2024 Zhenghua Prelim QP

ZHENGHUA SECONDARY SCHOOL PRELIMINARY EXAMINATION 2024 SECONDARY FOUR EXPRESS CHEMISTRY 6092/02 Paper 2 22 Aug 2024 1 hour 45 minutes Students answer on the Question Paper. No Additional Materials are required. Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School READ THESE INSTRUCTIONS FIRST Write your name, index number and class on all the work you hand in. Write in dark blue or black ink. 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 25. The use of an approved scientific calculator is expected, where appropriate. Name of Setter: Ms Nur Elfianie This document consists of 25 printed pages including the cover page. [Turn over Candidate Name: ______________________________ Index No: _____ Class: _________

2 Section A Answer all questions. 1 Different types of reactions are listed below. combustion precipitation displacement polymerisation electrolysis rusting Use the list to answer the questions. Name the process of, (a) burning petrol in unlimited supply of air ……………...………………………………………………………………………..………….. [1] (b) making barium sulfate from two soluble compounds ……………...………………………………………………………………………..………….. [1] (c) extracting sodium metal from its ore ……………...………………………………………………………………………..………….. [1] (d) oxidising iron metal in the presence of moisture ……………...………………………………………………………………………..………….. [1] [Total: 4]

3 2 Fig. 2.1 shows the apparatus for measuring the rate of diffusion of gases. Fig. 2.1 The time taken for 100 cm3 of argon, methane, nitrogen and oxygen gases at room temperature and pressure, to reach the diffusion plug were recorded. (a) (i) Deduce the order at which the four gases reach the diffusion plug from the first to the last. first ………………………………………..……… ………………………………………..……… ………………………………………..……… last ………………………………………..……… [1] (ii) Explain your answer in (a)(i). ………………………………………………………………..…….……………………….. ……………………………………………………………….…………………