She preferred to buy an acrylic blanket”. They are not corroded easily. Sometimes people are very careless and throw the wrappers of chips, biscuits and other eatables on the road or in parks or picnic places. It resists fire and can tolerate heat better than other plastics. Melamine is a versatile material. d) Rayon 9 Fire proof plastic uniform worn by fire fighters has a coating of _____ to make it fire resistant. Would you like to help him? Orientation of monomer units in a polymer molecule A. Tacticity B. Graft C. Linear D. Monomer arrangement 11. Today if we think of storing a food item, water, milk, pickles, dry food, etc., plastic containers seem most convenient. Fire proof plastic uniform worn by fire fighters has a coating of _____ to make it fire resistant. Bakelite is a man-made (synthetic) material while Melamine occurs naturally (is organic). Required fields are marked *. But plastics do not react with water and air. Can you write a name of a “Natural polymer”? The 4 R principle is: 4R means Reduce, Reuse, Recycle and Recover. use a steel lunch box instead of a plastic one. These polymers are formed when linear polymeric chains are connected together to make up a three dimensional network structure. Question 9 Write 2 characteristics of melamine? Hence, “manufacturing synthetic fibres is actually helping conservation of forests”. Fossil fuels have compounds containing hydrogen and carbon (hydrocarbon) which act as building blocks for long polymer molecules. How does plastic create problems for them? iv) Synthetic fibres are extremely fine and shiny. Carbon atoms are linked in chains and are produced in long chain molecules. Bakelite is a man-made (synthetic) material while Melamine occurs naturally (is organic). c) Nylon. 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? These new plastics could be used to produce household … To avoid this, it is important to use biopolymers or biodegradable polymers. How would you contribute towards the reducing the use of plastic materials? 1) Teflon, a kind of plastic is used as a coating to manufacture non-stick cookware. Plastics are poor conductors of heat and electricity. Some examples of synthetic fibres are polyester, nylon and acrylic. In the process of eating the food waste from dump of garbage – “they swallow materials like polythene bags and wrappers of food”. Answer: Plastics are non-reactive, so they can be used for storing chemicals. 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. Making Bakelite is a multi-stage process. The formation process of these two types of plastics also differs. There are some of the steps which contribute towards the reducing the use of plastic materials by us. b) Plastic bag, … Most of the thermoplastics can be recycled. Plastic is defined as a material that contains as an essential ingredient an organic substance of large molecular weight. The wool obtained from natural sources is quite expensive, whereas clothes made from acrylic are relatively cheap. “We should not wear synthetic clothes while working in kitchen or in the laboratory”. Thermosetting: Plastics that cannot be softened again by heating once they are moulded. Christian was experimenting in his kitchen and by accident, he spilt a mixture of nitric acid and sulphuric acid. source:www.intercosmo.net ; Thermoplastics: The plastic which becomes soft on heating and can be remolded into desired shape is called thermoplastic. Write down their some features. b) Rayon. Question 13. Polythene and PVC are some of the examples of thermoplastics. Melamine is a thermosetting plastic which is resistant to fire and can tolerate heat better than other plastics. Copper films, like silver, can be deposited on plastics. NCERT Solutions Class 8 Science; Plastics. 8 Bakelite and Melamine are examples of. It does test positive for Bakelite but can have a unique look bi-color look about it. Nylon is also used for making parachutes and ropes for rock climbing. 