Edexcel Jun 2017 Paper 2 Q18

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SECTION B Answer ALL the questions. Write your answers in the spaces provided. 18 This is a question about the structure of substances. (a) Predict the H N H bond angle in NH4 + and the H O H bond angle in H3O+. (2) NH4 +H3O+(b) Name the shapes of the BF3 and PH3 molecules and explain why they are different. (4)A E R A S I H T N I E T I R W T O N O D A E R A S I H T N I E T I R W T O N O D A E R A S I H T N I E T I R W T O N O D *P53493A0920* Turn over<br /> *(c) Explain, with reference to the structure and bonding of each substance, why the electrical conductivity of graphite is 1.0105 S m1 but that of diamond is 1.0102 S m1. (4)D O N O T W R I T E I N T H I S A R E A(d) Explain why the Cl Cl bond length is 0.199 nm, but the I I bond length is 0.267 nm. (3)(Total for Question 18 = 13 marks) 10 *P53493A01020* D O N O T W R I T E I N T H I S A R E A D O N O T W R I T E I N T H I S A R E A<br />

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