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.
Notes
Matter in Our Surroundings - Notes
1. The Case of a Liquid Solute Dissolved in a Liquid Solvent
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2. 11. Metals Usually Have a Silver or Grey Colour
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5. 3. Non-Metals are Bad Conductors of Heat and Electricity.
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9. To Study the Properties of a Colloid
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12. 7. Non-Metals may be Solid, Liquid or Gases at the Room Temperature.
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14. Separation Of Mixture Of a Solid And a Liquids
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16. 1. Separation by a Suitable Solvent
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18. 6. Metals are Usually Strong. They Have High Tensile Strength.
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20. To Separate a Mixture of Alcohol and Water
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21. 6. Non-Metals are Not Strong. They Have Low Tensile Strength.
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22. To Study the Properties of a Compound of Iron and Sulphur
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25. To Study the Properties of a Solution
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28. Separation of Mixture Of Two Solids
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29. 3. Metals are Good Conductors of Heat and Electricity.
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30. 11. Non-Metals Have Many Different Colours.
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32. Chemical Formula for daily use material
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34. To Separate the Salt-Water Mixture (or Salt-Solution)
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44. 7. Metals are Solids at the Room Temperature
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46. 4. Metals are Lustrous (or Shiny), and can be Polished.
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