BTYSS 2024 FYE 4E CHEM P2

BEATTY SECONDARY SCHOOL PRELIMINARY EXAMINATION 2024 SECONDARY FOUR EXPRESS CANDIDATE NAME CLASS REGISTER NUMBER CHEMISTRY 6092/02 Paper 2 16 August 2024 Setter: Mdm Stella Soh 1 hour 45 minutes 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 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 A 70 B…. 10 Total 80 This document consists of 22 printed pages and 0 blank page. [Turn over

2 Section A Answer all questions in this section in the spaces provided. A1 The formulae of some elements and compounds are listed. I2 ZnCl2 BaCl2 PbO KI CuCO3 PbBr2 SO2 Answer the following questions using elements or compounds from the list. You may use each element or compound once, more than once or not at all. (a) Which substance can react with both an acid and an alkali? ………………………………………………………………………………………… [1] (b) Which substance in aqueous form reacts with aqueous chlorine to form a brown solution with black crystals? ………………………………………………………………………………………… [1] (c) Which substance has a mass of 8.00 g for every 0.125 mol? ………………………………………………………………………………………… [1] (d) Which substance can be prepared by precipitation? ………………………………………………………………………………………… [1] (e) Which substance produces a red dish brown vapour when electricity is passed through its molten state? ………………………………………………………………………………………… [1] [Total: 5]

3 A2 Chlorine exists as two isotopes, chlorine-35 and chlorine-37. (a) In a sample of 100 chlorine atoms, there are 76 atoms of chlorine-35 and 24 atoms of chlorine-37. Find the average relative atomic mass of this chlorine sample. average relative atomic mass = ………………………… [1] (b) An element T is found in period 3 of the Periodic Table. It reacts with chlorine to form a chloride with a formula T2Cl2, which has a melting point of −80C and a boiling point of 137C. (i) Use ideas about bonding and structure to explain why T2Cl2 is a liquid at room temperature and pressure. ………………………………………………………………………………………… ………………………………………………………………………………………… …………………………………………………………………………………. [2] (ii) Draw a ‘dot and cross’ diagram to show the arrangement of