Chemistry

Matter in Our Surroundings


3. Metals are Good Conductors of Heat and Electricity.


This means that metals allow heat and electricity to pass through them easily. Metals are generally good conductors of heat (The conduction of heat is also called thermal conductivity). Silver metal is the best conductor of heat.It has the highest thermal conductivity. Copper and aluminium metals are also very good conductors of heat. The cooking utensils and water boilers, etc., are usually made of copper or aluminium metals because they are very good conductors of heat. The poorest conductor of heat among the metals is lead. Mercury metal is also a poor conductor of heat.
Metals are good conductors of electricity. The metals offer very little resistance to the flow of electric current and hence show high electrical conductivity. Silver metal is the best conductor of electricity. Copper metal is the next best conductor of electricity followed by gold, aluminium and tungsten. The electric wires are made of copper and aluminium metals because they are very good conductors of electricity. The metals like iron and mercury offer comparatively greater resistance to the flow of current, so they have lower electrical conductivity.

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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. 5. Non-Metals are Generally Soft
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13. Non-Metals
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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. Physical And Chemical Changes
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24. To Study the Properties of a Suspension
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25. Properties of a Suspension
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26. Pure Substances : Elements and Compounds
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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. 1. Separation by Fractional Distillation
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36. 4. Non-Metals are Not Lustrous (Not Shiny). They are Dull in Appearance.
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37. Separation of Mixture Of Two Solids
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38. To Separate the Salt-Water Mixture (or Salt-Solution)
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39. Chemical Formula for daily use material
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40. Metals, Non-Metals and Metalloids
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41. 5. Metals are Generally Hard
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42. 11. Metals Usually Have a Silver or Grey Colour
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43. Compounds
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44. Solutions, Suspensions And Colloids
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45. Chemical Changes
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46. 1. Separation by a Suitable Solvent
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47. Separation of Scrap Iron
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48. Separation Of Mixture Of a Solid And a Liquids
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49. 2. Separation by a Separating Funnel
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50. 4. Metals are Lustrous (or Shiny), and can be Polished.
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