2023 RI H2 Chem Prelims P2 Questions

© Raffles Institution 2023 9729/02/S/23 [Turn Over RAFFLES INSTITUTION 2023 YEAR 6 PRELIMINARY EXAMINATION Higher 2 CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY 9729/02 Paper 2 Structured Questions 13 September 2023 2 hours Candidates answer on the Question Paper. Additional Materials: Data Booklet READ THESE INSTRUCTIONS FIRST Do not open this question booklet until you are told to do so. Write your name, class and index number in the spaces provided at the top of this page. 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. The use of an approved scientific calculator is expected, where appropriate. A Data Booklet is provided. Do not write anything in it. You are reminded of the need for good English and clear presentation in your answers. 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 1 / 10 2 / 13 3 / 15 4 / 11 5 / 14 6 / 12 Total / 75 This document consists of 23 printed pages and 1 blank page.

2 © Raffles Institution 2023 9729/02/S/23 [Turn Over Answer all the questions in the spaces provided. 1 (a) Chlorine is an element in Group 17 of the Periodic Table. Describe and explain how the volatilities of the halogens vary from chlorine to iodine. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… ……………………………………………………………………………………….. [2] (b) X has the formula PCl3+ and contains 31P, 35Cl and 37Cl. X is unstable and breaks down into two fragments, Y and Z. (i) Complete Table 1.1 to describe the characteristics of these particles. Table 1.1 X Y Z nucleon number 140 37 charge +1 +1 [1] X and Y were fired with equal velocity into an electric field. Fig. 1.1 (ii) On Fig. 1.1, draw the paths taken by particles X and Y as they pass through the electric field. Label your drawing clearly. [1]

3 © Raffles Institution 2023 9729/02/S/23 [Turn Over (iii) Deduce the number of 35Cl atoms in a particle of Y and give the shape of Y. number of 35Cl atoms in Y …………………………. shape of Y …………………………………………… [2] Electron affinity is a measure of the electrostatic attraction between an incoming electron and the nucleus – the stronger the attraction, the more energy is released. The first electron affinity of an element is the energy change when one mole of gaseous atoms acquires one mole of electrons to form one mole of singly negatively charged gaseous ions. Fig. 1.2 shows the trend in the first electron affinities of th