2025 AMKSS Prelim P2 QP

[Turn Over Candidate NameForm Class Index Number ANG MO KIO SECONDARY SCHOOLPRELIMINARY EXAMINATION 2025SECONDARY FOUR EXPRESSCHEMISTRY6092/02Paper 229 August 20251 hour 45 minutesSetter: Mr Vincent VooCandidates answer on the Question Paper.No Additional Materials are required.READ THESE INSTRUCTIONS FIRSTWrite your name, class and index number in the spaces provided at the top of this paper.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.Section A Answer all questions.Write your answers in the spaces provided.Section B Answer one question.Write your answers in the spaces provided.The number of marks is given in brackets [ ] at the end of each question or part question.A copy of the Periodic Table is printed on page 21.The use of an approved scientific calculator is expected, where appropriate.This document consists of 21 printed pages and 1 blank page.

2 AMKSS 4E Prelim Exam6092/02/2025 Section AAnswer all questions.1Table 1.1 shows the atomic structure of six particles, represented by the letters P to U. These particles are either atoms or ions, and the letters are not the symbols of the elements.Table 1.1particlesnumber of electronsnumber of protonsnumber of neutronsP121212Q222R666S101212T668U7714Use the letters, P to U to answer the following questions.(a)Which two particles are an atom and an ion of the same element?…………………………………………………………………………………………….[1](b)Which particle is chemically unreactive?…………………………………………………………………………………………….[1](c)Write the formula of the compound formed between particles P and U.…………………………………………………………………………………………….[1](d)Draw the electronic structure of particle S by showing all electrons.[1][Total: 4]

3 AMKSS 4E Prelim Exam6092/02/2025[Turn Over 2Substance X is formed by burning phosphorus in a limited supply of oxygen gas. Fig. 2.1 shows the structure of substance X. (a)What type of bonding is present in substance X? Explain your answer.…………………………………………………………………………………………….…………………………………………………………………………………………….…………………………………………………………………………………………….[2](b)Write the chemical formula of substance X.…………………………………………………………………………………………….[1](c)Substance X forms a liquid when heated to 23.8 oC. In terms of its structure, predict and explain the electrical conductivity of pure liquid X.…………………………………………………………………………………………….…………………………………………………………………………………………….…………………………………………………………………………………………….…………………………………………………………………………………………….[2]

4 AMKSS 4E Prelim Exam6092/02/2025 (d)Substance X reacts with water to form a colourless solution Y. With reference to the pH of water, predict and explain the pH of solution Y.…………………………………………………………………………………………….…………………………………………………………………………………………….…………………………………………………………………………………………….…………………………………………………………………………………………….[2][Total: 7]3Table 3.1 shows the bond energies of some bonds.Table 3.1bondbond energy (kJ/mol)C − Cl339C − H413H − Cl431C − F495C = C610Chlorodifluoromethane is used to make tetrafluoroethen