AQA Jun 2010 Paper 5 Q2

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do not write outside the box sodium aluminium and silicon are solid elements with a silver colour these elements react with oxygen to form oxides with high melting points aluminium is a reactive metal but it resists corrosion in water because it has a surface coating of aluminium oxide a in terms of its structure and bonding explain why silicon dioxide has a high melting point marks extra space b state the type of bonding in aluminium oxide mark c write an equation for the reaction of aluminium with oxygen mark d suggest one property of the aluminium oxide coating that causes aluminium to resist corrosion in water mark e sodium metal is not resistant to corrosion in water despite having a surface coating of sodium oxide write an equation to show how sodium oxide reacts with water mark wmp jun chem do not write outside the box f aluminium oxide is amphoteric it reacts with acids and alkalis f i write an equation for the reaction between aluminium oxide and hydrochloric acid mark f ii write an equation for the reaction between aluminium oxide and an excess of aqueous sodium hydroxide mark g silicon dioxide does not react with hydrochloric acid but it does react with sodium hydroxide state one property of silicon dioxide that can be deduced from this information and write an equation for its reaction with sodium hydroxide property equation marks turn over for the next question turn over wmp jun chem

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