Over 5 an important reaction which occurs in the

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Unformatted text preview: ich occurs in the catalytic converter of a car is 2CO(g) + 2NO(g) 2CO2(g) + N2(g) In this reaction, when 500 cm3 of CO reacts with 500 cm3 of NO at 650 °C (the operating temperature of the catalyst) and at 1 atm, the total volume of gases produced at the same temperature and pressure is A 500 cm3 B 750 cm3 C 1000 cm3 D impossible to calculate without knowing the molar volume of gases under these conditions. (Total for Question 5 = 1 mark) 6 When a solution of barium chloride is added to sulfuric acid, a white precipitate is formed. The ionic equation (including state symbols) for this reaction is A H+(aq) + Cl–(aq) B Ba+(aq) + SO4–(aq) BaSO4(s) C Ba2+(aq) + 2SO4–(aq) Ba(SO4)2(s) D Ba2+(aq) + SO42–(aq) BaSO4(s) HCl(s) (Total for Question 6 = 1 mark) 7 The enthalpy change for the reaction between hydrochloric acid and sodium hydroxide is –56 kJ mol–1. Therefore A the reaction is exothermic and the temperature rises. B the reaction is exothermic and the temperature falls. C the reaction is endothermic and the temperature rises. D the reaction is endothermic and the temperature falls. (Total for Question 7 = 1 mark) 4 *P38433A0424* 8 The standard enthalpy changes of formation of some sulfur species are: Species Hf / kJ mol–1 S8(s) 0 S8(g) +103 S(g) +279 The enthalpy of atomization of sulfur is (in kJ mol–1) A 103 ÷ 8 B 279 ÷ 8 C 279 D (103 ÷ 8) + 279 (Total for Question 8 = 1 mark) 9 For which of the following reactions is the enthalpy change equal to the bond enthalpy of H–I? A HI(g) ½H2(g) + ½I2(s) B HI(g) ½H2(g) + ½I2(g) C HI(g) H(g) + I(g) D HI(g) H+(g) + I–(g) (Total for Question 9 = 1 mark) Use this space for any rough working. Anything you write in this space will gain no credit. *P38433A0524* 5 Turn over 10 The equation for the complete combustion of pentane is C5H12(g) + 8O2(g) 5CO2(g) + 6H2O(l) Hc = –3509 kJ mol–1 The standard enthalpy change of formation of CO2(g) is –394 kJ mol–1 and that of H2O(l) is –286 kJ mol–1. The standard enthalpy change of formation of pentane (in kJ mol–1) is A 5(–394) + 6(–286) + (–3509) B 5(–394) + 6(–286) – (–3509) C –5(–394) – 6(–286) + (–3509) D –5(–394) – 6(–286) – (–3509) (Total for Question 10 = 1 mark) 11 All alkenes have A the same empirical formula and the same general formula. B the same molecular formula and the same general formula. C the same molecular formula and the same empirical formula. D the same empirical formula and the same structural formula. (Total for Question 11 = 1 mark) 12 Covalent bonding results from the strong electrostatic attractions between A instantaneous dipoles. B electron clouds. C electrons in the bonding pair. D bonding pairs of electrons and nuclei. (Total for Question 12 = 1 mark) Use this space for any rough working. Anything you write in this space will gain no credit. 6 *P38433A0624* 13 This question concerns the reaction of hydrogen bromide with propene. (a) This reaction requires (1) A normal laborator...
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