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TechDis Accessibility Essentials 3: Creating Accessible Presentations

This presentation on 'The Born-Haber Cycle' demonstrates how to effectively communicate complex scientific content in a logical and user-friendly manner. Utilizing annotations and animations, the presentation allows for sequential navigation through the slides. The Notes section enhances understanding by providing textual explanations of graphical information. Key concepts include lattice enthalpy, atomization, ionization, and electron affinity associated with sodium chloride. This approach ensures that all learners can engage with the material effectively.

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TechDis Accessibility Essentials 3: Creating Accessible Presentations

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  1. 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. 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. H= +107kJmol-1 Atomisation of Sodium Na(g) + 1/2 Cl2(g) Na(s) + 1/2 Cl2(g)

  4. H = +121kJmol-1 Atomisation of Chlorine Na(g) + Cl(g) Na(g) + 1/2 Cl2(g)0 Na(s) + 1/2 Cl2(g)

  5. H = +502kJmol-1 + First Ionisation of Sodium Na+(g) + Cl(g) e- e- e- e- e- e- e- e- e- e- e- Na(g) + Cl(g) Na(g) + 1/2 Cl2(g) Na(s) + 1/2 Cl2(g)

  6. H = -355kJmol-1 - First Electron Affinity of Chlorine Na+(g) + Cl(g) Na+(g) + Cl-(g) Na(g) + Cl(g) e- Na(g) + 1/2 Cl2(g) Na(g) + 1/2 Cl2(g) Na(g) + 1/2 Cl2(g) Na(s) + 1/2 Cl2(g)

  7. + + + + - - - - - H = -351kJmol-1 Formation of Sodium Chloride Na+(g) + Cl(g) Na+(g) + Cl-(g) Na(g) + Cl(g) Na(g) + 1/2 Cl2(g) Na(g) + 1/2 Cl2(g) Na(g) + 1/2 Cl2(g) Na(s) + 1/2 Cl2(g) NaCl(s)

  8. + + + + - - - - - H = -726kJmol-1 Lattice Enthalpy for Sodium Chloride Na+(g) + Cl(g) Na+(g) + Cl-(g) Na(g) + Cl(g) Na(g) + 1/2 Cl2(g) Na(g) + 1/2 Cl2(g) Na(g) + 1/2 Cl2(g) Na(s) + 1/2 Cl2(g) NaCl(s)

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