Properties of Colloids

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Properties of Colloids : : Basic Chemistry Atoms and Molecules

Colloids :

Colloidal particles may be crystalline or non – crystalline.
When these are dispersed in a liquid, solid or gas they result in formation of a colloidal system, e.g., top soil of earth, protoplasm etc.

  • Sol : When a solid is dispersed in a liquid. The particles of a sol will not settle out.
  • Gel : In a gel the liquid contains a colloidal solid dispersed throughout the system but set in a structure which does not flow, e.g., gelatin, jellies etc.
  • Aerosol : The dispersion of either a solid or a liquid in a gas. When the dispersed colloidal particle is solid, the result is smoke and when it is liquid, the result is fog.
  • Emulsion : When one liquid is dispersed into another in which it is not soluble e.g., Milk, Paint etc.

Properties of Colloids :

  • When the beam of light is passed through a true solution the path of the beam is not visible but when it is passed through a sol its path is visible.
  • This effect is known as Tyndall Effect.

Metallurgy :

  • It comprises the various processes involved in the production of metal from the ore which generally contains a large percentage of rocky material, called gangue or matrise.

Rusting :

  • It is caused in iron due to presence of moisture, oxygen, CO2 in the air.
  • Rusting is prevented by surface coating with Film of Oil, Paint or Metal Coating such as Chromium Coating, Nickel Plating, Tin Plating and Copper Plating.

Alloy :

  • It is a mixture of two or more metals, and small amount of non – metals also.

Ores :

  • These are minerals from which metals are produced.

Minerals :

  • These are the natural materials extracted from the earth that are formed through Geological Processes.
  • Minerals range in composition from pure elements and simple salts to very complex silicates with thousands of known forms.

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