CIE Jun 2017 v1 Paper 2 Q2 (with explained solutions) |

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CIE Jun 2017 v1 Paper 2 Q2

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Structure and bonding can be used to explain many of the properties of substances. PMT (a) Copper, ice, silicon(IV) oxide, iodine and sodium chloride are all crystalline solids. Complete the table with:the name of a type of bonding found in each crystalline solid, the type of lattice structure for each crystalline solid. crystalline solid type of bonding type of lattice structure copper ice silicon(IV) oxide iodine sodium chloride (b) (i) Name the strongest type of intermolecular force in ice.[1] (ii) Draw a fully labelled diagram of two water molecules in ice, showing the force in (i) and how it forms. [5] [3]UCLES 2017 9701/21/M/J/17<br />
(c) The graph represents how the temperature of a sample of copper (melting point 1085 C) changes as it is gradually cooled from 1200 C. PMT 1200 temperature, T / C T1 time / t (i) Identify the state(s) of matter present during each stage of the process shown in the graph. XYZ[2] (ii) State what is happening to the energy and movement of the particles in the copper during stage X.[2] (iii) Explain why the temperature stays constant at T1 during stage Y.[2] [Total: 15]UCLES 2017 9701/21/M/J/17 [Turn over<br />

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9701/21 Question 1(b)(v) Cambridge International AS/A LevelMark Scheme PUBLISHED Answer correct conversions of data to SI/consistent units p = 100 000 ; V = 20106 ; T = 393 calculation of n ( = pVIRT) from M1 values n 10010 2010 -6 8.31393 m = 6.1210460 = 0.0367 (g) calculation of mass m ( = nMr) AND answer correct to 3sf Alternative answer for using C4H10O: m = 6.1210474 = 0.0453 (g) PMT May/June 2017 Marks 1 Question 2(a) substance copper ice silicon(IV) oxide iodine sodium chloride Answer type of bonding metallic type of lattice structure giant/metallic covalent OR hydrogen(-bonding) / H(bonding) hydrogen-bonded / simple / molecular covalent covalent ionic giant (molecular) / macromolecular simple / molecular giant / ionic 2(b)(i) hydrogen bonding Total: 10 Marks 1 1UCLES 2017 Page 3 of 7<br />
9701/21 Question Cambridge International AS/A LevelMark Scheme PUBLISHED Answer 2(b)(ii) H-bond between O and H of different molecules PMT May/June 2017 Marks 1 or minimum three partial charges (in a row) over two H2O molecules, i.e.: either OH+ - - - - O H+ - - - - OH+ lone pair of electrons on O of H-bond, in line with H-bond 2(c)(i) X = liquid AND Z = solid Y = liquid and solid OR liquid / solid OR liquid OR solid 2(c)(ii) (kinetic) energy reducing motion slowing 2(c)(iii) energy given out / released forming bonds / forming bonds exothermic compensates for / counteracts heat loss / cooling owtte owtte Total: 1 1 1 1 1 1 1 15UCLES 2017 Page 4 of 7<br />

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