AQA Jun 2015 Paper 2 Q9

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do not write outside the box vanadium is an important metal ferrovanadium an alloy of iron and vanadium is used to make a strong type of vanadium steel pure vanadium is used in nuclear reactors a table shows some standard enthalpy of formation data table v o s cao s hf kj mol in the oldest method of extraction of vanadium v o is reacted with calcium at a high temperature ca s v o s v s cao s use data from table and the equation to calculate the standard enthalpy change for this reaction state the type of reaction that v o has undergone suggest one major reason why this method of extracting vanadium is expensive other than the cost of heating the reaction mixture marks question continues on the next page turn over wmp jun chem do not write outside the box b ferrovanadium is produced by the reaction of aluminium with a mixture of v o and iron iii oxide write an equation for the reaction of aluminium with iron iii oxide state the change in oxidation state of aluminium in this reaction marks c pure vanadium for nuclear reactors is formed by the reaction of hydrogen with purified vcl write an equation for this reaction in which the only other product is hcl gas identify two hazards in this process other than the fact that it operates at a high temperature deduce why this process produces pure vanadium other than the fact that purified vcl is used marks copyright aqa and its licensors all rights reserved end of questions wmp jun chem

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