AQA Jun 2015 Paper 5 Q5

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do not write outside the box a table contains data that show a trend in the melting points of some oxides of the period elements table oxide melting point k sodium oxide magnesium aluminium silicon iv phosphorus v sulfur iv oxide oxide oxide oxide oxide a i use data from table to predict an approximate melting point for sodium oxide tick one box mark k k k k a ii explain in terms of structure and bonding why sodium oxide has a high melting point marks wmp jun chem a iii use data from table to predict a value for the melting point of sulfur iv oxide do not write outside the box suggest in terms of structure and bonding why the melting point of sulfur iv oxide is different from that of phosphorus v oxide marks predicted melting point of sulfur iv oxide why the melting point is different from phosphorus v oxide b write an equation for the reaction of sulfur iv oxide with water suggest the ph value of the resulting solution marks equation ph value c silicon iv oxide is insoluble in water explain using an equation why silicon iv oxide is classified as an acidic oxide marks turn over wmp jun chem

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