2022 RVHS JC2 H2 CM Prelim P3 (QP)

River Valley High School 9729/03/PRELIMS/22 2022 Preliminary Examination [Turn over RIVER VALLEY HIGH SCHOOL JC 2 PRELIMINARY EXAMINATION CANDIDATE NAME CLASS 2 1 J CENTRE NUMBER S INDEX NUMBER H2 CHEMISTRY 9729/03 Paper 3 Free Response 20 September 2022 2 hours Candidates answer on the Question Paper. Additional Materials: Data Booklet READ THESE INSTRUCTIONS FIRST Write your name, class and index number in the spaces 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. If additional space is required, you should use the pages at the end of this booklet. The question number must be clearly shown. Section A Answer all the questions. Section B Answer one question. Circle the question number of the question you attempted. The use of an approved scientific calculator is expected, where appropriate. A Data Booklet is provided. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use Question number 1 2 3 4 5 units s.f. Total Marks 17 20 23 20 20 80 This document consists of 28 printed pages.

2 River Valley High School 9729/03/PRELIMS/22 2022 Preliminary Examination Section A Answer all the questions in this section. 1 In the third period of the Periodic Table, there is considerable variation of chemical and physical properties from sodium to argon. (a) The graph below shows the first ionisation energy from sodium to argon. (i) Write an equation to represent the first ionisation energy of sulfur. [1] (ii) Account for the difference in first ionisation energy of Mg and Al. [1] ……………………………………………………………………………………. ……………………………………………………………………………………. ……………………………………………………………………………………. ……………………………………………………………………………………. ……………………………………………………………………………………. ……………………………………………………………………………………. (b) Calcium carbonate decomposes when heated to about 700 °C. Copper(II) carbonate also undergoes a similar decomposition reaction when heated. (i) Write a balanced equation for the thermal decomposition of copper carbonate. [1] (ii) By quoting relevant values from the Data Booklet, state and explain if the thermal decomposition temperature of copper( II) carbonate is expected to be lower or higher than that of calcium carbonate. [2]

3 River Valley High School 9729/03/PRELIMS/22 2022 Preliminary Examination [Turn over ……………………………………………………………………………………. ……………………………………………………………………………………. ……………………………………………………………………………………. ……………………………………………………………………………………. ……………………………………………………………………………………. ……………………………………………………………………………………. ……………………………………………………………………………………. ……………………………………………………………………………………. ……………………………………………………………………………………. ……………………………………………………………………………………. …………………………………………………………………………