AQA Jan 2012 Paper 1 Q1

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section a answer all questions in the spaces provided do not write outside the box a fluorine forms compounds with many other elements fluorine reacts with bromine to form liquid bromine trifluoride brf state the type of bond between br and f in brf and state how this bond is formed type of bond how bond is formed marks b two molecules of brf react to form ions as shown by the following equation brf brf brf b i draw the shape of brf and predict its bond angle include any lone pairs of electrons that influence the shape shape of brf bond angle marks b ii draw the shape of brf and predict its bond angle include any lone pairs of electrons that influence the shape shape of brf bond angle marks wmp jan chem do not write outside the box c ions are also formed when potassium fluoride dissolves in liquid brf to form brf kbrf explain in terms of bonding why kbrf has a high melting point marks extra space d fluorine reacts with hydrogen to form hydrogen fluoride hf d i state the strongest type of intermolecular force between hydrogen fluoride molecules mark d ii draw a diagram to show how two molecules of hydrogen fluoride are attracted to each other by the type of intermolecular force that you stated in part d i include all partial charges and all lone pairs of electrons in your diagram e the boiling points of fluorine and hydrogen fluoride are oc and oc respectively explain in terms of bonding why the boiling point of fluorine is very low marks marks extra space turn over wmp jan chem

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