5. Metals are Generally Hard
(except sodium and potassium which are soft metals). Most of the metals are hard. But all the metals are not equally hard. The hardness varies from metal to metal. Most of the metals like iron, copper, aluminium, etc., are very hard. They cannot be cut with a knife. There are some exceptions. Sodium and potassium are soft metals which can be easily cut with a knife.
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Matter in Our Surroundings - Notes
1. 3. Non-Metals are Bad Conductors of Heat and Electricity.
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3. The Case of a Liquid Solute Dissolved in a Liquid Solvent
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5. 7. Metals are Solids at the Room Temperature
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6. 11. Metals Usually Have a Silver or Grey Colour
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8. 7. Non-Metals may be Solid, Liquid or Gases at the Room Temperature.
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11. 6. Non-Metals are Not Strong. They Have Low Tensile Strength.
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12. Separation Of Mixture Of a Solid And a Liquids
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14. To Study the Properties of a Compound of Iron and Sulphur
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16. To Study the Properties of a Colloid
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19. 11. Non-Metals Have Many Different Colours.
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21. 1. Separation by a Suitable Solvent
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24. To Distinguish a Colloid from a Solution
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27. 6. Metals are Usually Strong. They Have High Tensile Strength.
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28. To Study the Properties of a Solution
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32. 2. Separation by a Separating Funnel
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34. 3. Metals are Good Conductors of Heat and Electricity.
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35. Separation of Mixture Of Two Solids
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37. 1. Non-Metals are Not Malleable. Non-Metals are Brittle.
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41. 1. Separation by Fractional Distillation
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