AQA Jan 2012 Paper 5 Q2

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do not write outside the box consider the following process that represents the melting of ice h o s h o i h kj mol s j k mol a state the meaning of the symbol in h mark b use your knowledge of bonding to explain why h is positive for this process marks c calculate the temperature at which g for this process show your working marks d the freezing of water is an exothermic process give one reason why the temperature of a sample of water can stay at a constant value of oc when it freezes mark e pure ice can look pale blue when illuminated by white light suggest an explanation for this observation marks turn over wmp jan chem

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