1. Unlocking Potential TechDis Accessibility Essentials 3: Creating Accessible Presentations This presentation on ‘The Born-Haber Cycle’ highlights how complex content can be displayed in a logical user friendly manner. Using annotations and animations. Navigate through the slides sequentially. The Notes section provides textual exemplification of the graphical information.

2. 0 +100 +200 +300 +400 +500 +600 +700 +800 -400 -300 -200 -100 kJ TechDis Accessibility Essentials 3: Creating Accessible Presentations BORN-HABER CYCLE FOR SODIUM CHLORIDE For an ionic compound the lattice enthalpy is the heat energy released when one mole of solid in its standard state is formed from its ions in the gaseous state. This value cannot be determined directly and so we make use of changes for which data are available and link them together with an enthalpy cycle. This enthalpy cycle is based on the formation of the compound from its elements in their standard states.

3. 0 +100 +200 +300 +400 +500 +600 +700 +800 -400 -300 -200 -100 kJ TechDis Accessibility Essentials 3: Creating Accessible Presentations Na (s) + 1/2 Cl 2 (g) Na(g) + 1/2 Cl 2 (g) H= +107kJmol -1 Atomisation of Sodium

4. 0 +100 +200 +300 +400 +500 +600 +700 +800 -400 -300 -200 -100 kJ TechDis Accessibility Essentials 3: Creating Accessible Presentations Na (s) + 1/2 Cl 2 (g) Na(g) + 1/2 Cl 2 (g)0 Na(g) + Cl(g) H = +121kJmol -1 Atomisation of Chlorine

5. 0 +100 +200 +300 +400 +500 +600 +700 +800 -400 -300 -200 -100 kJ TechDis Accessibility Essentials 3: Creating Accessible Presentations + e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- Na (s) + 1/2 Cl 2 (g) Na(g) + 1/2 Cl 2 (g) Na(g) + Cl(g) Na + (g) + Cl(g) H = +502kJmol -1 First Ionisation of Sodium

6. 0 +100 +200 +300 +400 +500 +600 +700 +800 -400 -300 -200 -100 kJ TechDis Accessibility Essentials 3: Creating Accessible Presentations e-e- - Na (s) + 1/2 Cl 2 (g) Na(g) + 1/2 Cl 2 (g) Na(g) + Cl(g) Na(g) + 1/2 Cl 2 (g) Na + (g) + Cl(g) Na + (g) + Cl - (g ) H = -355kJmol -1 First Electron Affinity of Chlorine

7. 0 +100 +200 +300 +400 +500 +600 +700 +800 -400 -300 -200 -100 kJ TechDis Accessibility Essentials 3: Creating Accessible Presentations -- - -- + ++ + Na (s) + 1/2 Cl 2 (g) Na(g) + 1/2 Cl 2 (g) Na(g) + Cl(g) Na(g) + 1/2 Cl 2 (g) Na + (g) + Cl(g) Na + (g) + Cl - (g) NaCl(s) H = -351kJmol -1 Formation of Sodium Chloride

8. 0 +100 +200 +300 +400 +500 +600 +700 +800 -400 -300 -200 -100 kJ TechDis Accessibility Essentials 3: Creating Accessible Presentations -- - -- ++++ Na(g) + 1/2 Cl 2 (g) Na(g) + Cl(g) Na (s) + 1/2 Cl 2 (g) Na(g) + 1/2 Cl 2 (g) Na + (g) + Cl(g) Na + (g) + Cl - (g) NaCl(s) H = -726 kJmol - 1 Lattice Enthalpy for Sodium Chloride