BBSS Prelim P2

CHEMISTRY 6092/02 Paper 2 20 August 2024 0820-1005h 1 hour 45 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, index number and class in the spaces provided at the top of this page. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, highlighters, 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. At the end of the examination, fasten all your work securely together. 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 26. The use of an approved scientific calculator is expected, where appropriate. For Examiner’s Use Section A / 70 Section B / 10 Total / 80 This document consists of 26 printed pages. Name: ………………………………………. Index No: ……… Class: ……..… Bukit Batok Secondary School GCE O LEVEL PRELIMINARY EXAMINATIONS 2024 SECONDARY 4 EXPRESS

BBSS/O PRELIM/2024/Sec4E/Chem P2 Applying past knowledge to new situations 2 Section A Answer all questions in the spaces provided. The total mark for this section is 70. 1 The following article featured in a newspaper describes how increasing global temperatures due to global warming, grounding planes at the airport. Fig. 1.1 (a) A student explained that the increase in temperature leads to fewer molecules per unit volume. Explain, using Kinetic Particle Theory, how cooler periods of the day allow more lift for the airplane to take off. …………………………………………………………..……………………………… …………………………………………………………..……………………………… ........................................................................................................................ [2]

BBSS/O PRELIM/2024/Sec4E/Chem P2 Applying past knowledge to new situations 3 (b) Environmental groups think that the shrinking of the ice caps is the result of global warming. Satellite images are used to show the area of Arctic Sea ice as shown in Fig. 1.2. Fig. 1.2 (i) Give one consequence of the reduction of Arctic Sea ice. ………………………………………………………………………..……..…… ………………………………………………………………………………... [1] (ii) Describe one possible source of global warming that has led to the reduction of Arctic ice. ………………………………………………………………………..……..…… ………………………………………………………………………………... [1] (iii) Scientists are currently developing a process called carbon capture and storage (CCS). This will reduce the problem of global warming. There are three main steps to CCS. Firstly, carbon dioxide is trapped and separated from other gases produced in coal-powered electricity plants. The captured carbon dioxide is transported to a storage location. The car