DHS_H2_CHEM_P1 Prelim

This question paper consists of 15 printed pages and 1 blank page. © DHS 2011 [Turn over Name: Index Number: Class: DUNMAN HIGH SCHOOL Preliminary Examination Year 6 H2 CHEMISTRY 9647/01 Paper 1 Multiple Choice 27 September 2011 1 hour Additional Materials: Optical Mark Sheet Data Booklet INSTRUCTIONS TO CANDIDATES 1 Write your name and class on this question paper. 2 There are forty questions on 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.

2 © DHS 2011 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 Samples of 10 cm 3 of each of the first four members of the alkane series are separately mixed with 70 cm 3 of oxygen. Each is then burned and the total volume, V, of the residual gas measured again at room temperature and pressure. Which graph represents the results that would be obtained? A B C D 2 In a historically famous experiment Wöhler heated ‘inorganic’ ammonium cyanate in the absence of air. The only product of the reaction was ‘organic’ urea, CO(NH 2)2. No other products were formed in the reaction. What is the formula of the cyanate ion present in ammonium cyanate? A CNO– B CNO2– C CO– D NO– CH4 C 3H8 C2H6 C4H10 CH4 C 3H8 C2H6 C4H10 80 60 40 20 0 80 60 40 20 0 CH4 C 3H8 C2H6 C4H10 CH4 C 3H8 C2H6 C4H10 80 60 40 20 0 80 60 40 20 0 80 60 40 20 0 80 60 40 20 0

3 © DHS 2011 9647/01 [Turn over 3 Which of the following helps to explain the existence of a large number of stable metallic ionic oxides? A Oxygen is too electronegative to form covalent bonds. B The enthalpy change of atomisation of oxygen is low. C Most metals have large ionisation energies. D The lattice energies of the oxides counterbalance the unfavourable electron affinity of oxygen. 4 Which of the following has the same value as the standard enthalpy change of formation of carbon monoxide? [Hc  and Hf  represent the standard enthalpy change of combustion and formation respectively.] A ½Hc  (C(graphite)) B Hf  (CO2) – Hc  (C(graphite)) C Hf  (CO2) – ½Hc  (C(graphite)) D Hc  (C(graphite)) – Hc  (CO) 5 The use of the Data Booklet is relevant to this question. Spatulas are often made from nickel. Which aqueous solution should not be stirred with a nickel spatula because a reaction could occur? A Co 2+ (aq) B Fe3+ (aq) C Mn2+ (aq) D V2+ (aq) 6 The reaction between P and Q in aqueous solution is acid–catalysed