2020 SNGS Prelim P2

This document consists of 20 printed pages. [Turn over Name: _________________________ ( ) Class:_____________ PRELIMINARY EXAMINATION GENERAL CERTIFICATION OF EDUCATION ORDINARY LEVEL ______________________________________________________________ CHEMISTRY 6092/02 Paper 2 26 August 2020 1hour 45minutes ______________________________________________________________ READ THESE INSTRUCTIONS FIRST Write your name, register number, and class clearly in the spaces provided at the top of this page. Write in dark blue or black pen only. You may use a soft pencil for any diagrams or graphs. Do not use highlighters, glue, and correction fluid or correction tape. Section A Answer all questions in the spaces provided. Section B Answer all three questions, the last question is in the form of either/or. Answer all questions in the spaces provided. A copy of Periodic Table is provided on page 2. The number of marks is given in brackets [ ] at the end of each question or part question. The use of a scientific calculator is expected, where appropriate. Marks Section A (50) Section B (30) Total (80)

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3 Section A Answer all the questions in this section in the space provided. The total mark for this section is 50. A1 The following substances are given: aluminium lithium oxide water air zinc oxide ammonium chloride brass silver carbonate nitrogen monoxide Each substance may be used once, more than once or not at all. (a) (i) Which substance is a mixture of elements only? ……………………………………………………………………………………………..[1] (ii) Which substance contains a non-metallic element with an oxidation state of +2? ……………………………………………………………………………………………..[1] (iii) Which substance reacts with hot alkaline sodium nitrate to form an alkaline gas? ……………………………………………………………………………………………..[1] (iv) Which substance can be obtained by sublimation when mixed with sodium chloride? ……………………………………………………………………………………………..[1] (v) Which substance is best obtained by simple distillation when mixed with ammonium chloride? ……………………………………………………………………………………………..[1]

4 (b) Briefly describe how a sample of pure and dry silver carbonate can be produced in the laboratory. ……………………………………………………………………………………………................ ……………………………………………………………………………………………................ ……………………………………………………………………………………………................ ……………………………………………………………………………………………............[3] [Total: 8 marks] A2 Elements R and Q react with chlorine readily to form chl orides. The table below below shows some of the propertie