AQA Jun 2017 Paper 1 Q1

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0 1 0 1 . 1 0 1 . 2 *02*Answer all questions in the spaces provided This question is about silver iodide. Define the term enthalpy of lattice formation. [2 marks] Some enthalpy change data are shown in Table 1. Table 1 Enthalpy change / kJ mol1 AgI(s)Ag+(aq) + I(aq) Ag+(g)Ag+(aq) I(g)I(aq) +112 464 293 Use the data in Table 1 to calculate the enthalpy of lattice formation of silver iodide. [2 marks] Enthalpy of lattice formation kJ mol1 IB/M/Jun17/7405/1<br /> 0 1 . 3 A calculation of the enthalpy of lattice formation of silver iodide based on a perfect ionic model gives a smaller numerical value than the value calculated in Question 1.2 Explain this difference. [2 marks] 0 1 . 4 Identify a reagent that could be used to indicate the presence of iodide ions in an aqueous solution and describe the observation made. [2 marks] Reagent Observation Turn over for the next question *03* Turn overIB/M/Jun17/7405/1<br />

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