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. Examples – Bakelite, melamine, etc. It remains crisp and is easy to wash. Depending on physical properties, plastics are divided into two types: Thermoplastic and thermosetting. For example, Bakelite jewelry is more rare than, say, dishes or cookware. Being lighter as compared to metals, plastics are used in cars, aircrafts and spacecrafts, too. So, it is not advisable to dispose of the used plastic articles by burning. We use many articles made from nylon, such as socks, ropes, tents, toothbrushes, car seat belts, sleeping bags, curtains etc. CBSE Previous Year Question Papers Class 10, CBSE Previous Year Question Papers Class 12, NCERT Solutions Class 11 Business Studies, NCERT Solutions Class 12 Business Studies, NCERT Solutions Class 12 Accountancy Part 1, NCERT Solutions Class 12 Accountancy Part 2, 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 9 Maths Chapter 1, NCERT Solutions For Class 9 Maths Chapter 2, NCERT Solutions For Class 9 Maths Chapter 3, NCERT Solutions For Class 9 Maths Chapter 4, NCERT Solutions For Class 9 Maths Chapter 5, NCERT Solutions For Class 9 Maths Chapter 6, NCERT Solutions For Class 9 Maths Chapter 7, NCERT Solutions For Class 9 Maths Chapter 8, NCERT Solutions For Class 9 Maths Chapter 9, NCERT Solutions For Class 9 Maths Chapter 10, NCERT Solutions For Class 9 Maths Chapter 11, NCERT Solutions For Class 9 Maths Chapter 12, NCERT Solutions For Class 9 Maths Chapter 13, NCERT Solutions For Class 9 Maths Chapter 14, NCERT Solutions For Class 9 Maths Chapter 15, NCERT Solutions for Class 9 Science Chapter 1, NCERT Solutions for Class 9 Science Chapter 2, NCERT Solutions for Class 9 Science Chapter 3, NCERT Solutions for Class 9 Science Chapter 4, NCERT Solutions for Class 9 Science Chapter 5, NCERT Solutions for Class 9 Science Chapter 6, NCERT Solutions for Class 9 Science Chapter 7, NCERT Solutions for Class 9 Science Chapter 8, NCERT Solutions for Class 9 Science Chapter 9, NCERT Solutions for Class 9 Science Chapter 10, NCERT Solutions for Class 9 Science Chapter 12, NCERT Solutions for Class 9 Science Chapter 11, NCERT Solutions for Class 9 Science Chapter 13, NCERT Solutions for Class 9 Science Chapter 14, NCERT Solutions for Class 9 Science Chapter 15, NCERT Solutions for Class 10 Social Science, NCERT Solutions for Class 10 Maths Chapter 1, NCERT Solutions for Class 10 Maths Chapter 2, NCERT Solutions for Class 10 Maths Chapter 3, NCERT Solutions for Class 10 Maths Chapter 4, NCERT Solutions for Class 10 Maths Chapter 5, NCERT Solutions for Class 10 Maths Chapter 6, NCERT Solutions for Class 10 Maths Chapter 7, NCERT Solutions for Class 10 Maths Chapter 8, NCERT Solutions for Class 10 Maths Chapter 9, NCERT Solutions for Class 10 Maths Chapter 10, NCERT Solutions for Class 10 Maths Chapter 11, NCERT Solutions for Class 10 Maths Chapter 12, NCERT Solutions for Class 10 Maths Chapter 13, NCERT Solutions for Class 10 Maths Chapter 14, NCERT Solutions for Class 10 Maths Chapter 15, NCERT Solutions for Class 10 Science Chapter 1, NCERT Solutions for Class 10 Science Chapter 2, NCERT Solutions for Class 10 Science Chapter 3, NCERT Solutions for Class 10 Science Chapter 4, NCERT Solutions for Class 10 Science Chapter 5, NCERT Solutions for Class 10 Science Chapter 6, NCERT Solutions for Class 10 Science Chapter 7, NCERT Solutions for Class 10 Science Chapter 8, NCERT Solutions for Class 10 Science Chapter 9, NCERT Solutions for Class 10 Science Chapter 10, NCERT Solutions for Class 10 Science Chapter 11, NCERT Solutions for Class 10 Science Chapter 12, NCERT Solutions for Class 10 Science Chapter 13, NCERT Solutions for Class 10 Science Chapter 14, NCERT Solutions for Class 10 Science Chapter 15, NCERT Solutions for Class 10 Science Chapter 16, Important Questions For Class 11 Chemistry, Important Questions For Class 12 Chemistry, CBSE Previous Year Question Papers Class 10 Science, CBSE Previous Year Question Papers Class 12 Physics, CBSE Previous Year Question Papers Class 12 Chemistry, CBSE Previous Year Question Papers Class 12 Biology, ICSE Previous Year Question Papers Class 10 Physics, ICSE Previous Year Question Papers Class 10 Chemistry, ICSE Previous Year Question Papers Class 10 Maths, ISC Previous Year Question Papers Class 12 Physics, ISC Previous Year Question Papers Class 12 Chemistry, ISC Previous Year Question Papers Class 12 Biology. The polybags carelessly thrown here and there are responsible for clogging the drains, too. 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. Example: Bakelite, melamine, etc. We need not produce resources on large scale which may lead to exploitation of natural resources. 