RI 2018 Y5 Promo QP

1 © Raffles Institution 2018 9729/S/18 [Turn Over RAFFLES INSTITUTION 2018 Year 5 Promotion Examination HIGHER 2 CHEMISTRY 9729 28 September 2018 2 hours 40 minutes Additional Materials: Multiple Choice Answer Sheet Data Booklet Writing Paper READ THESE INSTRUCTIONS FIRST DO NOT open this booklet until you are told to do so. Write your name and civics tutorial group in the spaces provided on the OMR sheet, cover sheets on pages 2 and 14 and writing paper. 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. Record your answers to this section in soft pencil on the separate OMR Answer Sheet. Section B (35 marks) consists of 3 structured questions. Answers to this section are to be written in the spaces provided in the question paper. Section C (40 marks) consists of 3 free-response questions. Answers to this section are to be written on the writing paper provided. You are to begin each question on a fresh page of paper. You are reminded of the need for good English and clear presentation in your answers. The number of marks is given in brackets [ ] at the end of each question or part question. Write in dark blue or black pen. You may be subjected to penalty for writing answers in pencil. At the end of the examination, fasten your answers to Section C and the cover sheet on page 2 securely together. Answers to Sections B and C are to be handed in separately. This document consists of 23 printed pages. This document is copyrighted, please do not reproduce it without permission

2 © Raffles Institution 2018 9729/S/18 [Turn Over RAFFLES INSTITUTION 2018 Year 5 Promotion Examination H2 Chemistry COVER SHEET Name: ( ) Class: For Examiner’s Use Only Section Marks C1 / 11 C2 / 15 C3 / 14 Fasten your answers to Section C and this cover sheet securely together. C This document is copyrighted, please do not reproduce it without permission

3 © Raffles Institution 2018 9729/S/18 [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 When sulfur is boiled with sodium hydroxide solution, the initial reaction results in the formation of S2– and SO32– ions. What is the mole ratio of S : S 2– : SO32– in the balanced equation for this reaction? A 2 : 1 : 1 B 3 : 2 : 1 C 3 : 1 : 2 D 4 : 1 : 3 2 In an experiment, 10 cm3 of a gaseous compound, CxHySz, was exploded with 100 cm3 of oxygen