AQA June /3 A-level CHEMISTRY Paper 3

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A-level
CHEMISTRY
Paper 3

Time allowed: 2 hours
Materials
For this paper you must have: For Examiner’s Use
 the Periodic Table/Data Booklet, provided as an insert (enclosed)
 a ruler with millimetre measurements Question Mark
 a scientific calculator, which you are expected to use where appropriate. 1
2
Instructions 3
 Use black ink or black ball-point pen.
4
 Fill in the boxes at the top of this page.
 Answer all questions. 5
 You must answer the questions in the spaces provided. Do not Section
write outside the box around each page or on blank pages. B
 If you need extra space for your answer(s), use the lined pages at TOTAL
the end of this book. Write the question number against your
answer(s).
 All working must be shown.
 Do all rough work in this book. Cross through any work
you do not want to be marked.

Information
 The marks for questions are shown in brackets.
 The maximum mark for this paper is 90.

Advice
 You are advised to spend 70 minutes on Section A and 50 minutes on Section B.




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Answer all questions in this
section.


0 1 for enthalpy of solution can be determined in two ways:
A value

 from a cycle, using lattice enthalpy and enthalpies of hydration
 from the results of a calorimetry experiment.

0 1 .1 Define the term enthalpy of lattice
dissociation. [2 marks]




0 1 .2 The enthalpy of solution for ammonium nitrate is the enthalpy change for
the reaction shown.

NH4NO3(s) + aq → NH4(aq) + NO3 (aq) H = +26 kJ mol1

Table 1

 
NH4 (g) NO3 (g)

Enthalpy of hydration H / kJ mol
hyd
1 307 314


Draw a suitably labelled cycle and use it, with data from Table 1, to
calculate the enthalpy of lattice dissociation for ammonium nitrate.
[3 marks]




Enthalpy of lattice dissociation kJ mol1




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