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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Matter in Our Surroundings - Notes
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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7. 11. Non-Metals Have Many Different Colours.
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10. 7. Non-Metals may be Solid, Liquid or Gases at the Room Temperature.
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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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23. To Study the Properties of a Suspension
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25. Pure Substances : Elements and Compounds
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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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33. To Study the Properties of a Solution
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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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40. Solutions, Suspensions And Colloids
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42. 1. Separation by a Suitable Solvent
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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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49. 11. Metals Usually Have a Silver or Grey Colour
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