DHS H2 Chem 2013 Prelim P1 QP

1 This question paper consists of 18 printed pages and 0 blank page © DHS 2013 [ T u r n o v e r Name: Index Number: Class: DUNMAN HIGH SCHOOL Preliminary Examination Year 6 H2 CHEMISTRY 9647/01 Paper 1 Multiple Choice 27 September 2013 60 minutes Additional Materials: Optical Mark Sheet Data Booklet INSTRUCTIONS TO CANDIDATES 1 Write your name, index number and class on this question paper. 2 There are forty questions in this paper. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate Optical Mark Sheet. 3 Each correct answer will score one mark. A mark will not be deducted for wrong answer. 4 Any rough working should be done in this booklet. 5 You may use a calculator.                 473

2 © DHS 2013 9647/01 [Turn over Section A For each question, there are four possible answers A, B, C, and D. Choose the one you consider to be correct. 1 A 1.0 g sample containing 0.0065 mol of organoboron compound, with the formula CxHyBOz, was burnt in an excess of oxygen. The carbon dioxide and steam produced were passed into solid NaOH and P 2O5, which increased in mass by 2.29 g and 0.877 g respectively. What is the molecular formula of the organoboron compound? A CH2BO2 B C8H7BO2 C C8H15BO2 D C9H15BO 2 SO2 gas is found in air near volcanoes. 218.4 cm 3 of SO 2 collected at s.t.p. near a volcano was reacted with 25.0 cm3 of 0.130 mol dm–3 acidified potassium dichromate solution to turn the solution from orange to green. What is the oxidation state of sulfur at the end of the reaction? A 0 B +2 C +4 D +6 3 Varying volumes of H 2O2 of an unknown concentration was reacted with varying volumes of 0.50 mol dm –3 acidified potassium manganate( VII) in a series of experiments, to produce the graph below. The total volume of solutions used in each experiment was 100 cm 3. In each experiment, the difference between the highest temperature reached and the initial temperature was calculated, and was plotted against the volume of H2O2 used. What is the concentration of H2O2 and the enthalpy change of the reaction per mole of H2O2? Assume specific heat capacity of the solution is 4.2 J g –1 K–1 and the density of the solution is 1 g cm-3. [H2O2] Enthalpy change of reaction A 0.536 mol dm–3 +151 kJ mol–1 B 0.214 mol dm–3 +378 kJ mol–1 C 0.536 mol dm–3 +378 kJ mol–1 D 0.214 mol dm–3 +151 kJ mol–1 ∆T/ ºC Volume of H2O2/ cm3 70 13.5 474

3 © DHS 2013 9647/01 [Turn over 4 Elements W, X, Y and Z are four consecutive elements in the Periodic Table. The following table shows the first four ionisation energies of each element. Element 1 st I.E 2 nd I.E 3 rd I.E 4 th I.E W 1685 3374 6050 8408 X 2081 3952 6122 9371 Y 496 4562 6910 9543 Z 738 14