OCR gateway C3 (yr2006 +) ((C4 on new OCR exam))

revision of chemistry C3 from the 2006 to 2010. (Has now become C4 on new syllabus)

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  • Created by: Gemima
  • Created on: 25-01-12 20:43

Properties of metals

Physical properties:

  • ductile
  • malleable
  • good conductors of heat
  • high melting and boiling points because of strong metalic bonds

Chemical properties:

  • resistance to attack by air or acids

Copper - used in saucepans because...

  • has a high thermal conductivity 
  • has resistance


  • has a low density - used in aircraft
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Conductor and superconductors

Superconductors are materials that conduct electricity with little or no resistance

Meissner effect - when a substance goes from its normal state to a superconducting state, it no longer has a magnetic field

Benefits of a superconductor:

  • loss-free power transmission
  • super-fast electronic circuits
  • powerful electromagnets

Metals conduct electricity because delocalised electrons within its structure can move easily

Superconductors only work at very low temperatures = 20 degrees C

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Transition elements part1

copper compunds are blue

iron (II) compounds are pale green

iron (III) compounds are orange/brown

Transition metals and its compounds are often catalysts

  • iron is used in the Harber process to make ammonia, which is used in fertilisers
  • nickel is used to harden the oils in the manufacture of margarine
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transition elements part 2

sodium hydroxide solution is used to identify the presence of transition metal ions

  • Cu 2+ ions form a blue solid
  • Fe 2+ ions form a grey/green solid
  • Fe 3+ ions form an orange gelatinous solid

These solids are metal hydroxide precipitates

Thermal Decompositions

if a transition metal is heated, it decomposes to form a metal oxide and carbon dioxide 

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