Such as animals, trees, cotton, jute. 2) Reuse: Resources can be reused wherever possible. We should, therefore, not wear synthetic clothes while working in in the kitchen or in a laboratory. These new plastics could be used to produce household … A familiar example of a condensation polymer is nylon, which is obtained from the reaction of two monomers. Write down their some features. To mop that solution (a mixture of nitric and sulphuric acid) he took a cloth and after moping he kept it over the stove. 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Bakelite is a man-made (synthetic) material while Melamine occurs naturally (is organic). Would you like to help him? The shopkeeper showed her blankets made up of acrylic fibres as well as made up of wool. Answer: (a) 9. Write down their some features. We need not produce resources on large scale which may lead to exploitation of natural resources. Why do people always prefer to choose plastic instead of using metals? Polyester is another synthetic fibre. 29) What are the various types of plastics ? Some important properties of bakelite are listed below. Orientation of monomer units in a polymer molecule A. Tacticity B. Graft C. Linear D. Monomer arrangement 11. Cotton is a natural polymer, called cellulose. Mention also their pattern of joining with each other. Today, molding compounds based on epoxy [EP], unsaturated polyester [UP], melamine phenolic [MP] and After some time, the cloth disappeared and from their plastic got its name. 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. These polymers are brittle and hard. a) Thermosetting plastics. A common example of linear polymer. Do Not Burn Plastic and Synthetic Fabrics. Such fibre was obtained by chemical treatment of wood pulp. c) Melamine plastic. Which type of fibre is used in his sweater? They can be easily washed at home. Can you write a name of a “Natural polymer”? Synthetic fibres are man-made fibres. The market value is extremely high, due to the retro feel and limited quantities of certain products. Bakelite is a poor conductor of heat and electricity. 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? Such as plastic. All organic compound comes to this category. Understand the Key Differences Between Thermoplastic and Thermosetting Plastic with detailed explanations and examples. It is used for making electrical switches, handles of various utensils, etc. “As a responsible citizen remember the 4R principle”. This causes a great problem in the disposal of plastic waste. “Despite being very useful, it is advised to restrict the use of plastic”. Therefore, this fibre is referred as artificial silk or man-made fibre. Question 10 Write 1 characteristics of teflon? A. Bakelite B. Melamine C. Branched D. Poly-vinyl chloride 9. Question 14. Improve Your Career with Online Certification Programs. "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. Plastic is defined as a material that contains as an essential ingredient an organic substance of large molecular weight. I need your help. “We should not wear synthetic clothes while working in kitchen or in the laboratory”. It resists fire … We should develop habits which are environment friendly. A material which gets decomposed through natural processes, such as action by bacteria, is called biodegradable. Bakelite Structure. “Paheli wants to know the uses of plastic in health-care industry”. A material which is not easily decomposed by natural processes is termed as non-biodegradable. use a steel lunch box instead of a plastic one. They are non-biodegradable, and they do not get decomposed by the microbial action. After studying the NCERT Books, important Questions provide a proper revision of the chapter for exams. Reducing the usage is a method of conservation of resources. 3) Recycle: Resources can be recycled wherever possible so that they can be used again and again. b) Rayon. It is further classified into, Homopolymers:Polymers formed by the polymerisation of a single monomeric species. Tamilnadu Samacheer Kalvi 7th Science Solutions Term 3 Chapter 3 Polymer Chemistry They are not corroded easily. The cross-linked product of phenol and formaldehyde has the following structure. But plastics do not react with water and air. Explain the statement. The coating on modern non- stick cookware and electric iron is of Why is it hazardous? Synthetic fibres melt on heating. Stuck At Home? Try to minimise the use of plastic materials. These polymers are formed when linear polymeric chains are connected together to make up a three dimensional network structure. Instead we can reuse them. It is used for non-stick coating on cook-wares. Plastic causes environmental pollution. Fossil fuels have compounds containing hydrogen and carbon (hydrocarbon) which act as building blocks for long polymer molecules. It resists fire and can tolerate heat better than other plastics. It is usually elastic and soft. vi)Synthetic fibre are not attacked by moths easily. Why? Ex:- Bakelite (used in electrical insulators), Melamine etc. These are called thermosetting plastics. Bakelite and Melamine are examples of a) Thermosetting plastics b) Silk c) Nylon d) Rayon. a) Nylon b) Rayon c) Melamine plastic d) Silk. We have provided Polymers Class 12 Chemistry MCQs Questions with Answers to help students understand the concept very well. Therefore, people always prefer to choose plastic instead of using metals. It does test positive for Bakelite but can have a unique look bi-color look about it. Name some common articles made from fibres. Easily moulded into different shape and size. Bakelite is a poor conductor of heat and electricity. Write down some characteristics of synthetic fibre. It is used for making floor tiles, kitchenware and fabrics which resist fire. Ask your doubts related to NIOS or CBSE Board and share your knowledge with your friends and other users through Discussion Forum. 