CIE Mar 2017 v2 Paper 2 Q1

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Answer all the questions in the spaces provided. (a) The table shows information about some of the elements in the third period. PMT element atomic radius / nm Na 0.186 radius of most common ion / nm 0.095 maximum oxidation number of the element in its compounds Mg 0.160 0.065 Al 0.143 0.050 0.110 0.212 0.104 0.184 Cl 0.099 0.181 +7 +1 (i) Complete the table to show the maximum oxidation number of each element in its compounds. [1] (ii) Explain why the atomic radius of elements in the third period decreases from Na to Cl.[3] (iii) The radius of the most common ion of Mg is much smaller than the radius of the most common ion of S. Identify both ions and explain the difference in their radii.[2]UCLES 2017 9701/22/F/M/17<br /> (b) Phosphorus is a non-metal in the third period. It reacts vigorously with excess oxygen but slowly with chlorine. PMT Some reactions of phosphorus are shown. phosphorus excess O2(g) reaction 1 A(s) Cl 2(g) reaction 2 PCl 5(s) water B(aq) + HCl (aq) (i) Write an equation to represent reaction 1, the formation of compound A.[1] (ii) Give two observations you could make in reaction 2. 1.2.[2] (iii) Name compound B.[1]UCLES 2017 9701/22/F/M/17 [Turn over<br /> (c) Cerium is a lanthanoid metal that shows similar chemical reactions to some elements in the third period. Most of ceriums compounds contain Ce3+ or Ce4+ ions. (i) Cerium shows the same structure and bonding as a typical metal. Draw a labelled diagram to show the structure and bonding in cerium. PMT (ii) Cerium(IV) oxide, CeO2, is a ceramic. Suggest two physical properties of cerium(IV) oxide. 1.2.[2] [2]UCLES 2017 9701/22/F/M/17<br /> PMT (iii) A naturally occurring sample of cerium contains only four isotopes. Data for three of the isotopes are shown in the table. isotope relative isotopic mass percentage abundance 136Ce 138Ce 140Ce 135.907 137.906 139.905 0.185 0.251 88.450 142Ce to be calculated to be calculated The Ar of the sample is 140.116. Use these data to calculate the relative isotopic mass of the fourth isotope in this sample of cerium. Give your answer to three decimal places. relative isotopic mass =[3] [Total: 17]UCLES 2017 9701/22/F/M/17 [Turn over<br />

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