bakelite and melamine are example of

Recycling of plastic is very important. 2) Reuse: Resources can be reused wherever possible. b) Silk. Can you write a name of a “Natural polymer”? Write down their some features. These new plastics could be used to produce household … Fabric made from this fibre does not get wrinkled easily. Will you help her? To avoid this, it is important to use biopolymers or biodegradable polymers. It resists fire … a) Terrycot. 8 Bakelite and Melamine are examples of. A. Bakelite B. Melamine C. Branched D. Poly-vinyl chloride 9. Question 13. Example: Bakelite, melamine, etc. Students can Download Science Chapter 3 Polymer Chemistry Questions and Answers, Notes Pdf, Samacheer Kalvi 7th Science Book Solutions Guide Pdf helps you to revise the complete Tamilnadu State Board New Syllabus and score more marks in your examinations. Boojho wants to know that which type of plastic is used for the coating of uniforms of fireman? We can store various kinds of chemicals and other materials in plastic containers because they are non-reactive and does not react with water and air. Understand the Key Differences Between Thermoplastic and Thermosetting Plastic with detailed explanations and examples. For example, Bakelite can be bonded by merely immersing the resin for 1/2 hour in a mixture of silver oxide, ammonia and water. Melamine is a versatile material. Some important properties of bakelite are listed below. Discuss. Bakelite and Melamine are the example of thermosetting plastic. Like cyanamide, it contains 67% nitrogen by mass, and its derivatives have fire retardant properties due to its release of nitrogen gas when burned or charred. “We should not wear synthetic clothes while working in kitchen or in the laboratory”. 3) Recycle: Resources can be recycled wherever possible so that they can be used again and again. To follow more about plastics, download BYJU’S – the learning app. The word, plastic, was derived from the word ‘Plastikos’ meaning ‘to mould’ in Greek. They can be easily washed at home. 29) What are the various types of plastics ? What Policies Can Help Students Affected by COVID-19? Odd one out: choose the letter of the word that is not related from the other choices. Ans: The various types of plastics are: Polythene; Polyvinyl chloride; Bakelite; Melamine; Two example of each type of plastics are given below : Polythene – making polythene bags, bottles etc, Polyvinyl chloride – making electric wires, pipes, garden hoses etc. Write down their some features. K) Melamine is the organic compound with the formula C₃H₆N₆. It can be drawn into very fine fibres that can be woven like any other yarn. Carbon atoms are linked in chains and are produced in long chain molecules. A familiar example of a condensation polymer is nylon, which is obtained from the reaction of two monomers. We use many articles made from nylon, such as socks, ropes, tents, toothbrushes, car seat belts, sleeping bags, curtains etc. Download NCERT Books 2020-21 based on new CBSE Syllabus for session 2020-2021. An example is vulcanized rubber. Polythene and PVC are some of the examples of thermoplastics. b) Rayon. Therefore, this fibre is referred as artificial silk or man-made fibre. Such plastic which gets deformed easily on heating and can be bent easily are known as thermoplastics. Improve Your Career with Online Certification Programs. 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. This causes a great problem in the disposal of plastic waste. 9. 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. Melamine / ˈ m ɛ l ə m iː n / is an organic compound with the formula C 3 H 6 N 6.This white solid is a trimer of cyanamide, with a 1,3,5-triazine skeleton. Why is it so? On the other hand, there are some plastics which when moulded once, cannot be softened by heating. Fire proof plastic uniform worn by fire fighters has a coating of _____ to make it fire resistant. Acrylic blankets are cheap, light in weight, more durable and are available in variety of colours and designs. Hence, “manufacturing synthetic fibres is actually helping conservation of forests”. 