Chemistry

Matter in Our Surroundings

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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Notes

Matter in Our Surroundings - Notes

1. 9. Non-Metals Have Low Densities.

2. 7. Metals are Solids at the Room Temperature

3. 3. Non-Metals are Bad Conductors of Heat and Electricity.

4. Properties of Metals

5. 2. Metals are Ductile.

6. Concentration of a Solution

7. 3. Separation by a Magnet

8. 7. Non-Metals may be Solid, Liquid or Gases at the Room Temperature.

9. 11. Non-Metals Have Many Different Colours.

10. The Case of Solutions

11. 5. Non-Metals are Generally Soft

12. Elements

13. Non-Metals

14. Impure Substances: Mixtures

15. 8. Metals Generally Have High Melting Points and Boiling Points.

16. Is Matter Around Us Pure

17. 1. Metals are Malleable.

18. 2. Separation by Centrifugation

19. 8. Non-Metals Have Comparatively Low Melting Points and Boiling Points

20. Types of Solutions

21. Physical And Chemical Changes

22. 6. Separation by Distillation

23. To Study the Properties of a Suspension

24. 1. Non-Metals are Not Malleable. Non-Metals are Brittle.

25. Effect of Temperature and Pressure on Solubility

26. Chemical Formula for daily use material

27. Properties of a Suspension

28. Separation of Scrap Iron

29. Pure Substances : Elements and Compounds

30. Supply of Drinking Water in a City

31. Solutions, Suspensions And Colloids

32. Solutions

33. properties of a Solution

34. 1. Separation by a Suitable Solvent

35. 4. Non-Metals are Not Lustrous (Not Shiny). They are Dull in Appearance.

36. Mixtures

37. Suspensions

38. 5. Separation by Chromatography

39. Metals, Non-Metals and Metalloids

40. 3. Metals are Good Conductors of Heat and Electricity.

41. Colloids

42. Metals

43. 10. Metals are Sonorous.

44. 2. Non-Metals are Not Ductile.

45. Comparison Among the Properties of Metals and Non-Metals

46. Compounds

47. Chemical Changes

48. 6. Metals are Usually Strong. They Have High Tensile Strength.

49. Properties of Non-Metals

50. Differences Between Mixtures and Compounds