2022 HCI H2 Chemistry Promo P2 QP

This document consists of 12 printed pages. HWA CHONG INSTITUTION C1 Promotional Examination Higher 2 CANDIDATE NAME CT GROUP 22S CHEMISTRY Paper 2 Structured Questions Candidates answer on the Question Paper. Additional Materials: Data Booklet 9729/02 28 September 2022 1 h 5 min READ THESE INSTRUCTIONS FIRST Write your name and CT group on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for diagrams and graphs only. 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. The number of marks is given in brackets [ ] at the end of each question or part question. FOR EXAMINERS’ USE ONLY Paper 1 (24%) Paper 2 (39%) Paper 3 (37%) TOTAL Q1 / 11 Q1 / 20 Q2 / 18 Q2 / Q3 / 15 Q3 / 11 Deductions (s.f.) Deductions (total) Deductions (units) / 20 / 40 / 35 100

2 © Hwa Chong Institution 2022 9729/02/C1 Promotional Exam 2022 [Turn over 1 Iron is the f ourth most abundant element on E arth. It is essential to all living things and has widespread industrial application. DO NOT WRITE IN THIS MARGIN (a) Describe the bonding in iron with the aid of a labelled diagram. ..………………………..……….…………………………………………………….……….…………… ..…………………………...…………………………………………………………….…….…………… ..……………………….…..…………………………………………………………….…….…………… ..…………………………....…………………………………………………………….…….……….. [2] (b) Iron, copper and zinc can be found in Period 4 of the Periodic Table. (i) Complete the electronic configurations of Cu+ and Zn+. Cu+: 1s2 2s2 2p6 ……………………………………..……………… Zn+: 1s2 2s2 2p6 ……………………………………..……………… [2] (ii) With reference to your answer in (b)(i), suggest why the second ionisation energy of copper is higher than that of zinc. ……………………………………………………………………………….….……….…………… ……………………………………………………………………………….….……….…………… ……………………………………………………………………………….….……….…………… ……………………………………………………………………………….….……….…………… ……………………………………………………………………………….….……….…………… ……………………………………………………………………………….….……….…………… ………………………………….………………………………………………….…….…………… ………………………………………….……………………………………….………………… [2]

3 © Hwa Chong Institution 2022 9729/02/C1 Promotional Exam 2022 [Turn over (c) Finely divided iron is used industrially as a catalyst in the Haber process to manufacture ammonia from nitrogen gas and hydrogen gas. The Haber process is typically carried out at 450 °C and 200 atm. N2(g) + 3H2(g) ˆ ˆ †‡ ˆ ˆ 2NH3(g) Hr = −92.0 kJ mol−1 DO NOT WRITE IN THIS MARGIN (i) By considering the rate of reaction and position