Copy of CHS 2024_S4_OP_Prelim Paper 2 Section A

[Turn Over Name: Index Number: Class: CATHOLIC HIGH SCHOOL Preliminary Examination Secondary 4 ‘O’ Level Programme CHEMISTRY 6092/02 Paper 2 20 August 2024 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. Write your answers 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. A maximum of 1 mark will be deducted from your total mark for failure to show your working with clear statements in calculations and misuse of units and/or significant figures, i.e. failure to quote units where necessary, the inclusion of units in quantities defined as ratios or quoting answers to an inappropriate number of significant figures. For examiner’s use only: Section A / 70 working / units / significant figures  −1 if checked This document consists of 18 printed pages and 2 blank pages. A

2 Section A Answer all questions. 1 Some chemical and word equations, A to J, are shown. A glucose → ethanol + carbon dioxide B HNO3 + NaOH → NaNO3 + H2O C water → hydrogen + oxygen D C12H26 → C8H18 + C4H8 E ethanoic acid + ethanol ⇌ ethyl ethanoate + water F ethene + steam → ethanol G 2CH4 + 3O2 → 2CO + 4H2O H C2H6 + Cl2 → C2H5Cl + HCl I C6H12O6 + 6O2 → 6CO2 + 6H2O J 2HCl + Pb(NO3)2 → PbCl2 + 2HNO3 Use the equations to answer the questions that follow. Each equation may be used once, more than once, or not at all. Write down the letter, A to J, for the equation which represents: (a) cracking ……………………………………………….………………….………………………..…….. [1] (b) neutralisation ………………………………………………………………..….…………………...…..…….. [1] (c) precipitation …………………………………………………………………...…………………...…..…….. [1] (d) respiration ……………………………………………………………….………..……………...…..…….. [1] (e) substitution ……………………………………………………………….………………..……...…..…….. [1] [Total: 5]

3 [Turn Over 2 Table 2.1 shows the structural formula of monomers, structure of repeat unit of polymers and type of reaction used to form polymers A and B. Complete the table by filling in the missing information. Table 2.1 polymer structural formula of monomer(s) structure of repeat unit of polymer type of reaction used to form polymer A CH3CH=CH2 ……………………. B HOOC–(CH2)4–COOH H2N−(CH2)6−NH2 ……………………. [4] [Total: 4]

4 3 Car engines