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CONDUCTORS AND NON-CONDUCTORS

CONDUCTORS AND NON-CONDUCTORS 

All metals (copper, iron, lead, magnesium etc) and graphite, a non-metal. Most non-metals (sulphur, iodine, charcoal etc.) Most solid compounds (All gases are non-conductors)

 

Liquids are classified in three groups as regards their conductivity of electricity:

(i) Those that pass an electric current and are not decomposed by if (conductors)

(ii) Those that pass an electric current and are decomposed by it (electrolytes)

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(iii) Those that do not pass an electric current (non-electrolytes).

 

In summary, the following substances are electrolytes:

  • Molten salts
  • Solutions of salts in water
  • Solutions of acids
  • Solutions of alkalis

 

Metallic conductivity:

  • Electrons flow(carry charge)
  • It is a property of elements, graphite and alloys
  • It takes place in solids and liquids
  • No chemical change takes place.
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Electrolytic conductivity:

  • Ions flow (carry charge)
  • It is a property of ionic compounds
  • Takes place in liquids (molten salts) and solutions but not solids
  • Chemical decomposition takes place.

 

See also

SIMPLE MACHINE

AIR AND COMBUSTION

AN ALKALI

BASES AND INDICATORS

EVAPORATION AND BOILING

 

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