5. Non-Metals are Generally Soft
(except diamond which is extremely hard non-metal). Most of the solid non-metals are quite soft. They can be easily cut with a knife. For example, sulphur and phosphorus are solid non-metals which are quite soft and can be easily cut with a knife. Only one non-metal carbon (in the form of diamond) is very hard. In fact, diamond (which is an allotropic form of carbon) is the hardest natural substance known.
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Matter in Our Surroundings - Notes
1. 11. Metals Usually Have a Silver or Grey Colour
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2. The Case of a Liquid Solute Dissolved in a Liquid Solvent
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8. 7. Non-Metals may be Solid, Liquid or Gases at the Room Temperature.
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9. 3. Non-Metals are Bad Conductors of Heat and Electricity.
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10. 1. Separation by a Suitable Solvent
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11. 6. Metals are Usually Strong. They Have High Tensile Strength.
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18. Chemical Formula for daily use material
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19. 3. Metals are Good Conductors of Heat and Electricity.
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20. To Study the Properties of a Colloid
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21. To Separate a Mixture of Alcohol and Water
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26. To Study the Properties of a Compound of Iron and Sulphur
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28. 4. Metals are Lustrous (or Shiny), and can be Polished.
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33. To Study the Properties of a Solution
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34. 7. Metals are Solids at the Room Temperature
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35. 8. Non-Metals Have Comparatively Low Melting Points and Boiling Points
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38. To Separate the Salt-Water Mixture (or Salt-Solution)
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42. To Study the Properties of a Suspension
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45. Separation Of Mixture Of a Solid And a Liquids
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50. Solutions, Suspensions And Colloids
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