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. It can be quickly molded. Besides, the burning process in the synthetic material is quite slow and it does not get completely burnt easily. b) Rayon. (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. Synthetic fibres are more durable and affordable which makes them more popular than natural fibres. 3) Melamine is used for making floor tiles and kitchenware. Justify the statement. Give two example of each type of Plastics ? It is also defined as polymers of long carbon chains. vi)Synthetic fibre are not attacked by moths easily. Define the term synthetic fibre. Answer. 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. To mop that solution (a mixture of nitric and sulphuric acid) he took a cloth and after moping he kept it over the stove. 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. It is usually elastic and soft. Plastic takes several years to decompose; it is not environment friendly. a) Nylon. After reading NCERT Books, you have just to go through these questions to prepare the entire chapter for exams. All organic compound comes to this category. They do not decompose (or rot) easily. Should we not think twice before doing so? Plastics were actually discovered accidentally. Such as plastic. 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. Bakelite is a thermosetting plastic, it cannot be molded again whereas Melamine, being a thermoplastic, can be molded any number of times adn reshaped. Synthetic fibres melt on heating. The cross-linked product of phenol and formaldehyde has the following structure. It is used for making electrical switches, handles of various utensils, etc. 9. Important Questions and Extra questions are prepared to revise the chapter 3 of Class 8 Science. Many such small units combine to form a large single unit called a polymer. Boojho wants to know that which type of plastic is used for the coating of uniforms of fireman? Click here to learn more about types and examples of plastics. Question 10 Write 1 characteristics of teflon? Polymerization is the process by which monomer molecules are reacted together in a chemical reaction to form a polymer chain (or three-dimensional networks). Today, part of the reason why Bakelite items are collectibles, are because of the fine artisanship. 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. “In every year, Boojho likes to wear a sweater which appear to resemble like wool”. “Avoid the use of plastic as for as possible”. 3] Based on Mode of Polymerisation. 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. These are called thermosetting plastics. 29) What are the various types of plastics ? a) Terrycot. It resists fire … "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. It is used for making floor tiles, kitchenware and fabrics which resist fire. Generally, shirt, trousers, bed sheets, blankets, curtains, table-cloths, towels and dusters are made from different kinds of fibres. I need All small to small ditails in plastic iii) Use bags made of cotton or jute or recycled paper, when you go for shopping. Why? Each small unit is actually a chemical substance. 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. Cellulose is made up of a large number of glucose units. Question 8 Write 2 characteristics of bakelite? It can be drawn into very fine fibres that can be woven like any other yarn. Discuss. Mention also their pattern of joining with each other. Bakelite is a thermosetting plastic, it cannot be molded again whereas Melamine, being a thermoplastic, can be molded any number of times adn reshaped. To follow more about plastics, download BYJU’S – the learning app. Although, polyester (Poly+ester) is actually made up of the repeating units of a chemical called an ester. Such fibre was obtained by chemical treatment of wood pulp. Can you suggest some methods to limit its consumption? The word ‘polymer’ comes from two Greek words; “poly” meaning “many” and “mer” meaning “part/unit”. Write down some characteristics of synthetic fibre. A material which is not easily decomposed by natural processes is termed as non-biodegradable. v) Do not throw plastic waste in the street on the pavement or in drains. Bakelite and Melamine are examples of (a) Thermosetting plastics (b) Silk (c) Nylon (d) Rayon. Bakelite is a poor conductor of heat and electricity. Answer. b) Silk. Heavily cross-linked polymers come under the category of thermosetting plastics. A common example of linear polymer. They have a very strong intermolecular force. They are very rigid, hard, and brittle. Such as animals, trees, cotton, jute. Polyester is another synthetic fibre. 