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. 11. Metals Usually Have a Silver or Grey Colour
Show Notes
2. The Case of a Liquid Solute Dissolved in a Liquid Solvent
Show Notes
8. 7. Non-Metals may be Solid, Liquid or Gases at the Room Temperature.
Show Notes
9. 3. Non-Metals are Bad Conductors of Heat and Electricity.
Show Notes
10. 1. Separation by a Suitable Solvent
Show Notes
11. 6. Metals are Usually Strong. They Have High Tensile Strength.
Show Notes
18. Chemical Formula for daily use material
Show Notes
19. 3. Metals are Good Conductors of Heat and Electricity.
Show Notes
20. To Separate a Mixture of Alcohol and Water
Show Notes
22. To Study the Properties of a Colloid
Show Notes
25. To Study the Properties of a Compound of Iron and Sulphur
Show Notes
28. 4. Metals are Lustrous (or Shiny), and can be Polished.
Show Notes
33. To Study the Properties of a Solution
Show Notes
34. 7. Metals are Solids at the Room Temperature
Show Notes
36. To Separate the Salt-Water Mixture (or Salt-Solution)
Show Notes
37. 8. Non-Metals Have Comparatively Low Melting Points and Boiling Points
Show Notes
43. To Study the Properties of a Suspension
Show Notes
45. Separation Of Mixture Of a Solid And a Liquids
Show Notes
50. Solutions, Suspensions And Colloids
Show Notes