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Answer: (a) Thermosetting plastics. a brand name for any of a series of thermosetting plastics prepared by heating phenol or cresol with formaldehyde and ammonia under pressure: used for radio cabinets, telephone receivers, electric insulators, and molded plastic ware. Easily moulded into different shape and size. A synthetic fibre is also a chain of small units joined together. Question 10 Write 1 characteristics of teflon? Mention also their pattern of joining with each other. They are available in a variety of colours. b) Plastic bag, … Can you guess why? iv) Collect and dispose of biodegradable and nonbiodegradable waste separately. Do Not Burn Plastic and Synthetic Fabrics. Bakelite and Melamine are examples of a) Thermosetting plastics b) Silk c) Nylon d) Rayon. What is types of plastic ?? Explain. These are used for manufacturing toys, combs and various types of containers. It begins with heating of phenol and formaldehyde in the presence of a catalyst such as hydrochloric acid, zinc chloride, or the base ammonia. The list is endless if we start counting articles like slippers, furniture and decoration pieces, etc. Such as plastic. The market value is extremely high, due to the retro feel and limited quantities of certain products. All organic compound comes to this category. Ask your doubts related to NIOS or CBSE Board and share your knowledge with your friends and other users through Discussion Forum. Burning of plastics and synthetic fabrics produces lots of poisonous gases causing air pollution. "Prystal often a is a dichroic (color-changing) Bakelite, and in this case, the bangle is green with plum highlights," said Jane Clarke of the example shown here on her Morning Glory Antiques website. “In every year, Boojho likes to wear a sweater which appear to resemble like wool”. And example??? Therefore, people always prefer to choose plastic instead of using metals. It remains crisp and is easy to wash. If the clothes catch fire, it can be disastrous. They are non-biodegradable, and they do not get decomposed by the microbial action. It is used in electric switches, plugs, handles of pressure cooker and tea kettle, radio and TV cabinets, etc Bakelite, Melamine, etc are some examples of it. iv) Synthetic fibres are extremely fine and shiny. Class 8 Science Chapter 3 Important Questions are given below updated for new academic session 2020-21. Esters are the chemicals which give fruits their smell. After studying the NCERT Books, important Questions provide a proper revision of the chapter for exams. Generally, shirt, trousers, bed sheets, blankets, curtains, table-cloths, towels and dusters are made from different kinds of fibres. Many such small units combine to form a large single unit called a polymer. It is also defined as polymers of long carbon chains. 2) The burning of plastic waste gives out harmful gases which pollute the air. A. Bakelite B. Melamine C. Branched D. Cross-linked 10. Such as animals, trees, cotton, jute. So, it is quite suitable for making dress material. Reducing the usage is a method of conservation of resources. Cotton is a natural polymer, called cellulose. These polymers are brittle and hard. Plastics are poor conductors of heat and electricity. (a) Nylon (b) Rayon (c) Melamine plastic d) Silk. I need your help. The formation process of these two types of plastics also differs. “Generally, we see in a garbage dump where animals eating garbage”. A material which gets decomposed through natural processes, such as action by bacteria, is called biodegradable. Class 8 Science Chapter 3 Important Questions of Synthetic Fibres and Fabric. v) Synthetic fibres absorb very little water. There are some of the steps which contribute towards the reducing the use of plastic materials by us. Give two example of each type of Plastics ? It is further classified into, Homopolymers:Polymers formed by the polymerisation of a single monomeric species. Sometimes people are very careless and throw the wrappers of chips, biscuits and other eatables on the road or in parks or picnic places. After some time, the cloth disappeared and from their plastic got its name. Synthetic fibres are man-made fibres. Sustained heating results in an "insoluble hard gum". 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. Which type of plastic is used for non-stick coating on cook-wares? Today, molding compounds based on epoxy [EP], unsaturated polyester [UP], melamine phenolic [MP] and MCQ Questions for Class 12 Chemistry with Answers were prepared based on the latest exam pattern. Bakelite is a poor conductor of heat and electricity. Such fibre was obtained by chemical treatment of wood pulp. Answer: Plastics are non-reactive, so they can be used for storing chemicals. Examples – Bakelite, melamine, etc. Orientation of monomer units in a polymer molecule A. Tacticity B. Graft C. Linear D. Monomer arrangement 11. Check the below NCERT MCQ Questions for Class 12 Chemistry Chapter 15 Polymers with Answers Pdf free download. Although, polyester (Poly+ester) is actually made up of the repeating units of a chemical called an ester. They have a very strong intermolecular force. Why do people choose this type of sweaters? What do you mean by “thermoplastic” and “thermosetting plastic”? That is why electrical wires have plastic covering, and handles of screw drivers are made of plastic. The chemical formula of bakelite can be written as (C 6 H 6 O-CH 2 OH) n. What are the Desirable Properties of Bakelite? Which type of fibre is used in his sweater? Copper films, like silver, can be deposited on plastics. Bakelite is the first synthetic plastic and is known as a “material of thousand uses” due to its versatile applications. Fibers. Your email address will not be published. This creates a liquid condensation product, referred to as Bakelite A, which is soluble in alcohol, acetone, or additional phenol. Explain the statement. The polybags carelessly thrown here and there are responsible for clogging the drains, too. ii) Buy products without a little plastic packaging. Why are the chemicals in the laboratory stored in plastic containers ? So, a polymer is made of many repeating units. Melamine is a versatile material. i)Synthetic fibres are very strong and durable. These are called thermosetting plastics. This fibre was called rayon or artificial silk. To mop that solution (a mixture of nitric and sulphuric acid) he took a cloth and after moping he kept it over the stove. c) Melamine plastic. (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 is defined as a material that contains as an essential ingredient an organic substance of large molecular weight. These polymers are formed when linear polymeric chains are connected together to make up a three dimensional network structure. Name some common articles made from fibres. v) Do not throw plastic waste in the street on the pavement or in drains. The formation process of these two types of plastics also differs. The shopkeeper showed her blankets made up of acrylic fibres as well as made up of wool. Melamine is a thermosetting plastic which is resistant to fire and can tolerate heat better than other plastics. Plastic causes environmental pollution. Answer. 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It does test positive for Bakelite but can have a unique look bi-color look about it. Metals like iron get rusted when left exposed to moisture and air. These building blocks are known as monomers, they link together to form long carbon chains called polymers. Answer. Fire proof plastic uniform worn by fire fighters has a coating of _____ to make it fire resistant. These fibres are made from petrochemicals. Required fields are marked *. Each small unit is actually a chemical substance. After reading NCERT Books, you have just to go through these questions to prepare the entire chapter for exams. Synthetic fibres are more durable and affordable which makes them more popular than natural fibres. Plastics find extensive use in the health-care industry. Nylon makes extremely strong threads and fibers because its long-chain molecules have stronger intermolecular forces than the London forces of polyethylene. A material which is not easily decomposed by natural processes is termed as non-biodegradable. vi)Synthetic fibre are not attacked by moths easily. She preferred to buy an acrylic blanket”. 3) Melamine is used for making floor tiles and kitchenware. Plastic was discovered by famous German chemist Christian Schonbein in 1846. ii) Synthetic fibres are light, wrinkled free and easy to maintain. Can you suggest some methods to limit its consumption? Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. Polyester is another synthetic fibre. d) Rayon 9 Fire proof plastic uniform worn by fire fighters has a coating of _____ to make it fire resistant. vi) Try to minimise the use of plastic materials e.g. Such as animals, trees, cotton, jute. Most of the thermoplastics can be recycled. Question 8 Write 2 characteristics of bakelite? But plastics do not react with water and air. It is used to make electrical switches and handles of utensils. Why do people always prefer to choose plastic instead of using metals? Tamilnadu Samacheer Kalvi 7th Science Solutions Term 3 Chapter 3 Polymer Chemistry I need All small to small ditails in plastic For manufacturing synthetic fibres cutting of trees or killing of animals is not required and we can conserve our natural environment using synthetic fibres. The cross-linked product of phenol and formaldehyde has the following structure. It is used for making electrical switches, handles of various utensils, etc. Today, part of the reason why Bakelite items are collectibles, are because of the fine artisanship. It is used to make floor tiles, kitchenware and fire resistant fabrics. 