CJC_Prelim H2 Chem 2008 P2

Name Class CATHOLIC JUNIOR COLLEGE PRELIMINARY EXAM 2008 CHEMISTRY 9746/02 CHEMISTRY 9746/02 Higher 2 Higher 2 Paper 2 Structured Questions 26 August 2008 Paper 2 Structured Questions 26 August 2008 Candidates answer on the Question Paper. 1 hour 30 mins Candidates answer on the Question Paper. 1 hour 30 mins Additional Materials: Data Booklet Additional Materials: Data Booklet READ THESE INSTRUCTIONS FIRST READ THESE INSTRUCTIONS FIRST Write your name and class in the spaces at the top of this page. Write your name and class in the spaces at the top of this page. Write in dark blue or black pen. Write in dark blue or black pen. You may use a soft pencil for any diagrams, graphs or rough working. You may use a soft pencil for any diagrams, graphs or rough working. Do not use correction fluid. Do not use correction fluid. Answer all questions. Answer all questions. You are advised to show all working in calculations. You may use a calculator. You are advised to show all working in calculations. You may use a calculator. A Data Booklet is provided. A Data Booklet is provided. The number of marks is given in brackets [ ] at the end of each question or part The number of marks is given in brackets [ ] at the end of each question or part question. question. For Examiner’s Use 1 2 3 4 5 6 Total 60 This document consists of 9This document consists of 9 printed pages and 1 blank page.

2 1 Explain the following observations: (a) Sulphur has a lower first ionisation energy than phosphorus. …………………………………………………………………………………………….. …………………………………………………………………………………………….. …………………………………………………………………………………………….. [2] (b) Carbon dioxide and silicon dioxide have widel y different melting points. …………………………………………………………………………………………….. …………………………………………………………………………………………….. …………………………………………………………………………………………….. [2] (c) 2-Nitrophenol has a lower me lting point than 4-nitrophenol. [2] (d) The boiling points of hydrogen ha lides are of the following order. Compound HF HCl HBr HI Boiling point/ °C 19.4 -85.1 -66.4 -35.6 …………………………………………………………………………………………….. …………………………………………………………………………………………….. …………………………………………………………………………………………….. …………………………………………………………………………………………….. [2] (e) The bond angle in PCl 3 is larger than that in AsCl3. …………………………………………………………………………………………….. …………………………………………………………………………………………….. …………………………………………………………………………………………….. [2] [Total: 10] CJC 2008 9746/02/prelim/08

3 Use of the Data Booklet is relevant to this question. 2 A 1.00 g sample of steel was dissolved in excess nitric acid. The resulting solution was found to contain manganese(II) ions. On addition of sodium bismuthate, NaBiO3, all the manganese(II) ions were oxidised to manganate(VII) ions. After removing any excess bismut hate ions, the resulting purple