2) The burning of plastic waste gives out harmful gases which pollute the air. iii) Use bags made of cotton or jute or recycled paper, when you go for shopping. That is why electrical wires have plastic covering, and handles of screw drivers are made of plastic. These fibres are made from petrochemicals. All organic compound comes to this category. 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. They are very rigid, hard, and brittle. ii) Buy products without a little plastic packaging. Examples – Bakelite, melamine, etc. So, it is not advisable to burn plastic and synthetic fabrics. There are some of the steps which contribute towards the reducing the use of plastic materials by us. Some examples include, bakelite and melamine formaldehyde resin. The wool obtained from natural sources is quite expensive, whereas clothes made from acrylic are relatively cheap. 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. Towards the end of the nineteenth century, scientists were successful in obtaining a fibre having properties similar to that of silk. A. Bakelite B. Melamine C. Branched D. Cross-linked 10. A material which is not easily decomposed by natural processes is termed as non-biodegradable. Answer: (c) 10. Your email address will not be published. Fibers. vi) Try to minimise the use of plastic materials e.g. This creates a liquid condensation product, referred to as Bakelite A, which is soluble in alcohol, acetone, or additional phenol. Boojho wants to know that which type of plastic is used for the coating of uniforms of fireman? Resist corrosion and are resistant to many chemicals. 1) Teflon, a kind of plastic is used as a coating to manufacture non-stick cookware. It is used to make electrical switches and handles of utensils. Although rayon is obtained from a natural source, wood pulp, yet it is a man-made fibre. “In every year, Boojho likes to wear a sweater which appear to resemble like wool”. Give example to show that plastics are non-corrosive in nature. Which of the following characteristics does not affect the properties of plastics? The word, plastic, was derived from the word ‘Plastikos’ meaning ‘to mould’ in Greek. 3] Based on Mode of Polymerisation. And example??? Nylon is another man-made fibre. Click here to learn more about types and examples of plastics. For example, Bakelite jewelry is more rare than, say, dishes or cookware. It is used for making electrical switches, handles of various utensils, etc. Each small unit is actually a chemical substance. In the process it releases lots of poisonous fumes into the atmosphere causing air pollution. Class 8 Science Chapter 3 Important Questions of Synthetic Fibres and Fabric. Metals like iron get rusted when left exposed to moisture and air. Fabric made from this fibre does not get wrinkled easily. Custom Essay Writing Services: How to Choose the Right One. Plastics are poor conductors of heat and electricity. In the process of eating the food waste from dump of garbage – “they swallow materials like polythene bags and wrappers of food”. A material which gets decomposed through natural processes, such as action by bacteria, is called biodegradable. Heated further, the product becomes partially soluble and can still be softened by heat. The polybags carelessly thrown here and there are responsible for clogging the drains, too. MCQ Questions for Class 12 Chemistry with Answers were prepared based on the latest exam pattern. 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. How would you contribute towards the reducing the use of plastic materials? These are used for manufacturing toys, combs and various types of containers. K) Melamine is the organic compound with the formula C₃H₆N₆. Fire proof plastic uniform worn by fire fighters has a coating of _____ to make it fire resistant. 2) Bakelite is a poor conductor of heat and electricity so, it is used for making electric switches and handles of the utensils. So, it is not advisable to dispose of the used plastic articles by burning. Depending on physical properties, plastics are divided into two types: Thermoplastic and thermosetting. Bakelite and Melamine are examples of (a) Thermosetting plastics (b) Silk (c) Nylon (d) Rayon. Will you help her? 1) Reduce: We must reduce the use of resources as possible and save them for the future generation. a) Terrycot. A synthetic fibre is also a chain of small units joined together. “Avoid the use of plastic as for as possible”. Check the below NCERT MCQ Questions for Class 12 Chemistry Chapter 15 Polymers with Answers Pdf free download. In 1927 the Bakelite patent expired. Question 8 Write 2 characteristics of bakelite? c) Nylon. Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. ... Bakelite, melamine, and Mylar. Esters are the chemicals which give fruits their smell. They have a very strong intermolecular force. What Policies Can Help Students Affected by COVID-19? Manufacturing Synthetic Fibres is Actually Helping Conservation of Forests, NCERT Solutions for Class 6 Social Science, NCERT Solutions for Class 7 Social Science, NCERT Solutions for Class 8 Social Science, NCERT Solutions for Class 9 Social Science, NCERT Solutions for Class 10 Social Science, NCERT Solutions for Class 11 Business Studies, NCERT Solutions for Class 11 Physical Education, NCERT Solutions for Class 12 Business Studies, NCERT Solutions for Class 12 Physical Education, CBSE Sample Papers for Class 10 Session 2020-2021, CBSE Sample Papers for Class 12 Session 2020-2021, Class 8 Science Chapter 4 Important Questions, Top Essay Writing Service with Tons of Pros. Classify the following into thermosetting and thermoplastics-combs, bakelite, melamine, toys. Answer: Thermosetting – bakelite, melamine Thermoplastics – combs, toys. Melamine is a versatile material. Such plastic which gets deformed easily on heating and can be bent easily are known as thermoplastics. The 4 R principle is: 4R means Reduce, Reuse, Recycle and Recover. It is better to recycle the plastic waste. Most of the thermoplastics can be recycled. 