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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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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24. To Study the Properties of a Suspension
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26. 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. 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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42. 11. Metals Usually Have a Silver or Grey Colour
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44. Solutions, Suspensions And Colloids
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46. 1. Separation by a Suitable Solvent
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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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