MSHS Chem Prelim P2

Class/ Index Number / Centre Number/ ‘O’ Level Index Number / Name MARIS STELLA HIGH SCHOOL PRELIMINARY EXAMINATION SECONDARY FOUR CHEMISTRY 6092/02 Paper 2 22 August 2025 1 hour 45 minutes Candidates answer on the Question Paper. No additional materials are required. READ THESE INSTRUCTIONS FIRST Write your class, index number, Centre number, O level index number and name in the spaces at the top of this page. 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 22. The use of an approved scientific calculator is expected, where appropriate. For Examiner’s Use Section A Section B Total This document consists of 22 printed pages. 70 10 80

2 Section A Answer all questions in this section in the spaces provided. 1 The structures of some carbon-containing substances, A, B, C, D, E and F are shown in Fig 1.1. Fig. 1.1 (a) Use the letters A, B, C, D, E and F to answer the following questions. Each letter may be used once, more than once or not at all. (i) Which substance is a saturated hydrocarbon? ……………………………………………………………………………………………...[1] (ii) Which substance has a giant molecular structure? ……………………………………………………………………………………………...[1] (iii) Which substance is a product of respiration? ……………………………………………………………………………………………...[1] (iv) Which substance is in the same homologous series as ethene? ……………………………………………………………………………………………...[1] (v) Which substance is found in limestone? ……………………………………………………………………………………………...[1] A B C D E F

3 (b) Explain why substance B in the atmosphere is increasing and why planting more trees is not a long-term solution to the increase in the amount of B. ……………………………………………………………………………………………................ ……………………………………………………………………………………………................. …………………………………………………………………………………………….............[2] [Total: 7]

4 2 Lithium is a metal and lithium chloride is a compound. The structure and properties of these substances are very different. (a) Explain using ideas about bonding and structure , how the particles in lithium and lithium chloride are held together. ……………………………………………………………………………………………........ ……………………………………………………………………………………………........ ……………………………………………………………………………………………........ ……………………………………………………………………………………………....[2] (b) Table 2.1 below shows the melting and boiling points of lithium and lithium chloride. Table 2.1 melting point / oC boiling point / oC lithium 180.5 1342 lithium chloride 605