catholic high school chemistry paper 2 sect a prelim 2023

[Turn over Name: Index Number: Class: CATHOLIC HIGH SCHOOL Preliminary Examination Secondary 4 (O-Level Programme) CHEMISTRY 6092/02 Paper 2 22 August 2023 1 hour 45 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, index number and class 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 in the spaces provided. The number of marks is given in brackets [ ] at the end of each question or part question. The use of an approved scientific calculator is expected, where appropriate. For examiner’s use only: Section A / 50 This document consists of 12 printed pages. A

2 Section A Answer all questions in this section in the spaces provided. The total mark for this section is 50. A1 The table consists of four different experimental procedures. (a) Put a tick (✓) if a redox reaction had occurred. Put a tick (✓) if a redox reaction had occurred. (i) a copper strip added to lead(II) nitrate solution (ii) aqueous chlorine added to potassium iodide solution (iii) hydrogen gas passed over heated copper(II) oxide (iv) potassium nitrate solution warmed with sodium hydroxide solution [3] (b) A student repeated (a)(ii) by replacing aqueous chlorine with aqueous bromine. Describe a difference in the rates of the two reactions and explain your answer. ……………………………………………………………………..……………………………………. ……………………………………………………………………..……………………………………. ……………………………………………………………………..……………………………………. ……………………………………………………………………………………………………..… [2] [Total: 5]

3 [Turn over A2 The boiling points of ethane and some chlorine-containing organic compounds are given in Table 2.1. Table 2.1 formula of compound C2H6 C2H5Cl C2H4Cl2 C2H3Cl3 C2H2Cl4 boiling point / °C −89 12 84 114 147 (a) Describe the general trend shown by the data in Table 2.1. ……………………………………………………………………..……………………………………. ……………………………………………………………………………………………………..… [1] (b) Use the formulae of the compounds to answer the following questions. Each formula may be used once, more than once, or not at all. (i) Which compound is a hydrocarbon? ………………..……………………………………….……………………………………… [1] (ii) Which compound belongs to the same homologous series as C4H8Cl2? ………………..……………………………………….……………………………………… [1] (c) State the total number of compounds in Table 2.1 which are soluble in organic solvents. ……………………………………………………………………………………………………..… [1] (d) Draw the displayed formulae of two isomers of C2H4Cl2. [2] [Total: 6]

4 A3 Some physical prop