2022 JSS Chem Prelims P1

O JURONG SECONDARY SCHOOL 2022 GRADUATION EXAMINATION 2 SECONDARY 4 EXPRESS CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY 6092/01 PAPER 1 29 August 2022 1 hour Additional Materials: Multiple Choice Answer Sheet. READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and index number on the Answer Sheet in the spaces provided unless this has been done for you. 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 to be found on page 19. The use of an approved scientific calculator is expected, where appropriate. For Examiner’s Use TOTAL [40 marks] This document consists of 19 printed pages including this page. [Turn over] ���

6092/01/GE2/22 [Turn over] 2 1 An experiment is designed to collect a dry sample of carbon dioxide produced when an excess dilute acid is added to 0.35 g of calcium carbonate. Which apparatus set-up is most suitable for this experiment? A B C D ���

6092/01/GE2/22 [Turn over] 3 2 The melting and boiling points of some substances are given in the table. Which substance may be condensed using a water-cooled condenser? substance melting point / ºC boiling point / ºC A ammonia –78 –33 B ethylamine –81 16.6 C methane –182.5 –162 D pentane –130 36 3 The following shows some common cations. 1 Ca2+ 2 Cu2+ 3 Fe3+ 4 Pb2+ Which cations will produce a precipitate when mixed with excess aqueous ammonia? A 1 and 2 only B 2 and 3 only C 3 and 4 only D all of the above 4 Which statement explains why carbon monoxide and ethene diffuse at the same rate? A They are both gases at room temperature. B They both contain the element carbon. C They both react with oxygen. D They have the same relative molecular mass. ���

6092/01/GE2/22 [Turn over] 4 5 Two naturally occurring isotopes of uranium can be represented as U92235 and U92238. Which statement is true? A U92238 has 92 electrons and 146 neutrons. B U92235 has 92 protons and 144 neutrons. C U92235 has the same number of neutrons as the U92238 atom. D U92235 has fewer electrons than the U92238 atom. 6 The diagram below shows a simplified structure for asbestos. What are the bonds present in asbestos? A covalent and ionic bonds B covalent and metallic bonds C covalent bonds and intermolecular forces of attraction D ionic bonds 7 The following shows some simple covalent compounds. 1 CO2 2 CH4 3 NH3 Which contains valence electrons that are not used for bonding? A 1 only B 1 and 2 C 1 and 3 D 3 only ���

6092/01/GE2/22 [Turn over] 5 8 Which statements about metals are correct? 1 Metals form only basic oxides. 2 Metals conduct thermal energy. 3 Metals are lustrous and ductile. A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3 9 5.0 g of an oxide of bismuth contains 4.48 g of bismuth. What is the molecular formula of this oxide? A BiO B Bi2O3 C Bi3O4 D Bi4O3 10 Which compound does not have the empirical formula CH2O? A ethanoic acid, CH3CO2H B ethanol, CH3CH2OH C glucose, C6H12O6 D methyl methanoate, HCO2CH3 11 Hydrogen reacts with oxygen to form steam according to the equation below. 2H2(g) + O2(g) → 2H2O(g) Which statement is correct? A 1 mol of steam is formed if 1 mol of oxygen reacts completely in excess hydrogen. B 4 g of hydrogen completely reacts with 16 g of oxygen. C 16 g of oxygen would produce 18 g of steam. D 36 g of steam is formed if 2 g of hydrogen reacts completely in excess oxygen. ���

6092/01/GE2/22 [Turn over] 6 12 The formula of a metal carbonate is M2CO3. 0.69 g of the carbonate requires 50 cm3 of 0.20 mol/dm3 hydrochloric acid for complete reaction. The equation for the reaction is shown. M2CO3 + 2HCl → 2MCl + CO2 + H2O What is the relative atomic mass of metal M? A 19 B 23 C 39 D 78 13 The list shows the electrolytes in three electrolytic cells with inert electrodes. 1 aqueous sodium chloride solution 2 concentrated sodium chloride solution 3 concentrated hydrochloric acid 4 dilute hydrochloric acid In which cells will chlorine gas be first produced? A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4 ���

6092/01/GE2/22 [Turn over] 7 14 Methane burns in oxygen to form carbon dioxide and water. The following energy level diagram represents this reaction. Which row correctly identifies the energy involved in respective bond breaking and bond forming processes? energy involved in bond breaking only energy involved in bond forming only A ∆H1 ∆H2 B ∆H1 and ∆H3 ∆H2 C ∆H2 ∆H1 and ∆H3 D ∆H2 ∆H3 15 Zinc reacts with dilute hydrochloric acid at a constant temperature of 25 ºC. Which statement about the rate of this reaction is correct? A It decreases and the reaction stops within 2 seconds. B It decreases then increases as the reaction proceeds. C It increases at the start then decreases as the reaction proceeds. D It remains the same as the reaction proceeds. ���

6092/01/GE2/22 [Turn over] 8 16 Ilmenite is a mineral containing iron(II) titanate, FeTiO3. It is the main source of titanium dioxide which is used mainly in paints, sunscreens and cosmetics. The equation shows the reaction to obtain titanium dioxide from ilmenite. FeTiO3 + 2H+ → Fe2+ + TiO2 + H2O Which statement about this reaction is correct? A Ilmenite is the reducing agent in this reaction because it has been reduced. B The acid used in the reaction has been oxidised because it gained oxygen. C This is not a redox reaction. D Titanium in ilmenite has been reduced because it has gained electrons. 17 Aluminium, magnesium and sulfur are elements from Period 3 of the Periodic Table. Which row shows the nature of the oxides formed by these three elements? aluminium magnesium sulfur A amphoteric basic neutral B amphoteric basic acidic C basic amphoteric acidic D basic amphoteric neutral 18 When compound X is added to ammonium nitrate solution, a gas with a pungent smell is produced. The gas turns damp red litmus paper blue. What could compound X be? A potassium oxide B magnesium carbonate C sodium nitrate D zinc sulfate ���

6092/01/GE2/22 [Turn over] 9 19 The table shows the solubility of some mercury(I) salts. salt solubility in water HgCl Hg2CO3, Hg2SO4 HgNO3 very slightly soluble in water insoluble soluble Which is most suitable in making a sample of mercury(I) chloride? A Add dilute hydrochloric acid to aqueous mercury(I) nitrate and filter. B Add excess mercury(I) carbonate to cold dilute hydrochloric acid and filter. C Heat mercury(I) sulfate with dilute hydrochloric acid, cool and filter. D Heat liquid mercury with dilute hydrochloric acid, cool and filter. 20 The decomposition of sulfur trioxide to sulfur dioxide is a reversible reaction. 2SO3(g) ⇌ 2SO2(g) + O2(g) This reaction is endothermic in the forward direction and the heat absorbed is 196 kJ/mol. The activation energy for the forward reaction is 271 kJ/mol. What is the activation energy of the reverse reaction? A 75 kJ/mol B 121 kJ/mol C 196 kJ/mol D 271 kJ/mol 21 Element Y is in the second period of the Periodic Table. An atom of element Z has six more protons than an atom of element Y. Which statement must be correct? A Elements Y and Z are in the same period. B Elements Y and Z have the same number of electrons in the first shell. C Element Z has six more electrons in its outer shell than element Y. D The nuc