Edexcel Jun 2016 Paper 2 Q13

Answers available below

SECTION B Answer ALL the questions. Write your answers in the spaces provided. 13 This question is about the fluorides BF3, NF3, OF2 and O2F2. (a) (i) For BF3, name the shape of the molecule and give the FBF bond angle. (2) ShapeBond angle*(ii) For the NF3 molecule, draw the shape you would expect and suggest the FNF bond angle. Explain why the molecule has this shape and bond angle. Shape D O N O T W R I T E I N T H I S A R E A (4) D O N O T W R I T E I Bond angleExplanationN T H I S A R E A(iii) Draw a diagram to show the bonding in the single product of the reaction between BF3 and NF3. Identify the type of bond that forms between these two molecules. (2)10 *P46658A01024* D O N O T W R I T E I N T H I S A R E A<br /> (b) (i) What is the oxidation number of oxygen in OF2? (1)(ii) When water reacts with OF2, oxygen is one of the products. Suggest an equation for this reaction. State symbols are not required. (c) Complete the diagram with dots and crosses to show the outer shell electrons in the O2F2 molecule. (1) (1) 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 (Total for Question 13 = 11 marks) A E R A S I H T N I E T I R W T O N O D *P46658A01124* 11 Turn over<br />

Show answer