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. Today, part of the reason why Bakelite items are collectibles, are because of the fine artisanship. iv) Collect and dispose of biodegradable and nonbiodegradable waste separately. Synthetic fibre: There are some fibres which made from chemical substances, and they do not obtain from plant or animal sources. Many such small units combine to form a large single unit called a polymer. These are called synthetic fibres. NCERT Solutions Class 8 Science; Plastics. Example: Bakelite, melamine, etc. 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. v) Synthetic fibres absorb very little water. 4) Recover: We can recover or restore the resources into their original state, wherever possible. Sometimes people are very careless and throw the wrappers of chips, biscuits and other eatables on the road or in parks or picnic places. Explain. Cellulose is made up of a large number of glucose units. Required fields are marked *. Being lighter as compared to metals, plastics are used in cars, aircrafts and spacecrafts, too. Recycling of plastic is very important. (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. 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. I need All small to small ditails in plastic Give two example of each type of Plastics ? Synthetic fibres are more durable and affordable which makes them more popular than natural fibres. Such as plastic. Can you suggest some methods to limit its consumption? Thermosetting: Plastics that cannot be softened again by heating once they are moulded. Although, polyester (Poly+ester) is actually made up of the repeating units of a chemical called an ester. This is because of their light weight, lower price, good strength and easy handling. Class 8 Science Chapter 3 Important Questions are given below updated for new academic session 2020-21. Question 9 Write 2 characteristics of melamine? 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. 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 word ‘polymer’ comes from two Greek words; “poly” meaning “many” and “mer” meaning “part/unit”. Bakelite is the first synthetic plastic and is known as a “material of thousand uses” due to its versatile applications. To avoid this, it is important to use biopolymers or biodegradable polymers. Melamine is a thermosetting plastic which is resistant to fire and can tolerate heat better than other plastics. The list is endless if we start counting articles like slippers, furniture and decoration pieces, etc. How does plastic create problems for them? Which type of plastic is used for non-stick coating on cook-wares? “A lady went to a market to buy a blanket. ii) Synthetic fibres are light, wrinkled free and easy to maintain. For example, Bakelite can be bonded by merely immersing the resin for 1/2 hour in a mixture of silver oxide, ammonia and water. Hence, “manufacturing synthetic fibres is actually helping conservation of forests”. We should use of bags made of cotton or jute instead of plastic bags when we go for shopping. If the clothes catch fire, it can be disastrous. Making Bakelite is a multi-stage process. Christian was experimenting in his kitchen and by accident, he spilt a mixture of nitric acid and sulphuric acid. i) Avoid the use of plastics as far as possible. What do you mean by “thermoplastic” and “thermosetting plastic”? It is used to make floor tiles, kitchenware and fire resistant fabrics. 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. Question 13. Define the term synthetic fibre. Carbon atoms are linked in chains and are produced in long chain molecules. Plastics find extensive use in the health-care industry. The fabric melts and sticks to the body of the person wearing it. (a) Nylon (b) Rayon (c) Melamine plastic d) Silk. Such as animals, trees, cotton, jute. iv) Synthetic fibres are extremely fine and shiny. Plastic takes several years to decompose; it is not environment friendly. 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. 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. 9. Answer. 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. There are some plastic articles which can bend easily while some break when forced to bend. 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. Fire proof plastic uniform worn by fire fighters has a coating of _____ to make it fire resistant. Your email address will not be published. Copper films, like silver, can be deposited on plastics. Plastics were actually discovered accidentally. Just as in the case of silvering methods, films of copper are formed by reduction with formaldehyde or hydrazine. Why is it so? This is actually a disadvantage of synthetic fibres. Discuss. Answer. So, it is quite suitable for making dress material. When we add hot water to a plastic bottle, it gets deformed. It is advised to restrict the use of plastic because of the following reasons: 1) The articles made of plastics are non-biodegradable. Polythene and PVC are some of the examples of thermoplastics. Bakelite and Melamine are the example of thermosetting plastic. It is also defined as polymers of long carbon chains. These are prepared from a type of synthetic fibre, called acrylic. Burning of plastics and synthetic fabrics produces lots of poisonous gases causing air pollution. a) Nylon. Answer: Plastics are non-reactive, so they can be used for storing chemicals. Terylene is a popular polyester. source:www.intercosmo.net ; Thermoplastics: The plastic which becomes soft on heating and can be remolded into desired shape is called thermoplastic. Working in in the case of silvering methods, films of copper are formed by reduction with formaldehyde hydrazine... We need not produce resources on large scale which may lead to exploitation of natural resources for bakelite can. 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