Edexcel Jun 2017 Paper 1 Q22

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22 (a) The table below shows the experimental and calculated values for the lattice energy of sodium chloride and silver chloride. Compound sodium chloride silver chloride Lattice Energy / kJ mol1 Experimental Calculated 780 905 770 833 (i) Write the equation for the lattice energy of sodium chloride. Include state symbols. (1) (ii) Name the energy cycle used to calculate lattice energies from experimental data. (1)*(iii) Explain fully why the experimental and calculated values for the lattice energy of sodium chloride are similar, whereas those for silver chloride differ significantly. (3)24 *P53491A02432* D O N O T W R I T E I N T H I S A R E A D O N O T W R I T E I N T H I S A R E A D O N O T W R I T E I N T H I S A R E A<br /> (b) The percentage composition by mass of a sodium compound is Na = 29.1%; S = 40.6%; O = 30.3%. Calculate the empirical formula of the compound. (c) Draw the dot and cross diagram for sodium oxide. Show the outer electrons only. (3) (2) A E R A S I H T N I E T I R W T O N O D A E R A S I H T N I E T I R W T O N O D A E R A S I H T N I E T I R W T O N O D *P53491A02532* 25 Turn over (Total for Question 22 = 10 marks)<br />

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