Edexcel Jun 2016 (IAL) Paper 2 Q (with explained solutions) |

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Edexcel Jun 2016 (IAL) Paper 2 Q

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SECTION B Answer ALL the questions. Write your answers in the spaces provided. 13 This question is about three chlorine compounds: BCl3, NCl3 and Cl2O7. (a) For BCl3, give the shape of the molecule and give the ClBCl bond angle. (2) ShapeBond angle*(b) For the NCl3 molecule, draw the shape you would expect, and suggest the ClNCl bond angle. Explain why the molecule has this shape and bond angle. Shape (4) Bond angleExplanation(c) (i) What is the oxidation number of chlorine in Cl2O7? (1)10 *P46659A01024*<br />
(ii) One oxygen atom bonds to both chlorine atoms in Cl2O7. Suggest a displayed formula for Cl2O7. (iii) Water reacts with Cl2O7 to form a single product. Suggest the equation for this reaction. State symbols are not required. (1) (1) (Total for Question 13 = 9 marks) *P46659A01124* 11 Turn over<br />

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Mark (2) Acceptable Answers Reject Ignore drawn shapes Shape is trigonal planar/ triangular planar Allow recognisable spelling eg triganol planar (1) Bond angle 120(o) Stand alone mark (1) No TE on incorrect shape Answers may be given the wrong way round ie bond angle first, then shape pyramidal Just planar OR Trigonal OR Triangular oC Section B Question Number 13(a)<br />
Question Number *13(b) Acceptable Answers (Shape) Ignore references to tetrahedral/pyramidal ALLOW N Cl Cl ClN Cl Cl Cl N / I Cl Cl Cl Lone pair on central N atom NOT required ALLOW Any correct variation as long as the shape is clear (1) Any angle between 106(o)108(o) (1) Mark M1 and M2 independently (Explanation) Minimum repulsion (between pairs/groups of electrons /centre of of electron density) ALLOW maximum separation (1) (between pairs/groups of electrons /centre electron density) Lone pair-bond pair repulsions are greater /more than bond pair-bond pair repulsions OR Lone pair(s) repel more than bond pair(s) (1) Mark (4) Reject No M1 if incorrect name for shape eg bipyramidal Just dot and cross TWO lone pairs OC between atoms/ bonds between atoms/ bonds <br />
Question Number 13(c)(i) Question Number 13(c)(ii) Correct Answer +7 / +VII ALLOW 7+ / 7+ Correct Answer Reject 7, -7 Reject Mark (1) Mark (1) ALLOW O O | | OClOCl - O | | O O OR O OOClOClOO O IGNORE Any dot and cross diagram or added dots and crosses Question Number 13(c)(iii) Cl2O7 + H2O2HClO4 Correct Answer Reject Mark (1) Ignore state symbols even if incorrect. Atoms can be in any order. ALLOW H2Cl2O8 ALLOW multiples (Total for Question 13 = 9 marks)<br />

Question 13 14 15 16

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