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Solutions ⇒ Class 8th ⇒ Science ⇒ 4. Materials : Metals And Non-Metals

Solutions 4. Materials : Metals And Non-Metals - Chapter Review | Class 8 Science - Toppers Study

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Solutions 4. Materials : Metals And Non-Metals - Chapter Review | Class 8 Science - Toppers Study

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Chapter 4 Science class 8

Chapter Review class 8 Science Chapter 4. Materials : Metals And Non-Metals

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  • Solutions 4. Materials : Metals And Non-Metals - Chapter Review | Class 8 Science - Toppers Study
  • Class 8 Ncert Solutions
  • Solution Chapter 4. Materials : Metals And Non-Metals Class 8
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  • Chapter 4. Materials : Metals And Non-Metals Chapter Review Class 8

4. Materials : Metals And Non-Metals

| Chapter Review |

Solutions 4. Materials : Metals And Non-Metals - Chapter Review | Class 8 Science - Toppers Study


Chapter Review:

  • The materials which have the property of hard, malleable, ductile, sonorous and good conductor of heat and electricity. These are called metals.examples: iron, copper, aluminium, calcium, magnesium, etc.
  • The property of metals by which they can be beaten into thin sheets is called malleability.
  • The property of metal by which it can be drawn into wires is called ductility.
  • Metals produce ringing sounds, They are said to be sonorous. 
  • Some materials are soft and dull and they break down into powdery mass on tapping with hammer. They are not sonorous and are poor conductors of heat and electricity. These materials are called non-metals. Examples: sulphur, carbon, oxygen, phosphorus, etc.
  • Metals like sodium and potassium are soft and can be cut with a knife.
  • Mercury is the only metal which is found in liquid state at room
    temperature.
  • General, metallic oxides are basic in nature and non-metals oxides are acidic in nature.
  • Sodium metal is very reactive. It reacts vigorously with oxygen and
    water therefore, stored in kerosene.
  • Phosphorus is a very reactive non-metal.It catches fire if exposed to air. To prevent the contact of phosphorus with atmospheric oxygen, it is stored in water.
  • Metals react with acids and produce metal salts and hydrogen gas that burns with a ‘pop’ sound.
  • Metals are used in making machinery,automobiles, aeroplanes, trains, satellites, industrial gadgets, cooking utensils, water boilers, etc.
  • Non-metals used in crackers,water purification process and fertilisers to enhance the growth of plants.
  • More reactive metals displace less reactive metals from their compounds in aqueous solutions.

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Solutions ⇒ Class 8th ⇒ Science
1. Crop Production And Management
2. Microorganisms : Friend And Foe
3. Synthetic Fibres And Plastics
4. Materials : Metals And Non-Metals
5. Coal And Petroleum
6. Combustion And Flame
7. Conservation of Plants And Animals
8. Cell - Structure and functions
9. Reproduction in animals
10. Reaching the age of adolescence
11. Force And Pressure
12. Friction
13. Sound
14. Chemical Effects of Electric Current
15. Some Natural Phenomena
16. Light
17. Stars And The Solar System
18. Pollution of Air and Water

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