AQA Jun 2011 Paper 5 Q1 (with explained solutions) |

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AQA Jun 2011 Paper 5 Q1

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section a answer all questions in the spaces provided do not write outside the box thermodynamics can be used to investigate the changes that occur when substances such as calcium fluoride dissolve in water a give the meaning of each of the following terms a i enthalpy of lattice formation for calcium fluoride marks a ii enthalpy of hydration for fluoride ions mark b explain the interactions between water molecules and fluoride ions when the fluoride ions become hydrated marks wmp jun chem do not write outside the box c consider the following data enthalpy of lattice formation for caf enthalpy of hydration for ca ions enthalpy of hydration for f ions h kj mol use these data to calculate a value for the enthalpy of solution for caf marks turn over for the next question turn over wmp jun chem there are no questions printed on this page do not write on this page answer in the spaces provided wmp jun chem

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question a i a ii b mark scheme general certificate of education a level chemistry unit energetics redox and inorganic chemistry june marking guidance mark comments enthalpy change for formation of mol of caf from its ions ions in the gaseous state enthalpy change when mol of gaseous fluoride ions is converted into aqueous ions an aqueous solution water is polar h on water is is electron deficient is unshielded f ions attract water on h hydrogen caf scores m and m allow heat energy change do not allow energy or wrong formula for caf penalise mol of ions ce if atoms or elements or molecules mentioned ignore conditions ions can be mentioned in m to score in m allow fluorine ions ca g f g allow f g do not penalise energy instead of enthalpy allow fluorine ions do not allow f ions surrounded by water penalise h on water mark allow h on water forms h bonds with f allow fluorine ions penalise co ordinate bonds for m penalise attraction to o for m f aq ignore aq mark scheme general certificate of education a level chemistry unit energetics redox and inorganic chemistry june c h kj mol ignore cycles m is for numbers and signs correct in expression correct answer scores ignore units even if incorrect

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Topics to revise

AQA > Physical chemistry > Thermodynamics >

5 Gibb’s Free Energy

AQA > Physical chemistry > Thermodynamics >

2 Born-Haber cycle

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4 Electronic arrangement

AQA > Physical chemistry > Amount of substance AS >

1 The mole and Avogadro’s constant

AQA > Inorganic chemistry > Transition metals >

6 Shape of complex ions

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