NATIONAL 5 CHEMISTRY UNIT 3 CHEMISTRY IN SOCIETY

NATIONAL 5 CHEMISTRY UNIT 3 CHEMISTRY IN SOCIETY

1. METALS

   • Free electrons which is also called DELOCALISED
   • Alloy
     • An alloy is a mixture of a metal with at least one other element
     • Making an alloy changes the properties of the metal
   • Extraction of metals from ores
     • Heat
     • Heat and Carbon
     • Electrolysis
       • OPPOSITES ALWAYS ATTRACT

2. OIL RIG

   • OXIDATION IS LOSS
   • REDUCTION IS GAIN

3. PERCENTAGE MASS CALCULATIONS

   • calculate the gram formula mass
   • then its regular percentage calculations

4. BATTERIES / CELLS

   • Simple Cell
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     • Sugar solution cannot be used as it is a covalent so will not conduct
   • Half Cells
     • Cells can also be set up by connecting two half cells together
     • A half cell consists of a metal in a solution of its own ions
     • INSERT IMAGE HERE
   • Rechargeable Batteries
     • Normal batteries go out of charge because the chemicals inside have been used up.
       • With rechargeable batteries the radox is reversable
     • Passing an electrical current through the battery forces the radox reaction into reverse
   • Fuel Cells
     • With a fuel cell chemicals constantly flow into the cell so it will never go flat
       • As long as the chemicals flow into the cell the electricity flows out of the cell
     • No Carbon Dioxide is produced so no pollution is created
     • Fuel cells need a source of hydrogen - obtained by electrolysis of water - and of oxygen - obtained from the air

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