AQA Jun 2011 Paper 2 Q2

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do not write outside the box this question is about the extraction of titanium from titanium iv oxide by a two stage process the first stage in the process produces titanium iv chloride in the second stage titanium iv chloride is converted into titanium the enthalpy change for the second stage can be determined using hess s law a give one reason why titanium is not extracted directly from titanium iv oxide using carbon mark b give the meaning of the term enthalpy change mark c state hess s law mark d define the term standard enthalpy of formation marks wmp jun chem do not write outside the box e the following standard enthalpy of formation data refer to the second stage in the extraction of titanium ticl g na i nacl s ti s hf kj mol e i state why the value for the standard enthalpy of formation of na i is not zero mark e ii use data from the table to calculate a value for the standard enthalpy change of the following reaction ticl g na i nacl s ti s marks e iii state the role of sodium in this reaction mark turn over wmp jun chem

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