2024 HYSS Chem P2

HUA YI SECONDARY SCHOOL PRELIMINARY EXAM 2024 4-G3 NAME CLASS INDEX NUMBER CHEMISTRY 6092/02 PAPER 2 (XX) 20 August 2024 1 hour 45 minutes Additional Materials: Nil READ THESE INSTRUCTIONS FIRST Write your Name, Class, and Index Number on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, highlighters, glue, or correction fluid. Section A Answer all questions. Write your answers in the spaces provided. Section B Answer one question. Write your answers in the spaces provided. Section A 70 Section B 10 Total 80 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. The Periodic Table is provided on page 27. This document consists of 27 printed pages and 1 blank page. © HYSS 2024 No part of this document may be reproduced in any form or transmitted in any form or by any means without the prior permission of Hua Yi Secondary School. Setter: Mr Chong KQ

2 2024_4-G3_ PRELIMS_ CHEMISTRY _PAPER 2 Section A [70 marks] Answer all questions in the spaces provided. 1 Fig. 1.1 shows part of the Periodic Table with some elements shown. Fig. 1.1 Each element may be used once, more than once or not at all. Using the symbols in the diagram, give one element which (a) has a giant molecular structure, …….…...................................................................................................................... [1] (b) combines with oxygen to form a gas which contributes to acid rain, ………...................................................................................................................... [1] (c) forms an ion of type X+ which has only three completely filled shells of electrons, …….…..................................................................................................................... [1] (d) forms a chloride that is soluble and with excess sodium hydroxide solution ; the white precipitate remains insoluble, …….…..................................................................................................................... [1] (e) is often used in galvanisation to prevent rusting. ……………………………………………………………………………………………... [1] [Total: 5]

3 2024_4-G3_ PRELIMS_ CHEMISTRY _PAPER 2 2 Silicon is a Group 14 element and is the second most abundant element in the Earth’s crust. It can be extracted by heating sand (silicon dioxide, SiO 2) with carbon to temperatures approaching 2200 C, producing carbon monoxide as a side product. Naturally occurring silicon is composed of three stable isotopes and the mass spectrum of the isotopes are as shown in Fig. 2.1. Fig. 2.1 (a) Write a balanced chemical equation for the reduct