RI 2021 Y5 Promo QP

1 Name: ( ) Class: 22S0______ RAFFLES INSTITUTION 2021 YEAR 5 PROMOTION EXAMINATION Higher 2 CHEMISTRY 9729 28 September 2021 2 hours 10 minutes Additional Materials: Multiple Choice Answer (OMR) Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write your name, index number and civics tutorial group in the spaces provided on the OMR Sheet, and the cover sheets on pages 1 and 17. Do not use staples, paper clips, 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. Answer all questions. 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 (35 marks) There are three questions in this section. Answer all questions. Answers to this section are to be written in the spaces provided in the question paper. Section C (25 marks) There are two questions in this section. Answer all questions. Answers to this section are to be written in the spaces provided in the question paper. The use of an approved scientific calculator is expected, where appropriate. This document consists of 25 printed pages. 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. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use Only B1 / 14 B2 / 9 B3 / 12

2 © Raffles Institution 2021 9729/S/21 [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 An element forms a triatomic molecule, E. The Avogadro constant is L. How many atoms are present in 1 cm3 of gaseous E at room temperature and pressure? A L 24000 B 3L 24 C 3L 24000 D 3L 22700 2 H2S reacts with SO2 to give S and H2O. Assuming the reaction goes to completion, how many moles of H 2S and SO2 would result in a mixture containing equal numbers of moles of H2S and S? moles of H2S moles of SO2 A 3 1 B 4 2 C 4 4 D 5 1 3 The first seven ionisation energies of a