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Bonding & Structure

Bonding & Structure. K Warne. AFTER WORKING THROUGH THIS PRESENTATION YOU SHOULD BE ABLE TO CLASSIFY THE SOLIDS BELOW ACCORDING TO THE TYPES OF STRUCTURE GIVEN IN THIS TABLE: IODINE SALT IRON CARBON (DIAMOND & GRAPHITE) ICE GLASS/SAND (SILICON DIOXIDE)

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Bonding & Structure

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  1. Bonding & Structure K Warne

  2. AFTER WORKING THROUGH THIS PRESENTATION YOU SHOULD BE ABLE TO CLASSIFY THE SOLIDS BELOW ACCORDING TO THE TYPES OF STRUCTURE GIVEN IN THIS TABLE: • IODINE • SALT • IRON • CARBON (DIAMOND & GRAPHITE) • ICE • GLASS/SAND (SILICON DIOXIDE) • IF YOU UNDERSTAND THE CONTENT YOU SHOULD BE ABLE TO PREDICT THE BONDING AND STRUCTURE IN: • PLASTIC • SUGAR • BICARBONATE OF SODA

  3. Giant Molecules - Network solids Strong covalent bonds • Network solids have strong bonds between all atoms. • The structure is extended in three dimensions. • Extensive bonding and a GIANT STRUCTURE ensure the substance has high boiling and melting points are insoluble, electrons are held in bonds and generally not free to conduct electricity.

  4. Network Solids Strong covalent bonds Diamond Graphite Delocalised electrons - Weaker van der waalsforces between the layers Diamond Graphite - conducts electricity as the delocalised electrons are free to move.

  5. Molecular solids SIMPLE MOLECULAR STRUCTURES Strong covalent bonds Iodine Ice Weaker intermolecular bonds

  6. Microscopy FURTHER READING: Investigate how the structure of molecules is determined from x-ray diffraction patterns.

  7. Metals Strong electromagnetic attraction between ions and ‘sea’ of delocalised electrons. GIANT structure – extensive strong bonding in 3 dimensions and extended structure High melting points & boiling points, good conductors of electricity, insoluble (Delocalised electrons)

  8. Ionic Solids Ionic bonds An extended lattice (Regular 3D arrangement) ofpositiveandnegativeions. Strong bonding throughout ensures the structure has VERY high melting points but is soluble in polar solvents and conduct electricity when dissolved or in liquid form.

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