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Lattice energy and Born-Haber cycles (Chemical Energetics #4)
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LESSON OBJECTIVE: Understand the concept of electron affinity and use Born-Haber cycles to calculate lattice energies
Download the slides and student led tasks for this lesson here:
Learning Outcomes:
(taken from the Cambridge International AS and A Level Chemistry curriculum)
23.1 Lattice energy and Born-Haber cycles
(a) enthalpy change of atomisation, ΔHat
(b) lattice energy, ΔHlatt (the change from gas phase ions to solid lattice)
2. (a) define and use the term first electron affinity, EA
(b) explain the factors affecting the electron affinities of elements
(c) describe and explain the trends in the electron affinities of the Group 16 and Group 17 elements
3. construct and use Born–Haber cycles for ionic solids (limited to +1 and +2 cations, –1 and –2 anions)
4. carry out calculations involving Born–Haber cycles
5. explain, in qualitative terms, the effect of ionic charge and of ionic radius on the numerical magnitude of a lattice energy
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