The reaction involved is condensation reaction in the presence of either a basic or acidic catalyst. It was prepared from coal, water and air. (d) for making insulation of electric wires? Question 28. The plastic which is coated on the uniforms of firemen to make them fire-resistant is: Question 62. It is used to make electrical switches and handles of utensils. Rayon is obtained by the chemical treatment of wood pulp or cellulose. (a) for making uniforms of fire-men fire resistant? (iv) Nylon Cellulose is made up of a large number of glucose units. Give one use of Teflon. It is used in the following ways: Question 25. Which of the following plastic objects can be recycled? We must develop the habits which are environment friendly. Answer: Polythene is a thermoplastic polymer. Making electric fittings such as electric switches, Making plugs and sockets. Question 17. C. rayon View Answer. Teflon is a special plastic on which oil and water do not stick. It takes several years for plastic to decompose and it is not environment friendly. Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Filed Under: Chemistry Tagged With: Bakelite, Bakelite and Plastic differences, Bakelite characteristics, Bakelite Chemical Structure, Bakelite properties, Bakelite uses, Bakelite vs Plastic, Compare Bakelite and Plastic, Plastic, Plastic characteristics, Plastic Chemical Structure, Plastic properties, Plastic uses. Polycot, poly wool and terry cot are popular polyesters. (d) Fabrics do not wrinkle easily Modern healthcare would not be possible without the use of plastic materials. Question 53 B. C. A and D The fact that Bakelite is unaffected by heat in this way classifies it as a thermoset. Name the fibre used for making parachutes and rock climbing ropes. History is shaped by the materials we develop and use. Answer: Resin products no better than bakelite from a health viewpoint are used everywhere these days. They are readily available and are easy to maintain. It causes environmental pollution. State the important properties of nylon. VIEW MORE. to highly specialized uses in aircrafts, ships, space crafts, healthcare, etc. Terylene is a synthetic fibre. View Answer. Question 39. The synthetic fibre which contains the group similar to those which give fruits their ‘sweet smell’ is: These are used in the manufacturing of toys, combs and different types of containers. Rayon is the man-made fibre which is regarded as artificial silk. Answer: We must develop the habits which are environment friendly. Hence, it became very popular for making clothes. Rayon is obtained by the chemical treatment of wood pulp or cellulose. It played a large role in bringing electronics into the automobile industry because it is heat and electricity resistant. (c) Like synthetic fibres, plastic is also a ………… If the clothes made of synthetic fibres catch fire, it can be very dangerous. Answer: The most widely used thermoplastic material in the medical device industry is PVC. D. acrylic It is used for nonstick coating on cook wares. A. It is used for making bottles and utensils which is replacing materials like glass. Should the handle and bristles of a toothbrush be made of the same type of plastic material? These materials are not environmental friendly and cause environmental pollution. Some of the plastic structures are drawn below. (c) which material is used as a substitute for wool? Why should we not wear clothes made of synthetic fibres (like nylon or polyester) while working in the kitchen? Question 15. Polyethene, PVC, Bakelite and melamine are the four different types of plastics. It was made in 1931, without the use of any natural raw material from plants or animals. products), and this can be attributed to its highly versatile nature. They are just cheaper to make. It is the man-made fibre which is regarded as artificial silk. (b) Polymer D is Cellulose. Answer: "The Material of a Thousand Uses" Bakelite's properties make it suitable for several uses including a molding compound, binding agent, varnish, and protective coating. What are thermosetting plastics? C. A and C It is also used for making uniforms of fire-men. Answer: Answer: Polyvinyl Chloride for Prototype Development on CNC Machines, 3D Printers, & Injection Molding Machines: There are two main issues working with PVC that make it fairly problematic and not generally recommended for use by non-professionals. Answer: Nylon has the ability to show variation of luster. Plastic: All the plastic materials are organic polymers with a repeating unit called monomer. Bakelite Bakelite was the forerunner of the modern plastics industry. [NCERT] 1. Answer: B. acrylic (B) Nekamine (b) Nylon is a polyamide. Plastics cannot be burnt because they release poisonous gases. Rayon is obtained by the chemical treatment of wood pulp or cellulose. Explain why, thermoplastics become soft on heating but thermosetting plastics do not become soft on heating. These are made by the reaction of phenol and formaldehyde