Exam (elaborations) Chemistry Assessment2120

INSTRUCTIONS ● Answer all questions. ● Use a black or dark blue pen. You may use an HB pencil for any diagrams or graphs. ● Write your name, centre number and candidate number in the boxes at the top of the page. ● Write your answer to each question in the space provided. ● Do not use an erasable pen or correction fluid. ● Do not write on any bar codes. ● You may use a calculator. ● You should show all your working and use appropriate units. INFORMATION ● The total mark for this paper is 80. ● The number of marks for each question or part question is shown in brackets [ ]. ● The Periodic Table is printed in the question paper. IB23 06_0620_41/3RP © UCLES 2023 [Turn over This document has 16 pages. Any blank pages are indicated. Cambridge IGCSE™ PMT 2 © UCLES /41/M/J/23 1 Some symbol equations and word equations, A to J, are shown. A Fe3+ + 3OH– → Fe(OH)3 B H+ + OH– → H2O C ethane + chlorine → chloroethane + hydrogen chloride D C12H26 → C8H18 + C4H8 E ethene + steam → ethanol F chlorine + aqueous potassium iodide → iodine + aqueous potassium chloride G C6H12O6 → 2C2H5OH + 2CO2 H ethanoic acid + ethanol → ethyl ethanoate + water I calcium carbonate → calcium oxide + carbon dioxide J 6CO2 + 6H2O → C6H12O6 + 6O2 Use the equations to answer the questions that follow. Each equation may be used once, more than once, or not at all. Give the letter, A to J, for the equation that represents: (a) a neutralisation reaction ...................................................................................................... [1] (b) a precipitation reaction ........................................................................................................ [1] (c) the formation of an ester ...................................................................................................... [1] (d) photosynthesis ..................................................................................................................... [1] (e) fermentation ......................................................................................................................... [1] (f) cracking. ............................................................