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CONDUCTORS AND INSULATORS  The ability to conduct electricity is the major simple distinction between elements that are metals and non-metals.   Electrical Conductors A conductor is a material that conducts electricity but is not chemically changed in the process. They carry an electric current through freely moving electrons when a potential difference is applied across them. They include: All metals (molten or solid) and the non-metal carbon (graphite). This conduction involves the movement of free or delocalized electrons (e- charged particles) and does not involve any chemical change. Any molten or dissolved material in which the liquid contains free moving ions is called the electrolyte. Ions are charged particles eg Na+ sodium ion, or Cl- chloride ion, and their movement or flow constitutes an electric current, because a current is moving charged particles. All metals and graphite are conductors of electricity.   Insulators An insulator is a material that does… Read More »CONDUCTORS AND INSULATORS



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) (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.   Electrolytic conductivity: Ions flow (carry charge) It is a property of ionic compounds Takes place in liquids (molten salts) and solutions but not solids… Read More »CONDUCTORS AND NON-CONDUCTORS

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