AQA Jun 2011 Paper 1 Q3

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do not write outside the box fluorine and iodine are elements in group of the periodic table a explain why iodine has a higher melting point than fluorine marks extra space b i draw the shape of the nhf molecule and the shape of the bf molecule include any lone pairs of electrons that influence the shape in each case name the shape shape of nhf shape of bf name of shape of nhf name of shape of bf marks b ii suggest a value for the f n f bond angle in nhf mark c state the strongest type of intermolecular force in a sample of nhf mark wmp jun chem do not write outside the box d a molecule of nhf reacts with a molecule of bf as shown in the following equation nhf bf f hnbf state the type of bond formed between the n atom and the b atom in f hnbf explain how this bond is formed name of type of bond how bond is formed marks turn over for the next question turn over wmp jun chem do not write outside the box there are several types of crystal structure and bonding shown by elements and compounds a i name the type of bonding in the element sodium mark a ii use your knowledge of structure and bonding to draw a diagram that shows how the particles are arranged in a crystal of sodium you should identify the particles and show a minimum of six particles in a two dimensional diagram b sodium reacts with chlorine to form sodium chloride b i name the type of bonding in sodium chloride mark b ii explain why the melting point of sodium chloride is high marks marks extra space wmp jun chem

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