2019 TMJC H2 Chem Prelim P4 QP

Tampines Meridian Junior College 2019 JC2 Prelim H2 Chemistry CANDIDATE NAME CIVICS GROUP _______________________________________________________________________________ H2 CHEMISTRY 9729/04 Paper 4 Practical 4 September 2019 2 hours 30 minutes Candidates answer on the Question Paper. Additional materials: As listed in the Confidential Instructions _______________________________________________________________________________ READ THESE INSTRUCTIONS FIRST Write your name and Civics Group in the spaces at the top of the page. Give details of the practical shift and laboratory where appropriate, in the boxes provided. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Answer all questions in the spaces provided on the Question Paper. The use of an approved scientific calculator is expected, where appropriate. You may lose marks if you do not show your working or if you do not use appropriate units. Qualitative Analysis Notes are printed on pages 17 and 18. 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. ________________________________________________________________________________________ This document consists of 18 printed pages. TAMPINES MERIDIAN JUNIOR COLLEGE JC2 PRELIMINARY EXAMINATION Shift Laboratory For Examiner's Use 1 2 3 Total

2 Tampines Meridian Junior College 2019 JC2 Prelim H2 Chemistry Answer all the questions in the spaces provided. 1 Determination of the concentration of a base and the enthalpy change of the neutralisation reaction FA 1 is 2.0 mol dm–3 sulfuric acid, H2SO4. FA 2 is aqueous sodium hydroxide, NaOH. The reaction of sulfuric acid and sodium hydroxide is exothermic. In separate experiments, you will add increasing volumes of FA 2 to a fixed volume of FA 1. In each experiment you will measure the maximum temperature rise, ∆T. As the volume of FA 2 is increased, this maximum temperature rise, ∆T, will increase and then decrease. By measuring the maximum temperature rise for different mixtures of the two reagents , you are to determine the following:  the concentration of sodium hydroxide, NaOH, in FA 2  the enthalpy change when 1 mol of H2SO4 is neutralised by NaOH (a) Method  Fill the labelled burette with FA 1.  Support a styrofoam cup in the 250 cm3 beaker.  Run 10.00 cm3 of FA 1 from the burette into the styrofoam cup.  Measure 20.0 cm3 of FA 2 using a measuring cylinder.  Place the thermometer in the FA 2 in the measuring cylinder and record the steady temperature of the solution.  Pour the FA 2 into the styrofoam cup, stir and record the maximum temperature obtained in the reaction.  Empty and rinse the styrofoam cup; shake dry the styrofoam cup. Rinse the thermometer.  Carry out