ACJC H2 Chem 2021 Paper 3 (for exchange)

Name Index Number Form Class Tutorial Class Subject Tutor ANGLO-CHINESE JUNIOR COLLEGE DEPARTMENT OF CHEMISTRY Preliminary Examination CHEMISTRY 9729/03 Higher 2 Paper 3 Free Response 30 August 2021 2 hours Candidates answer on the Question Paper Additional Materials: Data Booklet READ THESE INSTRUCTIONS CAREFULLY Write your name, index number, form class, tutorial class and subject tutor’s name 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. Answer all questions in the spaces provided on the Question Paper. Section A Answer all the questions. Section B Answer one question. The use of an approved scientific calculator is expected, where appropriate. A Data Booklet is provided. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. Section Question No. For Examiner’s Use Marks A 1 2 3 4 B Presentation of answers TOTAL: 80 m This document consists of 31 printed pages and 1 blank page. 9729/03/Prelim/2021 ANGLO-CHINESE JUNIOR COLLEGE © ACJC 2021 Department of Chemistry [Turn over

2 © ACJC2021 9729/03/Prelim/2021 [Turn over Section A Answer all the questions in this section. 1 (a) Describe the reactions, if any, when separate samples of the oxides Na2O, Al2O3 and P4O10 are added to water. Write equations where appropriate and suggest the pH of any aqueous solution formed. [4] …………………………………………………………………………………………............. ……………………………………………………………………………………...…………... …………………………………………………………………………………………............. ……………………………………………………………………………………...…………... …………………………………………………………………………………………............. ……………………………………………………………………………………...…………... …………………………………………………………………………………………............. ……………………………………………………………………………………...…………... …………………………………………………………………………………………............. ……………………………………………………………………………………...…………... …………………………………………………………………………………………............. ……………………………………………………………………………………...…………... …………………………………………………………………………………………............. ……………………………………………………………………………………...…………... …………………………………………………………………………………………............. ……………………………………………………………………………………...…………... …………………………………………………………………………………………............. ……………………………………………………………………………………...…………... …………………………………………………………………………………………............. ……………………………………………………………………………………...…………... …………………………………………………………………………………………............. ……………………………………………………………………………………...…………...

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