2024 CHIJ Sec 4E Chemistry Prelim P2

O CONVENT OF THE HOLY INFANT JESUS SECONDARY Preliminary Examination in preparation for the General Certificate of Education Ordinary Level 2024 CANDIDATE NAME CLASS REGISTER NUMBER CHEMISTRY Paper 2 Candidates answer on the Question Paper. No Additional Materials are required. 6092/02 22 August 2024 1 hour 45 minutes READ THESE INSTRUCTIONS FIRST Write your name, class and register number on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Section A Answer all questions. Write your answers in the spaces provided. Section B Answer one question. Write your answers in the spaces provided. 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 24. The use of an approved scientific calculator is expected, where appropriate. This document consists of 22 printed pages and 2 blank pages. [Turn over

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3 CHIJSec/2024/OLevelPrelim/6092/02 [Turn over Section A Answer all questions. The total mark for this section is 70. 1 Some ionic equations, A to F, are shown. A H+ + OH– → H2O B Fe3+ + 3OH– → Fe(OH)3 C Cl2 + 2Br– → Br2 + 2Cl– D Na+ + e – → Na E 2Cl– → Cl2 + 2e – F NH4+ + OH– → H2O + NH3 Each letter may be used once, more than once or not at all. Give the letter, A to F, for the equation which represents (a) a displacement reaction. ………………….…….. [1] (b) a precipitation reaction. ………………….…….. [1] (c) a redox reaction. ………………….…….. [1] (d) a neutralisation reaction. ………………….…….. [1] (e) Give the letters of the two equations that, when combined, represent a decomposition reaction. ………………….……. and ………………….……. [1] [Total: 5]

4 CHIJSec/2024/OLevelPrelim/6092/02 2 Steel is an alloy of iron which contains carbon. There are many different types of steel that can be used for different purposes. Fig. 2.1 shows the arrangement of atoms in pure iron. Fig. 2.1 (a) In the diagram below, draw the arrangement of atoms in steel. You should complete the legend provided. [2] (b) Use your diagram and Fig. 2.1 to explain why (i) steel is a mixture of elements. …………..………………………………………………………………...……………......... …………..………………………………………………………………...…………….... [1] (ii) steel is harder than pure iron. …………..………………………………………………………………...……………......... …………..………………………………………………………………...……………......... …………..………………………………………………………………...…………….... [2] (c) Describe how the particles in steel allow it to conduct electricity. …………………………………………………….……….……………………………………….. ……………………………………………………………...………………………………..….. [1] Legend: iron carbon

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