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Solutions ⇒ Class 8th ⇒ Science ⇒ 3. Synthetic Fibres And Plastics

Solutions 3. Synthetic Fibres And Plastics - Chapter Review | Class 8 Science - Toppers Study

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Solutions 3. Synthetic Fibres And Plastics - Chapter Review | Class 8 Science - Toppers Study

CBSE board students who preparing for class 8 ncert solutions maths and Science solved exercise chapter 3. Synthetic Fibres And Plastics available and this helps in upcoming exams 2022-2023.

You can Find Science solution Class 8 Chapter 3. Synthetic Fibres And Plastics

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Chapter 3 Science class 8

Chapter Review class 8 Science Chapter 3. Synthetic Fibres And Plastics

3. Synthetic Fibres And Plastics

| Chapter Review |

Solutions 3. Synthetic Fibres And Plastics - Chapter Review | Class 8 Science - Toppers Study


Chapter Review:

  • Fabrics are made from fibres obtained from natural or artificial sources.
  • Fibres are also used for making a large variety of household articles.
  • Natural fibres like cotton,wool, silk, etc., are obtained from plants or animals. 
  • The synthetic fibres, on the other hand, are made by human beings that is why these are called synthetic or man-made fibres.
  • Many such small units combine to form a large single unit called a polymer.
  • Polymers occur in nature also. Cotton, for example, is a polymer called cellulose.
  • Cellulose is made up of a large number of glucose units.
  • Such a fibre was obtained by chemical treatment of wood pulp. This fibre was called rayon or artificial silk.
  • Rayon is mixed with cotton to make bed sheets or mixed with wool to make carpets.
  • Nylon fibre was strong,elastic and light.It was lustrous and easy to wash.So ,it became very popular for making clothes and parachutes and ropes for rock climbing.
  • PET is a very familiar form of polyester. It is used for making bottles,utensils, films, wires and many other useful products.
  • Sweaters  and  shawls or blankets are prepared from another type of synthetic fibre called acrylic.
  • All the synthetic fibres are prepared by a number of processes using raw materials of petroleum origin, called petrochemicals.
  • Plastic can be recycled, reused, coloured, melted, rolled into sheets or made into wires.
  • Polythene (Poly+ethene) is an example of a plastic. It is used for making commonly used polythene bags.
  • Such plastic which gets deformed easily on heating and can be bent easily are known as thermoplastics.examples: toys, combs and various types of containers.
  • There are some plastics which when moulded once, can not be softened by heating. These are called thermosetting plastics. examples: bakelite and melamine
  • Plastics do not react with water and air. They are not corroded easily. That is why they are used to store various kinds of material.
  • Plastic is very light, strong, durable and can be moulded into different shapes and sizes, it is used for various purposes. Plastics are generally cheaper than metals.
  • Plastics are poor conductors of heat and electricity. That is why electrical wires have plastic covering, and handles of screw drivers are made of plastic.
  • Teflon is a special plastic on which oil and water do not stick. It is used for nonstick coating on cookwares.
  • A material which gets decomposed through natural processes, such as action by bacteria, is called biodegradable
  • A material which is not easily decomposed by natural processes is termed as non-biodegradable.
  • The 4 R principle is Reduce, Reuse, Recycle and Recover.

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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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