iv) Collect and dispose of biodegradable and nonbiodegradable waste separately. 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. Click here to learn more about types and examples of plastics. 2) Bakelite is a poor conductor of heat and electricity so, it is used for making electric switches and handles of the utensils. Therefore, people always prefer to choose plastic instead of using metals. For manufacturing synthetic fibres cutting of trees or killing of animals is not required and we can conserve our natural environment using synthetic fibres. Nylon is also used for making parachutes and ropes for rock climbing. 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Towards the end of the nineteenth century, scientists were successful in obtaining a fibre having properties similar to that of silk. In the growing consumer market of the 1930s and after, Bakelite faced competition from other thermosetting resins such as urea formaldehyde and melamine formaldehyde and from new thermoplastic resins such as cellulose acetate, polyvinyl chloride, polymethyl methacrylate, and polystyrene. These are called synthetic fibres. Thermosetting: Plastics that cannot be softened again by heating once they are moulded. Improve Your Career with Online Certification Programs. Reducing the usage is a method of conservation of resources. The formation process of these two types of plastics also differs. Would you like to help him? Important Questions and Extra questions are prepared to revise the chapter 3 of Class 8 Science. This is because of their light weight, lower price, good strength and easy handling. I need All small to small ditails in plastic Cotton is a natural polymer, called cellulose. Ex:- Bakelite (used in electrical insulators), Melamine etc. After reading NCERT Books, you have just to go through these questions to prepare the entire chapter for exams. It is further classified into, Homopolymers:Polymers formed by the polymerisation of a single monomeric species. Check the below NCERT MCQ Questions for Class 12 Chemistry Chapter 15 Polymers with Answers Pdf free download. These fibres are made from petrochemicals. Bakelite is a man-made (synthetic) material while Melamine occurs naturally (is organic). 3) Melamine is used for making floor tiles and kitchenware. b) Silk. c) Nylon. They can be easily washed at home. Answer: (a) 9. b) Rayon. The shopkeeper showed her blankets made up of acrylic fibres as well as made up of wool. MCQ Questions for Class 12 Chemistry with Answers were prepared based on the latest exam pattern. NCERT Solutions Class 8 Science; Plastics. Fire proof plastic uniform worn by fire fighters has a coating of _____ to make it fire resistant. Custom Essay Writing Services: How to Choose the Right One. After some time, the cloth disappeared and from their plastic got its name. Synthetic fibre: There are some fibres which made from chemical substances, and they do not obtain from plant or animal sources. Christian was experimenting in his kitchen and by accident, he spilt a mixture of nitric acid and sulphuric acid. It can be drawn into very fine fibres that can be woven like any other yarn. Answer: Thermosetting – bakelite, melamine Thermoplastics – combs, toys. It does test positive for Bakelite but can have a unique look bi-color look about it. 8 Bakelite and Melamine are examples of. Plastic is defined as a material that contains as an essential ingredient an organic substance of large molecular weight. It is advised to restrict the use of plastic because of the following reasons: 1) The articles made of plastics are non-biodegradable. Plastics are poor conductors of heat and electricity. b) Plastic bag, … Example: Bakelite, melamine, etc. 2) Reuse: Resources can be reused wherever possible. (adsbygoogle = window.adsbygoogle || []).push({}); Copyright 2020 by Tiwari Academy – A step towards Free Education, NCERT Solutions for Class 8 Science Chapter 3, Class 8 Science Chapter 3 Important Questions. Plastic takes several years to decompose; it is not environment friendly. Such fibre was obtained by chemical treatment of wood pulp. Cellulose is made up of a large number of glucose units. It is used for making electrical switches, handles of various utensils, etc. Can you write a name of a “Natural polymer”? However, the high temperatures required to create this tends to caus… Why do people choose this type of sweaters? Bakelite and Melamine are examples of a) Thermosetting plastics b) Silk c) Nylon d) Rayon. Thermoset plastics are frequently used for sealed products due to their resistance to deformation and are also among some of the most impact resistant plastics available. Plastic causes environmental pollution. Odd one out: choose the letter of the word that is not related from the other choices. All organic compound comes to this category. Bakelite is a thermosetting plastic, it cannot be molded again whereas Melamine, being a thermoplastic, can be molded any number of times adn reshaped. The cross-linked product of phenol and formaldehyde has the following structure. But plastics do not react with water and air. Bakelite and Melamine are the example of thermosetting plastic. These building blocks are known as monomers, they link together to form long carbon chains called polymers. 