PRSS 4E Chemistry Prelim 2023 P2

Name Class Register No. SECONDARY 4 EXPRESS PRELIMINARY EXAMINATION 2023 CHEMISTRY Paper 2 Friday 1035 – 1220 6092/02 18 Aug 2023 1 h 45 min Candidates answer on the Question Paper. No Additional Materials are required. 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 a soft 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. This document consists of 22 printed pages, including the cover page. Setter: Ms Chua Wei Tian [Turn over Pasir Ris Secondary School For Examiner’s Use Section A B9 B10 B11 Total

PRSS_2023_S4E_PRELIM_CHEM_ 6092_P2 2 Section A Answer all the questions in the spaces provided. The total mark for this section is 50. A1 Fig. 1.1 shows the electronic configurations of five elements, A, B, C, D and E. Fig. 1.1 (a) Use the letters A, B, C, D and E to answer the following questions. Each letter may be used once, more than once or not at all. (i) Which element is most likely to be a metal with low melting point? ……………………………………………………………………………………………………….. [1] (ii) Which element can be oxidised by oxygen to form an amphoteric oxide? ……………………………………………………………………………………………………….. [1] (iii) Which element can form a molecule with a double covalent bond? ……………………………………………………………………………………………………….. [1] (b) Element E exists as a single atom only. Explain why. …………………………………………………………………………………………………………………... …………………………………………………………………………………………………….………… [1] [Total: 4]

PRSS_2023_S4E_PRELIM_CHEM_ 6092_P2 3 A2 Table 2.1 shows the formulae of oxides of elements across Period 2 and Period 3 in the Periodic Table. Table 2.1 Period Group I II III IV V VI VII 2 Li2O BeO B2O3 CO2 NO2 - F2O 3 Na2O MgO Al2O3 SiO2 P2O5 SO2 Cl2O (a) Carbon and sili con are elements in Group IV of the Periodic Table. They form oxides with very different melting points. Explain, in terms of structure and bondi ng, why the melting points of carbon dioxide and silic on dioxide are different. …………………………………………………………………………………………………………………... …………………………………………………………………………………………………………………... …………………………………………………………………………………………………………………... …………………………………………………………………………………………………………………... …………………………………………………………………………………………………….………… [3] (b) (i) Draw a ‘dot-and-cro