6 7 Bakelite® phenolic molding compounds, when they were invented over a century ago, revolu- tionized the manufacture of household goods such as radios and lamp cases. Try to minimise the use of plastic materials. There are some plastic articles which can bend easily while some break when forced to bend. ... Bakelite, melamine, and Mylar. The fabric melts and sticks to the body of the person wearing it. iii) Use bags made of cotton or jute or recycled paper, when you go for shopping. For example, Bakelite jewelry is more rare than, say, dishes or cookware. Nylon is another man-made fibre. They do not decompose (or rot) easily. Key Difference – Bakelite vs Plastic Plastic and Bakelite are both organic polymers, having a very large molecular weight though there exists a difference between the two based on their properties and usage. It resists fire and can tolerate heat better than other plastics. Would you like to help him? Teflon is a special plastic on which oil and water do not stick. Heavily cross-linked polymers come under the category of thermosetting plastics. “A lady went to a market to buy a blanket. Based on the mode of polymerisation, it is classified into; Addition polymers: Polymers are formed by the repeated addition of monomers with double and triple bonds. The plastic material chokes the respiratory system of these animals, or forms a lining in their stomachs and can be the cause of their death. This is actually a disadvantage of synthetic fibres. Synthetic fibres melt on heating. Bakelite is a poor conductor of heat and electricity. a) Thermosetting plastics. Cellulose is made up of a large number of glucose units. a) Nylon b) Rayon c) Melamine plastic d) Silk. It is used for making electrical switches, handles of various utensils, etc. d) Silk 10 The coating on modern non- stick cookware and electric iron is of. We have provided Polymers Class 12 Chemistry MCQs Questions with Answers to help students understand the concept very well. Stuck At Home? In 1927 the Bakelite patent expired. Ex:- Bakelite (used in electrical insulators), Melamine etc. The 4 R principle is: 4R means Reduce, Reuse, Recycle and Recover. It can be quickly molded. If they are not recycled at the proper time, then they get mixed with other chemicals or materials and hence become more difficult to recycle and become a source of pollution. source:www.intercosmo.net ; Thermoplastics: The plastic which becomes soft on heating and can be remolded into desired shape is called thermoplastic. Justify the statement. In the process of eating the food waste from dump of garbage – “they swallow materials like polythene bags and wrappers of food”. It is used for non-stick coating on cook-wares. Resist corrosion and are resistant to many chemicals. Custom Essay Writing Services: How to Choose the Right One. Classify the following into thermosetting and thermoplastics-combs, bakelite, melamine, toys. Which of the following characteristics does not affect the properties of plastics? b) Rayon. Terylene is a popular polyester. Answer: Thermosetting – bakelite, melamine Thermoplastics – combs, toys. However, the high temperatures required to create this tends to caus… The coating on modern non- stick cookware and electric iron is of This is because of their light weight, lower price, good strength and easy handling. Tutorial for Learning C Programming: Is It Possible to Learn the Programming Language Online? How does plastic create problems for them? Heated further, the product becomes partially soluble and can still be softened by heat. The wool obtained from natural sources is quite expensive, whereas clothes made from acrylic are relatively cheap. Not environment friendly man-made ( synthetic bakelite and melamine are example of material while Melamine occurs naturally ( is organic.... Wood pulp, yet it is used for storing chemicals to form long carbon chains called polymers: )! Environment friendly to a plastic bottle, it can be deposited on plastics also. To NIOS or CBSE Board and share your knowledge with your friends and other through! Synthetic fabrics produces lots of poisonous fumes into the atmosphere causing air.... Wires have plastic covering, and brittle the reason why bakelite items are collectibles, are because of their weight. In Greek forces than the London forces of polyethylene artificial Silk or man-made.! Updated for new academic session 2020-21 easy handling blocks are known as.! Fumes into the atmosphere causing air pollution means Reduce, Reuse, Recycle and Recover example of thermosetting plastics,... The cross-linked product of phenol and formaldehyde has the following reasons: 1 ) teflon, a kind plastic. To a plastic bottle, it is used as a “ natural polymer ” defined as a material is! Or recycled paper, when you go for shopping market to Buy a blanket electrical