ACSBR 4NA 5105 2024 prelim Paper 4_edited

Name Class Index Number Anglo-Chinese School (Barker Road) PRELIMINARY EXAMINATION 2024 SECONDARY FOUR NORMAL (ACADEMIC) SCIENCE (CHEMISTRY) PAPER 4 5105/4 1 HOUR 15 MINUTES (FOR BOTH PAPERS) READ THESE INSTRUCTIONS FIRST Write your Name, Class and Index Number in the space provided at the top of this page and on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Section A Answer all questions. Write your answers in the spaces provided. Section B Answer one question. Write your answers in the spaces provided. A copy of the Periodic Table is printed on the last page. The use of an approved scientific calculator is expected, where appropriate. In calculations, you should show all the steps in your working, giving your answer at each stage. You are advised to spend no longer than 30 minutes on Paper 3. You may proceed to answer Paper 4 as soon as you have completed Paper 3. At the end of the examination hand in your answers to Paper 3 and Paper 4 separately. The number of marks is given in brackets [ ] at the end of each question or part question. This document consists of 11 printed pages. For Examiner’s Use Only Paper 3 /20 Paper 4 Section A /22 Paper 4 Section B /8 TOTAL /50

Anglo-Chinese School (Barker Road) Preliminary Examination 2024 Secondary Four Normal (Academic) Science (Chemistry) 5105 Paper 4 Page 2 Section A Answer all the questions in this section. 1 One of the isotopes of bromine has the symbol shown. Br3579 (a) Complete the table to show the relative mass and relative charge of the particles found in this isotope. particle relative mass relative charge electron proton 1+ neutron 1 [2] (b) Determine the number of each of these particles in one atom of the isotope of bromine, Br3579. number of electrons = …………………………… number of neutrons = …………………………… number of protons = …………………………… [2]

Anglo-Chinese School (Barker Road) Preliminary Examination 2024 Secondary Four Normal (Academic) Science (Chemistry) 5105 Paper 4 Page 3 2 The diagram shows how the components in petroleum (crude oil) can be separated into different fractions using fractional distillation. (a) Which of the fractions, A, B, C or D has the highest boiling point? ………………………………………………………..………………………………………. [1] (b) Suggest one compound likely to be present in fraction A. ………………………………………………………..………………………………………. [1] (c) Some fractions like diesel oil, which contain larger molecules, can be broken up into smaller molecules by a chemical reaction. C16H34 → substance E + C2H4 + C3H6 (i) Name the chemical reaction. ……