2022 GYSS Chem Prelims P1

2 Y Additional Materials: Multiple Choice Answer Sheet Periodic Table READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, centre number, index number, class and register number in the spaces above. There are forty questions on this paper. Answer all questions. For each question there are four possible answers, A, B, C and D. Read the instructions on the Answer Sheet 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. The use of an approved scientific calculator is expected, where appropriate. This question paper consists of 16 printed pages, inclusive of this cover page / GUANGYANG SECONDARY SCHOOL PRELIMINARY EXAMINATION 2022 Secondary Four Express CANDIDATE NAME CENTRE NUMBER CLASS/ REG No. 6092/01 31 August 2022 1 hour CHEMISTRY Paper 1 Multiple Choice INDEX NUMBER ���

3 PAPER 1 (40 MARKS) This paper consists of 40 multiple-choice questions. For each question, there are four possible answers. Choose the best answer you consider correct and record your answer on the Answer Sheet provided. 1 Copper (II) nitrate is soluble in water. Copper (II) carbonate is insoluble in water. A mixture of solid copper (II) nitrate and copper(II) carbonate is added to a beaker of water. It is stirred until no more solid dissolves. How can separate samples of copper (II) nitrate and copper (II) carbonate be obtained from the resulting mixture? A B C D crystallisation followed by distillation evaporation followed by distillation evaporation followed by filtration filtration followed by crystallisation 2 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 B C D 1 and 3 1 and 4 2 and 3 2 and 4 3 It is possible to produce Ar2+ ions from argon atoms in a laboratory. Which statement is correct? A B C D Each argon atom gains two electrons and loses the electronic configuration of an inert gas. Each argon atom gains two electrons and obtains the electronic configuration of an inert gas. Each argon atom loses two electrons and loses the electronic configuration of an inert gas. Each argon atom loses two electrons and obtains the electronic configuration of an inert gas. 4 Two isotopes of chlorine are 35Cl and 37Cl. Using these isotopes, how many different relative molecular masses are possible for the compound with molecular formula C2H3Cl 3? A B C D 2 3 4 5 ���

4 5 The diagram below shows a fractionating column used in the separation of petroleum. Which row explains why fraction R is collected above fraction S? boiling point of R average molecular mass of R A greater than S greater than S B greater than S smaller than S C smaller than S greater than S D smaller than S smaller than S 6 The table shows data for some particles. There are gaps represented by W, X, Y and Z. Which row shows the correct values for W, X, Y and Z? ���

5 7 The energy profile diagram of a chemical reaction is shown below. Which statement is correct? A B C D The reaction is exothermic. Y represents H for the reaction. X represents the activation energy for the reaction. Z represents the energy given out as the reaction proceeds. 8 Three statements about the elements carbon, nitrogen and sulfur are shown below. 1 They are in groups next to each other in the Periodic Table. 2 Their neutron to proton ratios are all two to one. 3 They each form an acidic oxide. Which statements are correct? A B C D 1, 2 and 3 1 and 2 only 1 and 3 only 2 and 3 only 9 When K2MnO4 is dissolved in water, the following reaction occurs. aMnO42–(aq) + bH2O(l) → cMnO4–(aq) + d MnO2(s) + eOH–(aq) What could be the values of a and c in the balanced chemical equation? ���

6 10 Many elements and compounds contain covalent bonds. Which statement about covalently bonded elements and compounds is correct? A B C D Aqueous solutions of covalent compounds always conduct electricity. Bonding in the nitrogen molecule involves three shared pairs of electrons. Double covalent bonds are present in ethene and in water. The formation of covalent bonds always produces atoms with eight electrons in their outer shells. 11 J is an aqueous solution. On addition of aqueous sodium hydroxide to J a green precipitate is formed. The resulting mixture is heated and no gas is formed. Aluminium foil is added to the warmed mixture. A gas is formed that turns damp red litmus paper blue. Which ions could be present in J? A B C D Fe3+ and NH4+ Fe3+ and NO3- Fe2+ and NH4+ Fe2+ and NO3- 12 An aqueous solution of zinc chloride is tested by adding reagents. Which observation is correct? reagent added to zinc chloride (aq) observations A B C D acidified aqueous barium nitrate aqueous ammonia aqueous sodium hydroxide powdered copper forms a white precipitate forms a white precipitate, soluble in excess of the reagent forms a white precipitate, insoluble in excess of the reagent forms a grey precipitate 13 Which reaction is a redox reaction? A B C D Mg + 2HCl → MgCl2 + H2 MgCO3 + 2HCl → MgCl2 + H2O + CO2 MgO + 2HCl → MgCl2 + H2O Mg(OH)2 + 2HCl → MgCl2 + 2H2O 14 One mole of an organic compound, Q, is completely burnt in oxygen and produces exactly three moles of water. Which compound is Q? A B C D butane, C4H10 ethanol, C2H5OH propane, C3H8 propanol, C3H7OH ���

7 15 The diagram below shows the structure of an alloy. Which statement about alloys is correct? A B C D The alloy brass has a chemical formula. High carbon steel alloys are soft and easily shaped. Alloys can only be formed by mixing copper or iron with other metals. In an alloy there is attraction between positive ions and a ‘sea of electrons’. 16 Calcium carbonate, CaCO3, reacts with an acid, HA as shown below. CaCO3(s) + 2HA(aq) → CaA2(aq) + H2O(l) + CO2(g) What is the minimum mass of acid required to react completely with 10 g of calcium carbonate? [Mr: HA, 46; CaCO3, 100] A B C D 4.6 g 9.2 g 10 g 20 g 17 When concentrated sulfuric acid reacts with sodium iodide the products include sulfur, iodine, hydrogen sulfide and sulfur dioxide. Which statement is correct? A B C D Hydrogen sulfide is the product of a reduction reaction. Iodide ions are stronger oxidising agents than sulfate ions. Sulfur atoms from the sulfuric acid are both oxidised and reduced. Sulfur atoms from the sulfuric acid are oxidised to make sulfur dioxide. 18 Attaching pieces of magnesium to underground iron pipes can protect the iron from corrosion. Which reaction protects the iron from corrosion? A B C D Fe2+ (aq) + 2e– → Fe (s) Fe (s) → Fe2+ (aq) + 2e– Mg2+ (aq) + 2e– → Mg (s) Mg (s) → Mg2+ (aq) + 2e– ���

8 19 The names and formulae of three nitrogen compounds are shown below. ammonia