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. Instead we can reuse them. 1) Reduce: We must reduce the use of resources as possible and save them for the future generation. A material which gets decomposed through natural processes, such as action by bacteria, is called biodegradable. 2) Bakelite is a poor conductor of heat and electricity so, it is used for making electric switches and handles of the utensils. Easily moulded into different shape and size. A familiar example of a condensation polymer is nylon, which is obtained from the reaction of two monomers. Plastic causes environmental pollution. 2) The burning of plastic waste gives out harmful gases which pollute the air. Answer: (a) Thermosetting plastics. Just as in the case of silvering methods, films of copper are formed by reduction with formaldehyde or hydrazine. A material which gets decomposed through natural processes, such as action by bacteria, is called biodegradable. The fabric melts and sticks to the body of the person wearing it. When we add hot water to a plastic bottle, it gets deformed. Today, molding compounds based on epoxy [EP], unsaturated polyester [UP], melamine phenolic [MP] and Fibers. Plastics find extensive use in the health-care industry. 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. a) Nylon b) Rayon c) Melamine plastic d) Silk. In the process it releases lots of poisonous fumes into the atmosphere causing air pollution. Improve Your Career with Online Certification Programs. Your email address will not be published. On the other hand, there are some plastics which when moulded once, cannot be softened by heating. Nylon makes extremely strong threads and fibers because its long-chain molecules have stronger intermolecular forces than the London forces of polyethylene. Give example to show that plastics are non-corrosive in nature. For example, Bakelite can be bonded by merely immersing the resin for 1/2 hour in a mixture of silver oxide, ammonia and water. Bakelite and Melamine are the example of thermosetting plastic. Ex:- Bakelite (used in electrical insulators), Melamine etc. vi) Try to minimise the use of plastic materials e.g. Metals like iron get rusted when left exposed to moisture and air. Heated further, the product becomes partially soluble and can still be softened by heat. Answer: (c) 10. Plastic was discovered by famous German chemist Christian Schonbein in 1846. “As a responsible citizen remember the 4R principle”. Some important properties of bakelite are listed below. i)Synthetic fibres are very strong and durable. Question 14. ii) Synthetic fibres are light, wrinkled free and easy to maintain. Try to minimise the use of plastic materials. iv) Collect and dispose of biodegradable and nonbiodegradable waste separately. Esters are the chemicals which give fruits their smell. A. Bakelite B. Melamine C. Branched D. Cross-linked 10. Custom Essay Writing Services: How to Choose the Right One. 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. Check the below NCERT MCQ Questions for Class 12 Chemistry Chapter 15 Polymers with Answers Pdf free download. Fire proof plastic uniform worn by fire fighters has a coating of _____ to make it fire resistant. These polymers are brittle and hard. Classify the following into thermosetting and thermoplastics-combs, bakelite, melamine, toys. This creates a liquid condensation product, referred to as Bakelite A, which is soluble in alcohol, acetone, or additional phenol. Which type of plastic is used for non-stick coating on cook-wares? Tutorial for Learning C Programming: Is It Possible to Learn the Programming Language Online? It is used for non-stick coating on cook-wares. These are prepared from a type of synthetic fibre, called acrylic. ii) Buy products without a little plastic packaging. After studying the NCERT Books, important Questions provide a proper revision of the chapter for exams. It is used for making electrical switches, handles of various utensils, etc. Answer: Thermosetting – bakelite, melamine Thermoplastics – combs, toys. Acrylic blankets are cheap, light in weight, more durable and are available in variety of colours and designs. However, the high temperatures required to create this