2023_ASRJC_H2_Chem_Prelim_P3_QP

ASRJC JC2 PRELIM 2023 9729/03/H2 [Turn over ANDERSON SERANGOON JUNIOR COLLEGE 2023 JC 2 PRELIMINARY EXAMINATION NAME:______________________________ ( ) CLASS: 23 / _____ CHEMISTRY 9729/03 Paper 3 Free Response Questions 18 September 2023 2 hours Candidates answer on the Question Paper. Additional Materials: Data Booklet 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. Answer all questions in the spaces provided on the Question Paper. If additional space is required, you should use the pages at the end of this booklet. The question number must be clearly shown. Section A Answer all questions Section B Answer one question A Data Booklet is provided. The use of an approved scientific calculator is expected, where appropriate. 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. For Examiner’s Use Paper 3 A1 / 15 Paper 1 (15%) / 30 A2 / 22 Paper 2 (30%) / 75 A3 / 23 Paper 3 (35%) / 80 B4* / 20 Paper 4 (20%) / 55 B5* / 20 Percentage *Circle the question you have attempted Grade This document consists of 32 printed pages.

2 ASRJC JC2 PRELIM 2023 9729/03/H2 Section A Answer all the questions in this section. 1 (a) (i) Describe and explain the relative basicities of methylamine, dimethylamine and trimethylamine in the gas phase. [3] (ii) Explain why amides are neutral. [1] ………………………………………………………………………………………………... ………………………………………………………………………………………………... ………………………………………………………………………………………………... ……………………………………………………………………………………………...… ……………………………………………………………………………………………...… ………………………………………………………………………………………………... ………………………………………………………………………………………………... ………………………………………………………………………………………………... ………………………………………………………………………………………………... ………………………………………………………………………………………………... ………………………………………………………………………………………………... ………………………………………………………………………………………………... ………………………………………………………………………………………………... ………………………………………………………………………………………………... ………………………………………………………………………………………………... ………………………………………………………………………………………………... ………………………………………………………………………………………………... ………………………………………………………………………………………………... ………………………………………………………………………………………………... ………………………………………………………………………………………………... ………………………………………………………………………………………………... ………………………………………………………………………………………………... …………………………………………………………………………………………