Is Matter Around Us Pure
If we observe some sugar and some soil (mitti) placed on two different sheets of paper with a magnifying glass, we will find that the colour, shape and size of all the particles of sugar are the same, but the soil contains particles of different colours, shapes and sizes. For example, the soil contains clay particles,some grass particles and even some dead insects, etc. Now, sugar which contains particles of only one kind is called a pure substance whereas soil which contains particles of different kinds is called an impure substance (or mixture). From this we conclude that all the matter around us is not pure. The matter around us is of two types : pure substances and mixtures. The mixtures are impure substances. We will now discuss pure substances and mixtures in a little more detail.
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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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10. 3. Non-Metals are Bad Conductors of Heat and Electricity.
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11. 6. Metals are Usually Strong. They Have High Tensile Strength.
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18. Chemical Formula for daily use material
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24. To Study the Properties of a Compound of Iron and Sulphur
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28. 4. Metals are Lustrous (or Shiny), and can be Polished.
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30. To Separate a Mixture of Alcohol and Water
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31. To Study the Properties of a Solution
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34. 7. Metals are Solids at the Room Temperature
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36. To Separate the Salt-Water Mixture (or Salt-Solution)
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38. To Study the Properties of a Suspension
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46. Separation of Mixture Of Two Solids
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49. 6. Non-Metals are Not Strong. They Have Low Tensile Strength.
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50. 8. Non-Metals Have Comparatively Low Melting Points and Boiling Points
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