PJC H2 Chem 2012 Prelim P2 QP

PIONEER JUNIOR COLLEGE JC2 PRELIMINARY EXAMINATION HIGHER 2 CANDIDATE NAME CT GROUP 1 1 INDEX NUMBER CHEMISTRY 9647/02 Paper 2 Structured 10 September 2012 2 hours Additional Materials: Data Booklet READ THESE INSTRUCTIONS FIRST Write your Centre number, index number and name on all work you hand in. Write in dark blue or black pen on both sides of the paper. You may use a soft pencil for any diagrams, graphs or rough workings. Do not use staples, paper clips, highlighters, glue or correction fluid. Answer all questions. 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. FOR EXAMINER’S USE Paper 2 1 / 12 6 / 12 2 / 9 7 / 9 3 / 15 4 / 7 Penalty sf units 5 / 8 Total / 72 This document consists of 19 printed pages.

© PJC 2012 9647/02/JC2 Prelim/2012 2 Answer all the questions in the spaces provided. 1 Planning (P) You are provided with solutions FA 1, FA 2 and FA 3. FA 1 and FA 2 are either 1.0 mol dm –3 nitric acid or 1.0 mol dm–3 ethanoic acid whereas FA 3 is 2.0 mol dm–3 sodium hydroxide. You are to plan an experiment that will enable you to identify FA 1 and FA 2 , and hence, calculate the enthalpy change of neutrali sation for the reaction between ethanoic acid and sodium hydroxide. You are provided with the following apparatus: a thermometer, a polystyrene cup, other common apparatus in the laboratory (a) State the independent and dependent variable s when determining the identity of each solution, FA 1 and FA 2. [1] Independent variable …………………………………………………………………… Dependent variable ……………………………………………………………………... (b) Plan an experiment to identify which of the two solutions, FA 1 and FA 2 , is 1.0 mol dm–3 nitric acid and which is 1.0 mol dm–3 ethanoic acid. Your plan must identify the acids solely based on the change in temperature. Mathematical processing of the temperature change is thus not required. Your plan should give a step by step description of the method including: · the apparatus used for measurement · appropriate volumes of reagents · how you would measure the various variables [3] ……………………………………………………………………………………............. ................................................................................................................................ ................................................................................................................................ ................................................................................................................................

© PJC 2012 9647/02/JC2 Prelim/2012 3 ................................................................................................