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. The Case of a Liquid Solute Dissolved in a Liquid Solvent
Show Notes
2. 11. Metals Usually Have a Silver or Grey Colour
Show Notes
8. 3. Non-Metals are Bad Conductors of Heat and Electricity.
Show Notes
9. 7. Non-Metals may be Solid, Liquid or Gases at the Room Temperature.
Show Notes
10. 1. Separation by a Suitable Solvent
Show Notes
12. To Study the Properties of a Colloid
Show Notes
15. To Separate a Mixture of Alcohol and Water
Show Notes
16. 6. Metals are Usually Strong. They Have High Tensile Strength.
Show Notes
18. To Study the Properties of a Solution
Show Notes
20. 3. Metals are Good Conductors of Heat and Electricity.
Show Notes
23. Separation Of Mixture Of a Solid And a Liquids
Show Notes
25. Chemical Formula for daily use material
Show Notes
28. To Study the Properties of a Compound of Iron and Sulphur
Show Notes
32. 6. Non-Metals are Not Strong. They Have Low Tensile Strength.
Show Notes
34. 4. Metals are Lustrous (or Shiny), and can be Polished.
Show Notes
37. 7. Metals are Solids at the Room Temperature
Show Notes
41. To Separate the Salt-Water Mixture (or Salt-Solution)
Show Notes
43. Separation of Mixture Of Two Solids
Show Notes
46. 11. Non-Metals Have Many Different Colours.
Show Notes
