To Distinguish a Colloid from a Solution
We can distinguish between colloids (or colloidal solutions) and true solutions by using Tyndall effect as follows :
(i)The solution which scatters a beam of light passing through it and renders its path visible, will be a colloid (or colloidal solution).
(ii) The solution which does not scatter a beam of light passing through it and does not render its path visible, will be a true solution.
For example, a soap solution scatters a beam of light passing through it and renders its path visible therefore, soap solution is a colloid (or colloidal solution). On the other hand, a salt solution does not scatter a beam of light passing through it and does not render its path visible, therefore, salt solution is a true solution.
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Matter in Our Surroundings - Notes
2. 7. Metals are Solids at the Room Temperature
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4. 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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16. 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. To Study the Properties of a Suspension
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24. Effect of Temperature and Pressure on Solubility
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25. Chemical Formula for daily use material
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26. 1. Non-Metals are Not Malleable. Non-Metals are Brittle.
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32. Pure Substances : Elements and Compounds
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33. 3. Metals are Good Conductors of Heat and Electricity.
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34. 4. Non-Metals are Not Lustrous (Not Shiny). They are Dull in Appearance.
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37. 1. Separation by a Suitable Solvent
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38. Solutions, Suspensions And Colloids
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46. Differences Between Mixtures and Compounds
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48. Separation Of Mixture Of a Solid And a Liquids
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50. To Separate the Salt-Water Mixture (or Salt-Solution)
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