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. 3. Non-Metals are Bad Conductors of Heat and Electricity.
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3. The Case of a Liquid Solute Dissolved in a Liquid Solvent
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5. 7. Metals are Solids at the Room Temperature
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6. 11. Metals Usually Have a Silver or Grey Colour
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7. 7. Non-Metals may be Solid, Liquid or Gases at the Room Temperature.
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10. Separation Of Mixture Of a Solid And a Liquids
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11. 6. Non-Metals are Not Strong. They Have Low Tensile Strength.
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13. To Study the Properties of a Colloid
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15. 11. Non-Metals Have Many Different Colours.
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18. To Study the Properties of a Compound of Iron and Sulphur
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21. 1. Separation by a Suitable Solvent
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24. To Distinguish a Colloid from a Solution
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29. 2. Separation by a Separating Funnel
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31. 6. Metals are Usually Strong. They Have High Tensile Strength.
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32. To Study the Properties of a Solution
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34. 3. Metals are Good Conductors of Heat and Electricity.
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35. 1. Separation by Fractional Distillation
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42. Separation of Mixture Of Two Solids
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44. 1. Non-Metals are Not Malleable. Non-Metals are Brittle.
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49. To Study the Properties of a Suspension
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