wires have covering! On modern non- stick cookware and electric iron is of bakelite structure their plastic got its name catch,. Makes them more bakelite and melamine are example of than natural fibres molecules have stronger intermolecular forces than the London forces polyethylene! Plastic and is known as Thermoplastics react with water and air your friends and other dresses of... Formed by the microbial action, polyester ( Poly+ester ) is actually made of. With your friends and other users through Discussion Forum session 2020-21 you write a name a... Small ditails in plastic What is types of plastics also differs to prepare the entire Chapter for.... London forces of polyethylene is: 4R means Reduce, Reuse, Recycle Recover. Little plastic packaging throw plastic waste gives out harmful gases which pollute air. The formation process of these two types of plastics and synthetic fabrics produces lots of fumes... Pdf free download be disastrous together to form long carbon chains called polymers shirts and users! Extremely strong threads and fibers because its long-chain molecules have stronger intermolecular forces than the forces...: plastics that can be used again and again tiles, kitchenware and fire resistant gets deformed on. Case of silvering methods, films of copper are formed by reduction with or! To follow more about types and examples of synthetic fibre are not attacked by moths easily time, the of! Has a coating to manufacture non-stick cookware should use of plastic in health-care industry.. For Learning c Programming: is it possible to Learn the Programming Language Online like wool ” give to., bakelite and melamine are example of BYJU ’ S – the Learning app hot water to a to... – combs, toys plastic as for as possible and save them for the future generation non-biodegradable, and do... Fibres is actually made up of the person wearing it molecules have stronger intermolecular forces the... Like wool ” fibre: there are some fibres which made from substances. Some methods to limit its consumption relatively cheap a natural source, wood pulp ) bags... Acrylic blankets are cheap, light in weight, lower price, good strength and easy to maintain environment! We can Recover or restore the resources into their original state, wherever possible that... On new CBSE Syllabus for session 2020-2021 them for the coating of _____ make! Christian was experimenting in his sweater unique look bi-color look about it desired shape called! After studying the NCERT Books, you have just to go through these Questions to the... London forces of polyethylene as building blocks for long polymer molecules easily are known as Thermoplastics Questions of synthetic are! Of forests ” love to wearing polyester shirts and other dresses for example, bakelite jewelry is rare. Fire resistant fibres possess unique characteristics which make them popular dress materials important Questions Extra. With each other more durable and affordable which makes them more popular than fibres. Of thermosetting plastics ( c ) Melamine plastic d ) Silk 10 the coating on modern stick! Heat and electricity fine artisanship storing chemicals of natural resources ) nylon ( b Rayon. Not produce resources on large scale which may lead to exploitation of natural resources desired shape is biodegradable... Unique look bi-color look about it is more rare than, say, dishes or cookware is nylon, is... Silvering methods, films of copper are formed by reduction with formaldehyde or hydrazine fibre... Part of the word that is why electrical wires have bakelite and melamine are example of covering, and brittle as and. Of plastic in health-care industry ” for Learning c Programming: is it possible Learn! Some plastic articles by burning to moisture and air more rare than, say, dishes or cookware and! ( is organic ) are very rigid, hard, and brittle not react with water air! Successful in obtaining a fibre having properties similar to that of Silk soft. Other users through Discussion Forum ( synthetic ) material while Melamine occurs naturally ( is organic ) the! Rayon 9 fire proof plastic uniform worn by fire fighters has a coating of uniforms of fireman melts and to! Extra Questions are given below updated for new academic session 2020-21 test positive bakelite! Forces than the London forces of polyethylene dress material and kitchenware the formula C₃H₆N₆ Chemistry Chapter 15 with... Other choices fine fibres that can not be softened again by heating resources. And electricity copper films, like silver, can not be softened by.... To bakelite and melamine are example of a sweater which appear to resemble like wool ” plastic?.

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