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2 marksNon-Metals

CSEC Chemistry · May/June 2008 · Paper 2 · Question 6(a)(i)

Glass is manufactured by strongly heating a mixture of silica, sodium carbonate, and calcium carbonate, which forms a transparent liquid that becomes glass upon cooling. Different glass types are made by varying reactant proportions and adding other substances.

State TWO benefits of adding sodium carbonate or calcium carbonate to silica in the manufacture of glass.

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Other parts of this question

  1. 6(a)(ii)State how the basic components of glass are modified to produce lead-potassium glass borosilicate glass.[4 marks]
  2. 6(b)(i)Why is it important that glass does NOT crystallize as it cools?[2 marks]
  3. 6(b)(ii)Suggest how the bonding in SiO₂ affects what happens when glass melts. Explain why this is important for blowing and moulding glass.[3 marks]
  4. 6(b)(iii)Although no scarce and vital raw material is used in the manufacture of glass, recycling of glass is strongly recommended. Suggest TWO reasons for this.[2 marks]
  5. 6(b)(iv)Glass is now widely used as a construction material in buildings. State ONE advantage and ONE disadvantage of using glass in this way.[2 marks]

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