CH 144 ELEMENTS FROM EARTH

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CH 14-4 ELEMENTS FROM EARTH

• STANDARD 3- THE STRUCTURE OF MATTER

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GOLD AND DENSITY

• Golds density is 19.3 g/cm3
• The high density of gold can be used to separate
  it from any surrounding material.

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B. COPPER AND ELECTROLYSIS

• Copper exists as a compound in nature and has to
  be separated from it.
• A rock that contains a useful material is an ore
• In order to extract copper from ore it is
  necessary to use its chemical activity.
• Passing an electric current through a solution of
  copper compound separates

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B. COPPER AND ELECTROLYSIS

• the copper from the rest.
• 5. This is called electrolysis.
• 6. Each end of a wire is called an electrode.
• 7. Copper collects on one and the rest collects
  on the other.

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C. IRON AND CHEMICAL ACTIVITY

• When heated, the carbon reacts with oxygen in the
  ore, leaving behind the purified iron.
• The carbon comes from a material called coke.
• 3. Today, you can observe these processes in
  huge blast furnaces.