2022 VS Chem Prelims P2

Class Register Number Name 6092/02 CHEMISTRY 22/4P/6092/2 PAPER 2 Tuesday 30 August 2022 1 hour 45 minutes VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA SCHOOL VICTORIA VICTORIA SCHOOL PRELIMINARY EXAMINATION SECONDARY FOUR READ THESE INSTRUCTIONS FIRST Write your name, class and index number on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Section A Answer all questions in the spaces provided. Section B Answer all three questions. The last question is in the form either/or. Answer all questions in the spaces provided. The number of marks is given in brackets [ ] at the end of each question or part question. The use of an approved scientific calculator is expected, where appropriate. A copy of the Periodic Table is printed on page 22. This question paper consists of 22 printed pages, including the cover page. [Turn Over Section A / 50 Section B / 30 Total / 80 Deductions Presentation Significant Figures Units

2 © Victoria School 22/4P/6092/2 Section A Answer all the questions in this section in the spaces provided. The total mark for this section is 50. A1 Select substances from the list to answer the following questions. You may use each substance once, more than once or not at all. CaCl2 C CO2 Cu(NO3)2 Na3PO4 SO2 ZnSO4 (a) Which substance is an acidic atmospheric pollutant from volcanic eruptions? …………………………………………...………………………………………………..[ 1] (b) Which substance is commonly used as an inert electrode? …………………………………………...………………………………………………..[ 1] (c) Which substance dissolves in water to form an aqueous solution that gives a n insoluble white precipitate on addition of excess aqueous sodium hydroxide? …………………………………………...………………………………………………..[ 1] (d) Which substance is likely to be a good catalyst? …………………………………………...………………………………………………..[ 1] (e) Which substance will decolourise when used as an electrolyte in an electrolytic cell with inert electrodes? …………………………………………...………………………………………………..[ 1] [Total: 5]

3 © Victoria School 22/4P/6092/2 A2 The nuclide notation of hydrogen and deuterium are shown. (a) Suggest a term to indicate the relationship between a hydrogen atom and a deuterium atom. …………………………………………...………………………………………………..[ 1] (b) Deuterium reacts with oxygen in the same way as hydrogen. The product of the reaction is known as 'heavy water'. (i) Using the chemical symbols given above, write the chemical equation for the reaction between deuterium and oxygen. ……..............................................................................................................[1] (ii) Explain why deuterium reacts with oxygen in the same way as hydrogen. ……..............................................................................................................[1] (iii) Sodium can react with water in the following chemical equation. 2H2O + 2Na → 2NaOH + H2 7.2 g of water and 6.9 g of sodium are allowed to react. Determine the limiting reactant and c alculate the volume of hydrogen produced. [3] [Total: 6] H 1 1 D 2 1 hydrogen deuterium

4 © Victoria School 22/4P/6092/2 A3 Table 3.1 shows the melting and boiling points of some substances. substance melting point / °C boiling point / °C lead(II) bromide 370 914 lithium 180 1360 methane –182 –161 methanimine –93 –6 X 1610 2230 (a) Explain, using ideas about structure and bonding, why methane and lithium have different boiling points. ………………………………………………………………………………………………... ………………………………………………………………………………………………... ………………………………………………………………………………………………... …………………………………………...………………………………………………..[ 2] (b) A sample of lead(II) bromid e was mixed with chlorine gas in a reaction vessel . However, there was no observable change. Explain why there was no change observed. ………………………………………………………………………………………………... …………………………………………...………………………………………………..[ 1] (c) Substance X is a very hard substance that is commonly used on the tips of drill bits. (i) Suggest the identity of substance X. ……..............................................................................................................[1] (ii) Explain why the substance has poor electrical conductivity. ………...……………………………………………………………………………... ……..............................................................................................................[1] Table 3.1

5 © Victoria School 22/4P/6092/2 (d) Methanimine has the molecular formula, CH3N. Draw a ‘dot-and-cross’ diagram of methanimine. Show outer electrons only. [2] [Total: 7]

6 © Victoria School 22/4P/6092/2 A4 Table 4.1 shows part of a revised version of the original Periodic Table first published by Mendeleev in 1869. (a) Which group of elements in the modern Periodic Table is missing from the Mendeleev Periodic Table? …………………………………………...………………………………………………..[ 1] (b) Identify two other differences between Mendeleev’s Periodic Table and the modern Periodic Table. 1. ……………………………………………………………………………………………... ………………………………………………………………………………………………... 2. ……………………………………………………………………………………………... …………………………………………...………………………………………………..[ 2] (c) Some elements were left out of the Periodic Table as they had not been discovered. Fill in the chemical symbol of germanium in Table 4.1. [1] Period 1 Period 2 Period 3 Period 4 Period 5 Group I H Li Na K Cu Rb Ag Group II Be Mg Ca Zn Sr Cd Group III B Al Y In Group IV C Si Ti Zr Sn Group V N P V As Nb Sb Group VI O S Cr Se Mo Te Group VII F Cl Mn Br I Table 4.1

7 © Victoria School 22/4P/6092/2 (d) Mendeleev put elements with similar properties in the same Group. One of the properties he used was the formula of the oxides of the elements. Table 4.2 shows the different types of oxides formed when Group I metals tarnish in air. element oxides formed formula lithium lithium oxide Li2O sodium sodium oxide Na2O sodium peroxide Na2O2 potassium potassium superoxide KO2 rubidium rubidium superoxide RbO2 (i) Do the formulae of the oxides given in the table show clearly that all of the elements belong in the same Group? Explain your answer. ………...……………………………………………………………………………... ……..............................................................................................................[1] (ii) Do the formulae of the oxides given in the table show a trend down the Group? Explain your answer. ………...……………………………………………………………………………... ……..............................................................................................................[1] (e) What are the formulae of the peroxide and superoxide ions? peroxide ion ……………………………………… superoxide ion …………………………………… [2] [Total: 8] Table 4.2

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