Dunman (2024) 4E 6092 Prelim P2

This document consists of 28 printed pages with 1 blank page. DUNMAN SECONDARY SCHOOL CANDIDATE NAME CLASS INDEX NUMBER PRELIMINARY EXAMINATION 2024 SECONDARY 4 EXPRESS CHEMISTRY 6092/02 Paper 2 22 August 2024 1 hour 45 minutes Candidates answer on the Question Paper. No Additional Materials are required. 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 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 28. The use of an approved scientific calculator is expected, where appropriate.

2 6092/02/Prelim/4Exp/2024 Section A Answer all questions. 1 These diagrams show the electron arrangement in the outer shells of five elements, A to E. All elements are from Period 2 of the Periodic Table. A B C D E Use the letters A to E to answer the following questions. You may use each letter once, more than once or not at all. (a) Which elements are most likely to be non-metals? …………….………………………………………………………………………….………...... [1] (b) Which element has an atomic number of 5? …………….………………………………………………………………………….………...... [1] (c) What element forms an ion with a charge of 2+? …………….………………………………………………………………………….………...... [1] (d) Which element will form three covalent bonds when it forms a compound? …………….………………………………………………………………………….………...... [1] (e) Which two elements will form a compound with the formula of the type YZ2? …………….………………………………………………………………………….………...... [1] [Total: 5]

3 6092/02/Prelim/4Exp/2024 2 Table 2.1 shows the formulae of some oxides of elements from period 3 of the Periodic Table. Table 2.1 Group 1 2 13 14 15 16 17 Na2O MgO Al2O3 SiO2 P2O5 SO2 Cl2O (a) From the table give one formula each for acidic oxide, basic oxide and amphoteric oxide. acidic oxide ………………………. basic oxide ………………………. amphoteric oxide ………………........... [2] (b) Draw a ‘dot-and-cross’ diagram to show the bonding in sulfur dioxide. Show outer electrons only. [2]

4 6092/02/Prelim/4Exp/2024 (c) Explain, in terms of structure and bonding, why the melting point of silicon dioxide is very much higher than that of sulfur dioxide. ………………………………………………………………………………………………………. ……………………………………………………………………………………………………….