CIE Nov 2017 v2 Paper 2 Q1

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Answer all the questions in the spaces provided. PMT The elements sodium to sulfur react with chlorine. The melting points of some of the chlorides formed are shown. chloride melting point / K NaCl 1074 MgCl 2 987 Al Cl 3 463 SiCl 4 203 PCl 3 161 SCl 2 195 (a) Predict the shapes of Al Cl 3 and PCl 3. Draw diagrams to show the shapes, name the shapes and state the bond angles. Al Cl 3 PCl 3 shapeshapeangleangle[4] (b) (i) Explain, in terms of structure and bonding, why the melting point of SiCl 4 is much lower than that of NaCl.[3] (ii) Explain why the melting point of SiCl 4 is higher than that of PCl 3.[2]UCLES 2017 9701/22/O/N/17<br /> (iii) Draw the dot-and-cross diagram of a molecule of SiCl 4. Show outer electrons only. PMT [1] [Total: 10]UCLES 2017 9701/22/O/N/17 [Turn over<br />

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