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4. Answer ALL parts. (a) Describe, in detail, three properties of metals and how these properties change when the size o
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4. Answer ALL parts. (a) Describe, in detail, three properties of metals and how these properties change when the size of the metal particle is reduced to the nanoscale. [15 marks] (b) Describe the effect of processing conditions on sol-gel synthesis and the difference in the products formed. [15 marks] (c) Explain, using diagrams, how Titanium Dioxide can operate as a semiconductor photocatalyst. [10 marks)