RI 2019 Year 5 CT QP

RAFFLES INSTITUTION 2019 YEAR 5 TERM 3 COMMON TEST Higher 2 CHEMISTRY 9729 5 July 2019 2 hours 15 minutes Additional Materials: Multiple Choice Answer (OMR) Sheet Writing Paper Data Booklet READ THESE INSTRUCTIONS FIRST Write your name, index number and civics tutorial group in the spaces provided on the OMR Sheet, the cover sheets on pages 11 and 13, and the writing paper used for Section C. Do not use staples, paper clips, highlighters, glue or correction fluid. This paper consists of three sections, A, B and C. Section A (15 marks) Answer this section first. The OMR sheet will be collected after the first 30 minutes. There are fifteen questions in this section. 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. Read the instructions on the OMR Sheet very carefully. 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 (30 marks) There are three questions in this section. Answers to this section are to be written in the spaces provided in the question paper. Section C (35 marks) There are two questions in this section. Answers to this section are to be written on the writing paper provided. You are to begin each question on a fresh sheet of paper. Write in dark blue or black pen. You may use a pencil for any diagrams or graphs. You are reminded of the need for good English and clear presentation in your answers. At the end of the examination, fasten your answers to Section C securely together. Answers to Sections A, B and C are to be handed in separately. The number of marks is given in brackets [ ] at the end of each question or part question. This document consists of 20 printed pages and 1 blank page. This document is copyrighted, please do not reproduce it without permission

2 © Raffles Institution 2019 9729/J/19 [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 Use of the Data Booklet is relevant to this question. A sample of boron contains sodium as the only impurity. The information in the table was obtained by mass spectrometry of the sample. mass number 10 11 23 % abundance 15.52 74.48 10.00 What is the Ar of boron in the sample? A 9.74 C 12.04 B 10.83 D 13.08 2 Under acidic conditions, V2O5 undergoes a redox reaction with Fe2+.