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CIE Nov 2013 v3 Paper 4 Q2
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![Examiners For Use (a) State two assumptions of the kinetic theory of gases, as applied to ideal gases.[2] (b) (i) State the conditions of temperature and pressure under which real gases behave least like an ideal gas.(ii) Explain why real gases do not behave ideally under these conditions.[2] (c) Gaseous aluminium chloride is dimeric at low temperatures, but the dimer dissociates on heating. Al 2Cl 6(g) 2Al Cl 3(g) (i) State whether this dissociation is endothermic or exothermic. Explain your answer.(ii) Choose one reaction in organic chemistry that is catalysed by Al Cl 3, and write the structural formulae of the reactants and products in the boxes below. Al Cl 3 [3] [Total: 7]UCLES 2013 9701/43/O/N/13 [Turn over<br />](https://learnah.org/wp-content/uploads/2018/08/November_2013_v3_QP_-_Paper_4_CIE_Chemistry_A-level_2.jpg)
![Page 3 Mark Scheme Syllabus Paper GCE A LEVELOctober/November 2013 9701 43 (a) any two from: molecules have negligible volume negligible intermolecular forces or particles are not attracted to each other or to the walls of the container random motion no loss of kinetic energy during collisions or elastic collisions (NOT elastic molecules) 2[1] [2] (b) (i) low temperature and high pressure both required [1] (ii) (at low T) forces between particles are more important, (at high P) volume of molecules are significant [1] [1] [3 max 2] (c) (i) endothermic; because the equilibrium moves to the right on heating or with increasing temperature or because bonds are broken during the reaction [1] (ii) e.g. halogenation or Friedel-Crafts alkylation / acylation other possibilities: Cl 2, I 2, RCl, RCOCl etc. reactants [1] products [1] [3] [Total: 7]Cambridge International Examinations 2013<br />](https://learnah.org/wp-content/uploads/2018/08/November_2013_v3_MS_-_Paper_4_CIE_Chemistry_A-level_2.jpg)