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Chemistry Level 2

Chemistry Level 2. Giant covalent structures and nanomaterials. Giant covalent structures - 1. Diamond and graphite are forms of carbon with giant covalent structures. Fullerenes are another form of carbon used to form nanotubes. Giant covalent structures - 2.

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Chemistry Level 2

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  1. Chemistry Level 2 Giant covalent structures and nanomaterials

  2. Giant covalent structures - 1 • Diamond and graphite are forms of carbon with giant covalent structures. • Fullerenes are another form of carbon used to form nanotubes.

  3. Giant covalent structures - 2 • Thermosoftening polymers do not have cross links between chains. • They canbe melted. • So they can be recycled

  4. Giant covalent structures - 3 • Thermosetting plastics have long chains with cross-links • This holds the chains in place and makes the plastic rigid – so they can’t be recycled

  5. Nanoparticles • Fullerenes are examples of nanoparticles • Nanoparticles are made up of a few hundred atoms • They measure between one nanometre and 100 nanometres across

  6. Nanoparticles are useful • Nanotubes have very large surface areas compared with their volumes so make excellent catalysts • Nanotubescan be used to reinforce tennis rackets because they are so strong and stiff, yet light • Fullerene cages can deliver dangerous drugs to the site of a tumour or infection • Nanoparticles are being used for self-cleaning ovens and windows

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