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Glass Aims: describe how sodium carbonate is used to make glass

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Presentation on theme: "Glass Aims: describe how sodium carbonate is used to make glass"— Presentation transcript:

1 Glass Aims: describe how sodium carbonate is used to make glass
describe the role of transition metals and sodium carbonate in making glass describe aspects of safety, sustainability and effects on the environment of glass

2 Have you ever wandered? How is glass made and coloured?
What are the problems of using glass?

3 Raw Materials Sand (silicon dioxide) But this melts at 2000oc so..
Sodium carbonate is added This lowers the melting point to 1000oc, but… This is very weak and can dissolve in water so… Calcium oxide (lime) is also added

4 Other types of glass Crystal Plus potassium oxide an lead oxide
Refracts light differently

5 Pyrex Boron Low expansion rate so less cracks form

6 Other types Fibre glass – loft insulation Glass ceramic – cooker tops
Crown glass – lenses

7 What are the most abundant elements on Earth?
Oxygen Silicon Aluminium Iron Calcium Sodium Potassium Magnesium Titanium Hydrogen

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