2022 EFSS Chem Prelims P2

EDG/PRELIM22/CHEM/6092/02/4EXP/BN [Turn over Class: Candidate Name: Candidate Index Number: EDGEFIELD SECONDARY SCHOOL 2022 PRELIMINARY EXAMINATION Secondary 4 O Syllabus CHEMISTRY Paper 2 Theory Candidates answer on the Question Paper. No Additional Materials are required. 6092/02 August 2022 1 hour 45 minutes READ THESE INSTRUCTIONS FIRST Write your class, name and class register number in the above boxes. Write in dark blue or black pen. You may use a HB 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. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. A copy of the Periodic Table is printed on page 22. The use of an approved scientific calculator is expected, where appropriate. FOR EXAMINER’S USE My target grade/mark: _________ Section A / 50 Section B / 30 TOTAL / 80 Parent’s signature This document consists of 22 printed pages.

EDG/PRELIM22/CHEM/6092/02/4EXP/BN 2 Section A Answer all questions in this section in the spaces provided. The total mark for this section is 50. A1 Choose from the following equations to answer the questions below. A CO32−(aq) + 2H+(aq) → CO2(g) + H2O(l) B Cu(s) → Cu2+(aq) + 2e− C Cu2+(aq) + 2e− → Cu(s) D Cu2+(aq) + 2OH−(aq) → Cu(OH)2(s) E Fe(s) + 2H+(aq) → Fe2+(aq) + H2(g) F H+(aq) + OH−(aq) → H2O(l) G 2I−(aq) + Br2(aq) → I2(aq) + 2Br−(aq) H NH4+(aq) + OH−(aq) → H2O(l) + NH3(g) I 4OH−(aq) → O2(g) + 2H2O(l) + 4e− Each equation can be used once, more than once or not at all. Give the letter of an equation which (a) shows the formation of gas that forms a white precipitate with limewater, ………………………………………………………………………………..… [1] (b) shows a reaction that forms a blue precipitate, ………………………………………………………………………………..… [1] (c) shows only oxidation, ………………………………………………………………………………..… [1] (d) shows the neutralisation of hydrochloric acid by sodium hydroxide, ………………………………………………………………………………..… [1] (e) shows the reaction at an inert positive electrode when copper(II) sulfate is electrolysed. ………………………………………………………………………………..… [1] [Total: 5]

EDG/PRELIM22/CHEM/6092/02/4EXP/BN [Turn over 3 A2 Seawater contains a variety of dissolved salts. (a) The diagram shows a simple distillation apparatus that can be used to produce purified water from seawater. Explain how distillation purifies seawater. ……………………………………………………………………………………... ……………………………………………………………………………………... ……………………………………………………………………………………... ……………………………………………………………………………………... ……………………………………………………………………………….… [3] (b) Magnesium chlo