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
2. 7. Metals are Solids at the Room Temperature
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5. 3. Non-Metals are Bad Conductors of Heat and Electricity.
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8. 11. Non-Metals Have Many Different Colours.
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9. 7. Non-Metals may be Solid, Liquid or Gases at the Room Temperature.
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15. 8. Metals Generally Have High Melting Points and Boiling Points.
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19. 8. Non-Metals Have Comparatively Low Melting Points and Boiling Points
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23. 1. Non-Metals are Not Malleable. Non-Metals are Brittle.
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24. To Study the Properties of a Suspension
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25. Effect of Temperature and Pressure on Solubility
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26. Chemical Formula for daily use material
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27. Pure Substances : Elements and Compounds
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33. 1. Separation by a Suitable Solvent
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34. Solutions, Suspensions And Colloids
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37. 4. Non-Metals are Not Lustrous (Not Shiny). They are Dull in Appearance.
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41. 3. Metals are Good Conductors of Heat and Electricity.
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50. Separation Of Mixture Of a Solid And a Liquids
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