2025 Christ Church Prelim P2 QP

CHR 2025/Chemistry 6092/02/O/CZY [Turn Over CHRIST CHURCH SECONDARY SCHOOL 2025 PRELIMINARY EXAMINATION SECONDARY FOUR EXPRESS CANDIDATE NAME CLASS / CENTRE NUMBER S INDEX NUMBER CHEMISTRY 6092/02 Paper 2 19 August 2025 1 hour 45 minutes Candidates answer on the Question Paper No additional materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number, index number, name and class on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams, graphs, or rough working. 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 questions. 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 21. The use of an approved scientific calculator is expected, where appropriate. ______________________________________________________________________ This document consists of 19 printed pages and 2 blank pages. For Examiner’s Use Section A Section B 10 11 Total 80

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3 Section A Answer all questions in the spaces provided. 1 A list of substances is provided below. methane copper(II) chloride sulfur dioxide sodium oxide lead(II) nitrate zinc sulfate (a) For the questions below, each substance can be used once, more than once or not at all. (i) Which substance exists as a simple molecule but can conduct electricity in aqueous state? .……………………………………………………………………………………… [1] (ii) Which substance, when dissolved in water, gives a blue precipitate with aqueous sodium hydroxide? .……………………………………………………………………………………… [1] (iii) Which substance contains an element with an oxidation state of +6? .……………………………………………………………………………………… [1] (iv) Which substance changes the colour of potassium manganate(VII) from purple to colourless? .……………………………………………………………………………………… [1] (b) Sodium oxide is a white solid that melts at 1132 oC. It dissolves in water to form an alkaline solution with effervescence. (i) Describe the arrangement and movement of the sodium oxide particles at 1140 oC. .……………………………………………………………………………………… .……………………………………………………………………………………… .……………………………………………………………………………………… [2] (ii) Write the chemical equation for the formation of this alkaline solution. .……………………………………………………………………………………… [1] (iii) State the observation you would expect when an