2021 C1 Promo P2 QP

This document consists of 12 printed pages. HWA CHONG INSTITUTION C1 Promotional Examination Higher 2 CANDIDATE NAME CT GROUP 21S CHEMISTRY Paper 2 Structured Questions Candidates answer on the Question Paper Additional Materials: Data Booklet 9729/02 30 September 2021 Total: 1 h 5 min INSTRUCTIONS TO CANDIDATES Write your name and CT class on all the work you hand in. Answer all questions in the spaces provided in this Question Booklet. Write in dark blue or black pen. You may use a soft pencil for diagrams and graphs only. Do not use staples, paper clips, highlighters, glue or correction fluid. INFORMATION FOR CANDIDATES The number of marks is given in brackets [ ] at the end of each question or part question. A Data Booklet is provided. You may use a calculator. You are reminded of the need for good English and clear presentation in your answers. FOR EXAMINERS’ USE ONLY Paper 1 (24.2%) Paper 2 (38.7%) Paper 3 (37.1%) TOTAL Q1 / 8 Q1 / 20 Q2 / 12 Q2 / Q3 / 15 Q3 / 20 Deductions (s.f.) Deductions (total) Deductions (units) Deductions (margins) Deductions (others) / 20 / 40 / 35 100%

2 © Hwa Chong Institution 2021 9729/02/C1 Promo 2021 [Turn over A, 3L,1M 5(e) 1 (a) (i) The elements in Period 3 range from metals on the left of the Periodic Table to non - metals on the right. On the axes below, sketch the variations in melting point of the elements sodium to argon. melting point / oC Na Mg Al Si P4 S8 Cl2 Ar [1] DO NOT WRITE IN THIS MARGIN (ii) With reference to their structures and bonding, account for the variations in melting points of aluminium, silicon and argon. ……………………………………………………….………………………………………… ……………………………………………………….………………………………………… ……………………………………………………….………………………………………… ……………………………………………………….………………………………………… ……………………………………………………….………………………………………… ……………………………………………………….………………………………………… ……………………………………………………….………………………………………… ……………………………………………………….………………………………………… ……………………………………………………….………………………………………… ……………………………………………………….………………………………………… ……………………………………………………….………………………………………… ……………………………………………………….………………………………………… ……………………………………………………….………………………………………… ……………………………………………………….………………………………………… ……………………………………………………….………………………………………… ……………………………………………………….………………………………………… ………………………………………………………………………………………………[3]

3 © Hwa Chong Institution 2021 9729/02/C1 Promo 2021 [Turn over (b) A diagonal relationship is said to exist between certain pairs of diagonally adjacent elements in the second and third periods (first 20 elements) of the Periodic Table, d