Properties of Colloids
The important characteristic properties of colloids (or colloidal solutions) are as follows :
1.A colloid (or colloidal solution) appears to be homogeneous but actually it is heterogeneous.
2.The size of particles in a colloid (or colloidal solution) is bigger than those in a true solution but smaller than those in a suspension. It is between 1 nm and 100 nm in diameter.
3.The particles of most of the colloids (or colloidal solutions) cannot be seen even with a microscope.
4.The particles of a colloid (or colloidal solution) can pass through a filter paper. So, a colloid cannot be separated by filtration.
5.The colloids (or colloidal solutions) are quite stable. The particles of a colloid do not separate out on keeping.
6.A colloid (or colloidal solution) scatters a beam of light passing through it (because its particles are fairly large).
Though colloids cannot be separated by the process of filtration, but a special technique known as centrifugation can be used to separate the colloidal particles from a colloidal solution.
Notes
Matter in Our Surroundings - Notes
1. 11. Metals Usually Have a Silver or Grey Colour
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2. The Case of a Liquid Solute Dissolved in a Liquid Solvent
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8. 7. Non-Metals may be Solid, Liquid or Gases at the Room Temperature.
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9. 3. Non-Metals are Bad Conductors of Heat and Electricity.
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10. 1. Separation by a Suitable Solvent
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13. 6. Metals are Usually Strong. They Have High Tensile Strength.
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16. To Separate a Mixture of Alcohol and Water
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18. Chemical Formula for daily use material
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19. To Study the Properties of a Colloid
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22. 3. Metals are Good Conductors of Heat and Electricity.
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25. To Study the Properties of a Compound of Iron and Sulphur
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30. 4. Metals are Lustrous (or Shiny), and can be Polished.
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33. To Study the Properties of a Solution
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35. To Separate the Salt-Water Mixture (or Salt-Solution)
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38. 7. Metals are Solids at the Room Temperature
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39. To Study the Properties of a Suspension
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41. 8. Non-Metals Have Comparatively Low Melting Points and Boiling Points
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45. Separation of Mixture Of Two Solids
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46. Separation Of Mixture Of a Solid And a Liquids
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49. Experiment to Obtain Coloured Component (Dye) From Ink
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