of atoms P, Q, R and S. Which statement is true? atom proton number nucleon number P 6 14 Q 7 14 R 16 32 S 20 40 A Atom P and atom Q are isotopes of the same element. B Atom P and atom R will combine to form a covalent compound. C Atom Q and atom S will form an ionic compound with the formula S2Q3. D Atom S can form a diatomic molecule. 10 The diagrams show the structures of diamond and graphene, made up of carbon atoms in different arrangements diamond graphene Which row shows the correct properties of diamond and graphene? diamond graphene A good electrical conductor poor electrical conductor B poor electrical conductor poor electrical conductor C high melting point high melting point D low melting point high melting point 11 Chlorobutane, C4H9Cl, can be made from butanol using the reaction shown. C4H9OH + HCl C4H9Cl + H2O In an experiment, 20 g of butanol produced 24 g of chlorobutane. What is the percentage yield of chlorobutane? [Mr of C4H9OH: 74; Mr of C4H9Cl: 92.5] A 19.5 % B 48.0 % C 55.3 % D 96.0 % ���

Learners who Share, Citizens who Care, Leaders who Dare 7 12 x cm3 of gaseous hydrogen chloride, measured at room temperature and pressure, was dissolved in water to make 200 cm 3 of hydrochloric acid. 20.0 cm 3 of the hydrochloric acid prepared required 30.0 cm 3 of 0.1 mol/dm 3 sodium hydroxide for complete neutralisation. What is the value of x? A 0.110 cm3 B 1.10 cm3 C 72.0 cm3 D 720 cm3 13 Tin is extracted from its ore, SnO2, by reducing it with carbon in a furnace. The equation for the reaction is shown. SnO2 + 2C → Sn + 2CO2 What is the percentage purity of tin ore if 600 g of the tin ore is reduced to produce 82 g of tin? [Ar of Sn: 119, Mr of SnO2: 151] A 82 119 × 151 600 × 100 B 82 119 × 600 151 × 100 C 119 82 × 151 600 × 100 D 119 82 × 600 151 × 100 ���

Learners who Share, Citizens who Care, Leaders who Dare 8 14 The diagram shows an electrolysis experiment using inert electrodes. Which row indicates the concentration of the electrolytes in X and Y after some time? X Y A changes changes B changes unchanged C unchanged changes D unchanged unchanged 15 The diagram shows a simple cell. Which half-equations best represent the reactions occurring at the positive and the negative electrode? negative electrode positive electrode A Fe Fe2+ + 2e- Pb2+ + 2e- Pb B Fe Fe2+ + 2e- 2H+ + 2e- H2 C 2H+ + 2e- H2 Fe Fe2+ +