2025 H1 Chem Prelim Paper 2_HCI

This document consists of 21 printed pages and 1 blank page. © Hwa Chong Institution 2025 8873/02/Prelim [Turn over HWA CHONG INSTITUTION C2 Preliminary Examination Higher 1 CANDIDATE NAME CT GROUP 24S CHEMISTRY Paper 2 Structured Questions Candidates answer on the Question Paper Additional Materials: Data Booklet 8873/02 18 September 2025 2 hours READ THESE INSTRUCTIONS FIRST Write your name and CT group in the space provided at the top of this page. Write in dark blue or black pen. You may use a 2B pencil for any diagrams or graphs. Do not use staples, paper clips, glue, correction fluid or tapes. Section A Answer all the questions. Section B Answer one question. 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. FOR EXAMINERS’ USE ONLY Paper 2 Section A 1 / 11 2 / 8 3 / 14 4 / 12 5 / 15 Section B 6 or 7 / 20 / 80 Paper 1 / 30 TOTAL / 100

2 © Hwa Chong Institution 2025 8873/02/Prelim [Turn over Section A Answer all the questions in this section in the spaces provided. 1 (a) Table 1.1 lists the number of protons, neutrons and electrons in seven different particles. Each particle may be an atom, an anion or a cation. Table 1.1 particle number of protons number of neutrons number of electrons A 18 22 18 B 18 22 17 C 20 20 20 D 20 20 18 E 17 20 18 F 17 18 17 G 17 20 16 (i) Explain why particle E and particle F are a pair of isotopes of the same element. ……………………………………………………………………………..……….………... …………………………………………………………………………..……….………. [1] (ii) State the number of electron pairs in particle G. …………………………………………………………………………..…….…………. [1] (iii) Identify the pair of atoms of different elements with the same nucleon number. …………………………………………………………………………..…….…………. [1] (iv) Explain why particle C is larger than particle D. ……………………………………………………………………………..……….………... ……………………………………………………………………………..……….………... ……………………………………………………………………………..……….………... ……………………………………………………………………………..……….………... …………………………………………………………………………..……….………. [2]

3 © Hwa Chong Institution 2025 8873/02/Prelim [Turn over (v) Deduce how the behaviour of beams of particles B, E and G, differ in an electric field. ……………………………………………………………………………..……….………... ……………………………………………………………………………..……….………... ……………………………………………………………………………..……….………... ……………………………………………………………………………..……….………... ……………………………………………………………………………..……….………... ……………………………………………………………………………..……….………... …………………………………………………………………………..……….………. [2] (b) (i) Explain how the electronegativity of the elements in Period 3 influences the bonding in the chlorides. ……………………………………………………………………………..……….………... ……………………………………………………………………………..……….………... …………………………………………………………………………..……….………. [1] (ii) Write equations to show what h