2 marksStructure and Bonding

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

Glass is a non-crystalline solid that melts over a wide temperature range, primarily composed of silicates (SiO₂). The chemical bonds within the SiO₂ tetrahedron vary in strength.

Why is it important that glass does NOT crystallize as it cools?

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6(a)(i)State TWO benefits of adding sodium carbonate or calcium carbonate to silica in the manufacture of glass.[2 marks]
6(a)(ii)State how the basic components of glass are modified to produce lead-potassium glass borosilicate glass.[4 marks]
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]
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]
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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