2) The burning of plastic waste gives out harmful gases which pollute the air. Can you guess why? A material which gets decomposed through natural processes, such as action by bacteria, is called biodegradable. A familiar example of a condensation polymer is nylon, which is obtained from the reaction of two monomers. Generally, people love to wearing polyester shirts and other dresses. It is used for making floor tiles, kitchenware and fabrics which resist fire. a) Nylon b) Rayon c) Melamine plastic d) Silk. iii) Use bags made of cotton or jute or recycled paper, when you go for shopping. To mop that solution (a mixture of nitric and sulphuric acid) he took a cloth and after moping he kept it over the stove. They do not decompose (or rot) easily. Stuck At Home? Plastic was discovered by famous German chemist Christian Schonbein in 1846. Heavily cross-linked polymers come under the category of thermosetting plastics. Question 8 Write 2 characteristics of bakelite? ... Bakelite, melamine, and Mylar. Why are the chemicals in the laboratory stored in plastic containers ? These polymers are brittle and hard. Define the term synthetic fibre. Today, molding compounds based on epoxy [EP], unsaturated polyester [UP], melamine phenolic [MP] and Class 8 Science Chapter 3 Important Questions are given below updated for new academic session 2020-21. Nylon is another man-made fibre. An example is vulcanized rubber. Although synthetic fibre catches fire easily, it is interesting to know that the uniforms of firemen have coating of “melamine plastic” to make them flame resistant. To avoid this, it is important to use biopolymers or biodegradable polymers. Such as animals, trees, cotton, jute. They are not corroded easily. A common example of linear polymer. Synthetic fibres are more durable and affordable which makes them more popular than natural fibres. Explain the statement. Ask your doubts related to NIOS or CBSE Board and share your knowledge with your friends and other users through Discussion Forum. We should use of bags made of cotton or jute instead of plastic bags when we go for shopping. Class 8 Science Chapter 3 Extra Questions are prepared for academic session 2020-21 and it provides the complete revision of NCERT Book of Class 8 Science Chapter 3. We need not produce resources on large scale which may lead to exploitation of natural resources. “Paheli wants to know the uses of plastic in health-care industry”. And example??? Class 8 Science Chapter 3 Important Questions of Synthetic Fibres and Fabric. There are some of the steps which contribute towards the reducing the use of plastic materials by us. v) Do not throw plastic waste in the street on the pavement or in drains. Bakelite is a thermosetting plastic, it cannot be molded again whereas Melamine, being a thermoplastic, can be molded any number of times adn reshaped. Bakelite and Melamine are examples of (a) Thermosetting plastics (b) Silk (c) Nylon (d) Rayon. Many such small units combine to form a large single unit called a polymer. Melamine is a thermosetting plastic which is resistant to fire and can tolerate heat better than other plastics. Some important properties of bakelite are listed below. Explain. b) Rayon. i)Synthetic fibres are very strong and durable. Why is it hazardous? A synthetic fibre is also a chain of small units joined together. Bakelite is used for making electrical switches whereas melamine is used for floor tiles. Some examples of their use are the packaging of tablets, many bottles, threads used for stitching wounds, syringes, doctors’ gloves and a number of medical instruments and so on. When we add hot water to a plastic bottle, it gets deformed. Which type of plastic is used for non-stick coating on cook-wares? These are used for manufacturing toys, combs and various types of containers. iv) Synthetic fibres are extremely fine and shiny. We should develop habits which are environment friendly. 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