tends to caus… These fibres are made from petrochemicals. “Generally, we see in a garbage dump where animals eating garbage”. Why do people always prefer to choose plastic instead of using metals? The list is endless if we start counting articles like slippers, furniture and decoration pieces, etc. The coating on modern non- stick cookware and electric iron is of Your email address will not be published. They are non-biodegradable, and they do not get decomposed by the microbial action. Synthetic fibre: There are some fibres which made from chemical substances, and they do not obtain from plant or animal sources. Explain the statement. Bakelite is used for making electrical switches whereas melamine is used for floor tiles. After some time, the cloth disappeared and from their plastic got its name. So, it is not advisable to burn plastic and synthetic fabrics. Bakelite and Melamine are examples of a) Thermosetting plastics b) Silk c) Nylon d) Rayon. Nylon is another man-made fibre. The word, plastic, was derived from the word ‘Plastikos’ meaning ‘to mould’ in Greek. Some examples include, bakelite and melamine formaldehyde resin. Ask your doubts related to NIOS or CBSE Board and share your knowledge with your friends and other users through Discussion Forum. iii)Synthetic fibres are less expensive and readily available in the market. In 1927 the Bakelite patent expired. Why are the chemicals in the laboratory stored in plastic containers ? Understand the Key Differences Between Thermoplastic and Thermosetting Plastic with detailed explanations and examples. Resist corrosion and are resistant to many chemicals. What Policies Can Help Students Affected by COVID-19? We should, therefore, not wear synthetic clothes while working in in the kitchen or in a laboratory. Do Not Burn Plastic and Synthetic Fabrics. K) Melamine is the organic compound with the formula C₃H₆N₆. Stuck At Home? Bakelite Structure. I need your help. Generally, people love to wearing polyester shirts and other dresses. We should develop habits which are environment friendly. A. Bakelite B. Melamine C. Branched D. Poly-vinyl chloride 9. These are used for manufacturing toys, combs and various types of containers. MCQ Questions for Class 12 Chemistry with Answers were prepared based on the latest exam pattern. Will you help her? Which of the following characteristics does not affect the properties of plastics? a) Thermosetting plastics. Write down their some features. Bakelite and Melamine are the example of thermosetting plastic. Burning of plastics and synthetic fabrics produces lots of poisonous gases causing air pollution. “Despite being very useful, it is advised to restrict the use of plastic”. 2) Reuse: Resources can be reused wherever possible. “A lady went to a market to buy a blanket. An example is vulcanized rubber. This fibre was called rayon or artificial silk. 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. Melamine is a versatile material. This causes a great problem in the disposal of plastic waste. Download NCERT Books 2020-21 based on new CBSE Syllabus for session 2020-2021. Terylene is a popular polyester. The formation process of these two types of plastics also differs. Cotton is a natural polymer, called cellulose. Why do people choose this type of sweaters? 4) Recover: We can recover or restore the resources into their original state, wherever possible. Odd one out: choose the letter of the word that is not related from the other choices. It is used to make electrical switches and handles of utensils. The shopkeeper showed her blankets made up of acrylic fibres as well as made up of wool. For manufacturing synthetic fibres cutting of trees or killing of animals is not required and we can conserve our natural environment using synthetic fibres. Tamilnadu Samacheer Kalvi 7th Science Solutions Term 3 Chapter 3 Polymer Chemistry All organic compound comes to this category. The market value is extremely high, due to the retro feel and limited quantities of certain products. Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. 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. ) Collect and dispose of biodegradable and nonbiodegradable waste separately that of Silk reused wherever so! Act as building blocks are known as a “ material of thousand uses ” due to its applications! 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