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CIE Nov 2015 v2 Paper 2 Q1
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![PMT Answer all the questions in the spaces provided. (a) Fill the gaps in the table for each of the given particles. type of particle charge symbol name of isotope carbon-13 electron con guration 1s22s22p2 37 17 Cl 1 sulfur-34 atom iron-54 cation 1s22s22p63s23p63d6 [5] (b) One of the factors that determines the type of bonding present between the particles of a substance is the relative electronegativities of the bonded particles. (i) Explain the meaning of the term electronegativity.[2] (ii) Name and describe the type of bonding you would expect tond between particles with equal electronegativities.[2] (iii) Name and describe the type of bonding you would expect tond between particles with very different electronegativities.[2]UCLES 2015 9701/22/O/N/15<br />
PMT (c) The boiling points of some molecules with equal numbers of electrons are given. substanceuorine argon formula boiling point / K F2 85 Ar 87 hydrogen chloride methanol HCl 188 CH3OH 338 (i) Explain why the boiling points ofuorine and argon are so similar.[2] (ii) Explain why the boiling point of hydrogen chloride is higher than that ofuorine.[2] (iii) Explain why methanol has the highest boiling point of all these molecules.[2] [Total: 17]UCLES 2015 9701/22/O/N/15 [Turn over<br />](https://learnah.org/wp-content/uploads/2018/08/November_2015_v2_QP_-_Paper_2_CIE_Chemistry_A-level_1-0.jpg)
![Page 2 Mark Scheme Syllabus Paper Cambridge International AS/A LevelOctober/November 2015 9701 22 Question Mark Scheme (a) name of type of isotope particle charge symbol electron configuration carbon-13 atom 13 1s 2s 2p PMT Mark Total chloride(-37) anion 1 Cl 1s 2s 2p 3s 3p [5] [5] sulfur-34 atom 34 16 1s 2s 2p 3s 3p iron-54 cation 2+ 54 26 (2 Fe 1s 2s 2p 3s 3p 3d (b) (i) ability / tendency / power of an atom / nucleus to attract / pull electron(s) in a covalent bond / shared pair of electrons / bonding pair of electrons (ii) Covalent overlap of orbitals OR shared pair(s) (of electrons) OR metallic positive ions / cations surrounded by delocalised electrons (iii) Ionic/electrovalent (electrostatic) Attraction between oppositely charged / +ve and ve ions (c) (i) similar strength / amount / number of intermolecular forces / induced dipole / van der Waals / VdW / London forces / LDF / dispersion forces therefore similar energy neededCambridge International Examinations 2015 [2] [2] [2] [2] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1]<br />
Page 3 Mark Scheme Syllabus Paper Cambridge International AS/A LevelOctober/November 2015 9701 22 Question Mark Scheme (ii) M1 HCl polar / has a dipole AND F2 non-polar / has no dipole OR (permanent) dipole (-dipole) attractions / forces between HCl (molecules) AND induced dipole (-induced dipole) attractions / forces / LDFs between F2 (molecules) M2 more energy needed for HCl than F2 OR pd-pd forces stronger than id-id forces OR IMFs / VdWs in HCl stronger than in F2 (iii) Hydrogen bonding (between methanol molecules) Stronger than IMFs / van der Waals in other three / is the strongest intermolecular force (a) M1 Heat (energy) change (or HprodHreact) measured at constant pressure OR enthalpy change when the amount/moles of reactants as shown in a (reaction) equation react together to give products M2 measured at standard conditions (b) (i) q = 2125.53 (ii) amount = 0.025(0) (iii) 85.(0) PMT Mark Total [1] [1] [1] [1] [2] [2] [17] [1] [1] [2] [1] [1] [1] [1] [1] [1]Cambridge International Examinations 2015<br />](https://learnah.org/wp-content/uploads/2018/08/November_2015_v2_MS_-_Paper_2_CIE_Chemistry_A-level_1-0.jpg)
