RI 2023 Y5 Promo QP

Name: ( ) Class: 24S0______ RAFFLES INSTITUTION 2023 YEAR 5 PROMOTION EXAMINATION Higher 2 CHEMISTRY 9729 28 September 2023 2 hours 30 minutes Additional Materials: Multiple Choice Answer (OMR) Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write your name, 6-digit exam index number and civics tutorial group in the spaces provided on the OMR sheet and the cover sheets on pages 1 and 19. Shade your 6-digit exam index number on the OMR sheet. This paper consists of three sections, A, B and C. Section A (15 marks) consists of 15 multiple-choice questions. Answer this section first. The OMR sheet will be collected after the first 30 minutes. For each question there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the OMR sheet. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in the question paper. Section B (35 marks) consists of 3 structured questions. Answer all questions in the spaces provided in the question paper. If additional space is required, you should use the page at the end of the booklet for Section B (page 18 ). The question number must be clearly shown. Section C (40 marks) consists of 3 free-response questions. Answer all questions in the spaces provided in the question paper. If additional space is required, you should use the pages at the end of the booklet for Section C (page s 31 – 32). The question number must be clearly shown. This document consists of 30 printed pages and 2 blank pages. Write in dark blue or black pen. You may use a HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. The use of an approved scientific calculator is expected, where appropriate. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use Only B1 / 10 B2 / 11 B3 / 14

2 © Raffles Institution 2023 9729/S/23 [Turn Over Section A (15 marks) For each question, there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 Methylamine, CH3NH2, is a colourless gas at room temperature. The following equation shows the complete combustion of CH3NH2. 4CH3NH2 + 9O2 → 4CO2 + 2N2 + 10H2O In an experiment, 20 cm 3 of CH3NH2 is mixed with 60 cm 3 of O2 at room temperature and pressure. The mixture is sparked, resulting in the complete combustion of CH 3NH2. The mixture is then cooled