SJI 2022 Y4 Prelim Chemistry 6092 P1 QP

1 ST JOSEPH’S INSTITUTION PRELIMINARY EXAMINATION 2022 (YEAR 4) CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY Paper 1 Additional Materials: Multiple Choice Answer Sheet 6092/01 31 August 2022 1 hour (08:00 – 09:00) READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, index number and class on the Answer Sheet 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 in this Question paper. A copy of the Periodic Table is printed on page 2 of this question paper. The use of an approved scientific calculator is expected, where appropriate. This document consists of 18 printed pages including this cover page.

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3 1 Two gases, ammonia and hydrogen chloride, are allowed to enter the apparatus as shown below. After some time, a white solid is formed on the inside of the tube. Which statements explain why a white solid is formed in the position shown? 1 Ammonia and hydrogen chloride react to form solid ammonium chloride. 2 Ammonia diffuses faster than hydrogen chloride. 3 Ammonia has a higher relative molecular mass than hydrogen chloride. A 1 only B 1 and 2 only C 2 and 3 only D 1, 2 and 3 2 The gas jar contain s compound W which is present in the solid, liquid and gaseous states. Which of the following statements is correct? A A gaseous W molecule has a lower mass than a liquid W molecule. B Liquid W molecules move slower than solid W molecules. C When W changes from gas to liquid, energy is absorbed. D When W changes from liquid to solid, energy is released. HCl(g) NH3(g) white solid stopper gas W liquid W solid W

4 3 A student plans two experiments. Experiment 1 : To find the concentration of aqueous sodium hydroxide by titration with dilute hydrochloric acid Experiment 2: To find the rate of the reaction between calcium carbonate and dilute hydrochloric acid by measuring the volume of gas given off every minute What are the other apparatus needed in addition to a conical flask? experiment 1 experiment 2 A burette, pipette electronic balance, measuring cylinder, thermometer B burette, pipette measuring cylinder, gas syringe, stopwatch C electronic balance, measuring cylinder, thermometer measuring cylinder, gas syringe, stopwatch D measuring cylinder, gas syringe, stopwatch burette, pipette 4 A sample of Y was analysed and found to contain only two isotopes, Y-63 and Y-65. The graph below shows the relative abundances of the two isotopes. What is the relative atomic mass of Y? A 63.2 B 63.4 C 63.6 D 64.0 relative abundance mass/charge ratio 70 30 63 65

5 5 Silicon carbide has the following structure shown below. Which statement is true for silicon carbide? A It has a high boiling po int because of the strong intermolecular forces of attraction. B It has a high melting point because it has a giant ionic lattice structure. C It is a hard solid because its atoms are bonded in a giant network. D It is a soft solid because the layers of atoms can slide over one another. 6 The physical properties of substances X, Y and Z are shown below. substance X Y Z melting point / °C 801 2852 3550 boiling point / °C 1413 3600 4827 electrical conductivity of solid poor poor good What could be the identities of X, Y and Z? X Y Z A MgO NaCl C (graphite) B MgO NaCl SiO2 C NaCl MgO C (graphite) D NaCl MgO SiO2

6 7 Ethene is a colourless gas while polyethene is a solid at room temperature and pressure. Which statement best explains this observation? A The covalent bo nds in ethene are stronger than the covalent bond s in polyethene. B The covalent bonds in polyethene are stronger than the covalent bond s in ethene. C The intermolecular forces of attraction in polyethene are stronger than the intermolecular forces of attraction in ethene. D The inte rmolecular forces of attraction in polyethene are weaker than the intermolecular forces of attraction in ethene. 8 The elements X, Y and Z form the covalent compound with the structural formula shown below. X – Y ≡ Z Which of the following shows the possible electronic configurations of the atoms of X, Y and Z? X Y Z A 1 2, 2 2, 5 B 1 2, 4 2, 3 C 2, 8, 7 2, 2 2, 3 D 2, 8, 7 2, 4 2, 5 9 Four oxides are added separately to aqueous sodium hydroxide. 1 aluminium oxide 2 carbon dioxide 3 copper(II) oxide 4 magnesium oxide Which oxides react with aqueous sodium hydroxide? A 2 only B 1 and 2 only C 3 and 4 only D 1, 3 and 4 only

7 10 The pH of an aqueous solution of hydrochloric acid is 2. What will be the pH of the acid after the addition of 10 g of sodium chloride? A 1 B 2 C 7 D 9 11 Which pair of substances can be used to prepare a sample of lead(II) chloride when added to water and mixed? A lead and hydrochloric acid B lead(II) carbonate and hydrochloric acid C lead(II) nitrate and potassium chloride D lead(II) sulfate and potassium chloride 12 Which method is most suitable for the laboratory preparation of copper(II) chloride? A react copper with chlorine gas B react copper(II) carbonate with excess dilute hydrochloric acid C react excess copper with concentrated hydrochloric acid D react excess copper(II) oxide with dilute hydrochloric acid 13 Excess aqueous silver nitrate is added to aqueous barium chloride, and the precipitate formed is removed by filtration. What are the possible ions present in the filtrate? A Ag+ and NO3- B Ba2+ and NO3- C Ag+, Ba2+ and NO3- D Ba2+, Cl- and NO3-

8 14 The diagram below shows a simplified diagram of the Haber Process. P, Q, R and S refer to the different substances present in different parts of the Haber Process. Some statements about P, Q, R and S are shown. 1 P is obtained from the fractional distillation of liquid air. 2 Q is formed under reaction conditions of 450 °C and 250 atm. 3 R is an essential element used to make fertilisers. 4 S is a mixture of two compounds. Which of the above statements are true? A 2 only B 2 and 3 only C 1, 3 and 4 only D 2, 3 and 4 only 15 The table below shows the concentration of polluting gases in four different industrial cities in parts of pollutant per billion parts of air (ppb). city concentration of ozone / ppb concentration of sulfur dioxide / ppb concentration of nitrogen dioxide / ppb W 11 38 40 X 21 45 14 Y 23 17 46 Z 30 32 33 In which city are limestone buildings under the greatest threat from pollution? A W B X C Y D Z N2 P R reaction chamber Q condenser compressor re-circulation pump S

9 16 Which of the following changes does not take place in a catalytic converter? A carbon monoxide → carbon dioxide B oxides of nitrogen → nitrogen C oxides of nitrogen → nitrogen monoxide D unburnt hydrocarbons → carbon dioxide and water 17 Tobacco is a harmful substance which is found in cigar ettes. The active component in tobacco is nicotine, which is dangerous and highly addictive. Analysis of a sample of nicotine showed that it contains