Chemistry

Matter in Our Surroundings


Physical And Chemical Changes


There are some changes during which no new substances are formed. On the other hand, there are some other changes during which new substances are formed. So, on the basis of whether new substance are formed or not, we can classify all the changes into two groups physical chnges and chemical changes We will now discuss physical changes and chemical changes in deta.l,one by one. Let us start with the physical changes.

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Notes


Matter in Our Surroundings - Notes
1. 9. Non-Metals Have Low Densities.
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2. 2. Metals are Ductile.
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3. 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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5. The Case of Solutions
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6. Properties of Metals
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7. 11. Non-Metals Have Many Different Colours.
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8. 3. Separation by a Magnet
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9. Concentration of a Solution
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10. 7. Non-Metals may be Solid, Liquid or Gases at the Room Temperature.
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11. Impure Substances: Mixtures
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12. Non-Metals
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13. 5. Non-Metals are Generally Soft
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14. Is Matter Around Us Pure
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15. Elements
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16. 6. Separation by Distillation
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17. 8. Non-Metals Have Comparatively Low Melting Points and Boiling Points
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18. 8. Metals Generally Have High Melting Points and Boiling Points.
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19. Types of Solutions
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20. 2. Separation by Centrifugation
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21. 1. Metals are Malleable.
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22. Solutions
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23. To Study the Properties of a Suspension
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24. Physical And Chemical Changes
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25. Pure Substances : Elements and Compounds
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26. Properties of a Suspension
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27. Metals
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28. Effect of Temperature and Pressure on Solubility
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29. 1. Non-Metals are Not Malleable. Non-Metals are Brittle.
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30. 2. Non-Metals are Not Ductile.
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31. 10. Non-Metals are Not Sonorous.
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32. Separation of the Gases of the Air
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33. To Study the Properties of a Solution
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34. 4. Purification by Crystallisation
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35. 4. Non-Metals are Not Lustrous (Not Shiny). They are Dull in Appearance.
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36. To Separate the Salt-Water Mixture (or Salt-Solution)
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37. 1. Separation by Fractional Distillation
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38. Chemical Formula for daily use material
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39. Compounds
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40. Solutions, Suspensions And Colloids
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41. Chemical Changes
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42. 1. Separation by a Suitable Solvent
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43. Separation of Scrap Iron
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44. Separation Of Mixture Of a Solid And a Liquids
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45. 2. Separation by a Separating Funnel
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46. Metals, Non-Metals and Metalloids
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47. 5. Metals are Generally Hard
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48. 9. Metals Have High Densities.
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49. 11. Metals Usually Have a Silver or Grey Colour
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50. Properties of Non-Metals
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