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You are here: Home / Class 8 / Synthetic fibres and Plastics / Plastics

Plastics

Last Updated on September 29, 2020 By Mrs Shilpi Nagpal 4 Comments

Question 1 What are plastics?

Question 2 Give few examples of plastics?

Question 3 Give few uses of polythene?

Question 4 Give few use of polyvinyl chloride?

Question 5 Give few uses of bakelite?

Question 6 Give few uses of melamine?

Question 7 Give few uses of teflon?

Question 8 Write 2 characteristics of bakelite?

Question 9 Write 2 characteristics of melamine?

Question 10 Write 1 characteristics of teflon?

  • NCERT Solutions Class 8 Science

Plastics

A plastic is a synthetic material which can be moulded or set into desired shape when soft and then hardened to produce a durable article.

Plastics are also polymers.They consist of very long molecules made by joining many small molecules together.

For Ex:Polythene,Polyvinyl chloride,Bakelite,Melamine,teflon etc.

Polythene:It is a plastic obtained by the polymerisation of a chemical compound known as ethene.It is tough and durable.It is used in making polythene bags,waterproof plastic sheets, bottles,buckets,dustbins.

Polyvinyl chloride:It is a strong and hard plastic.It is not as flexible as polythene.It is used for making insulation for electric wires,pipes,garden hoses,raincoats,seat cover etc.

Bakelite:It is a very hard and tough plastic.It is a poor conductor of heat and electricity.

It is used for making the handles of various cooking utensils(fry pans,pressure cooker) because

1)It is a poor conductor of heat

2)It does not become soft on getting heated

It is used for making electric switches,plugs and sockets because

1)It does not conduct electricity

2)It does not become soft on getting heated

Melamine is a plastic which can tolerate heat better than other plastics and resist fire.

It is used for making floor tiles,unbreakable kitchenware,ashtray and fire resistant fabric.

Special plastic cookware made of melamine is used in microwave ovens for cooking food.

Teflon is a special plastic on which oil and water does not stick because it has slippery surface.It can withstand high temperature.

It is used for making soles of electric irons,giving non-stick coating on cookwares.

See other topics from Chapter 3 Synthetic Fibres and Plastics
  • Synthetic Fibres
  • Types of synthetic fibres
  • Rayon
  • Nylon
  • Polyester
  • Poly Ethylene Terephthalate and Acrylic
  • Characteristics of Synthetic Fibres
  • Plastics
  • Types of plastics
  • Properties of plastics
  • Biodegradable and Non-biodegradable material
  • Harmful effects of Plastics
  • Steps to save environment from plastic waste

Filed Under: Synthetic fibres and Plastics, Class 8 Tagged With: bakelite, melamine, plastics, polythene, polyvinyl chloride, teflon

About Mrs Shilpi Nagpal

Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years of experience in teaching. She has started this educational website with the mindset of spreading Free Education to everyone.

Reader Interactions

Comments

  1. justin bieber says

    October 27, 2018 at 5:42 pm

    informative

    Reply
  2. Ekta says

    May 1, 2020 at 7:18 am

    Best

    Reply
  3. Janifa jashmin sultana say says

    June 2, 2020 at 9:53 am

    Best outstanding

    Reply
  4. 8th grade student says

    October 30, 2021 at 9:35 pm

    Thank you! very informative for me

    Reply

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