in basic medium. A. Bakelite (c) Used to make non- stick cookware It has the ability to be very lustrous, semi lustrous or dull. It also discourages the growth of bacteria and does not cause any skin allergies. Write some of the uses of plastics in healthcare industry. Such small units combine to form a large single unit called a polymer. Question 14. It is flexible, resistant to moth, oil and chemicals. Answer: It is used for making gaskets, pump packings, valves, seals etc. Question 14. Terylene is a kind of a polyester. Question 42. (c) Which fibre (A, B or C) is prepared from a natural raw material? Which of the two is a thermosetting plastic: PVC or bakelite? The clothes of a person working in the kitchen catch fire accidently causing severe burns. Synthetic fibres are man-made fibres which are made up of small units which are joined together. Give two uses of PVC. We must take a cotton carry bag or a jute bag while shopping. We must take a cotton carry bag or a jute bag while shopping. Centuries later the Iron Age introduced iron as the material of choice. is: Question 71. D. acrylic For example, polythene and PVC are thermoplastics. Polyester is the synthetic fibre which contains the organic group similar-to those which give fruits their sweet smell. Choose the thermoplastics and thermosetting plastics from the following: Melamine, Polythene, Bakelite, Polyvinyl chloride Bakelite, trademarked synthetic resin invented in 1907 by Belgian-born American chemist Leo Hendrik Baekeland. Rayon is the man-made fibre prepared from the natural materials. It is lustrous and easy to wash. Rayon is obtained by the chemical treatment of wood pulp or cellulose. Rayon is obtained by the chemical treatment of wood pulp or cellulose causing deforestation. D. it can be dyed in wide variety of colours. Chemical Structure of Bakelite and Plastic: Difference Between Polymer and Biopolymer, Difference Between Polycarbonate and Plastic. The plastics which when moulded once, cannot be softened by heating are called thermosetting plastics. It is used for making carpets and fabrics in textile industry. (d) which material is used as a substitute for glass? Synthetic fibres such as nylon or polyester are different from the natural fibres. Bakelite is a thermoset plastic, meaning that its polymer chains are hooked together through the heat and pressure applied when it is molded. For example, Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. Nylon and Terylene are thermoplastic polymers. Melamine is a thermosetting plastic. Why have synthetic fibres become more popular than natural fibres? Nylon is the first fully synthetic fibre. Nylon is used in textile industry to produce clothes. B. It takes several years for plastic to decompose and it is not environment friendly. Answer: What are the various ways to save the environment from excessive plastic wastes? Answer: Such small units combine to form a large single unit called a polymer. (b) Plastic bags thrown in the garbage can be swallowed by the animals such as cows. It is known as one of the first synthetic plastics, derived from methanol and coal tar. The full form of PVC is polyvinyl chloride. C. terylene Cellulose is made up of a large number of glucose units. Answer: C. terylene Melamine is a thermosetting plastic which is resistant to fire and can tolerate heat better than other plastics. (e) for making electric switches? (adsbygoogle = window.adsbygoogle || []).push({}); Copyright © 2010-2018 Difference Between. Explain why, plastic containers are preferred for storing food. In order to achieve this, we must try to do the following: Question 51 A. Question 12. (C) Terylene Give any two uses of rayon. Thermoplastic materials are made of polymers which are linked by intermolecular forces, forming linear or branched structures. How do carelessly thrown plastic bags (polythene bags) affect: It is used to make electrical switches and handles of utensils. (a) Prepared by using wood pulp Terylene and PET are both polyesters. Question 3. (c) Bakelite is used for making handles of frying pans. The bakelite bubble was first prepared in the early 1920s. Answer: Nylon is the first fully synthetic fibre. A. nylon It is also used in textile industry to make textiles. Bakelite is a thermosetting plastic. Now coming to the uses of Bakelite, since this element has a low electrical conductivity and high heat resistance it can be used in manufacturing electrical switches and machine parts of electrical systems. D. melamine Answer: Teflon is a special plastic on which oil and water do not stick. The disposal of plastic wastes is a major problem because of the following reasons: Question 47. We must try to Reduce, Reuse, Recycle and recover the use of plastic items. Which of the following is not a thermoplastic polymer? Frying pan handles are made with thermosetting plastics which are resistant to fire and can tolerate heat better than other plastics. It is also used in making furnishing fabrics and carpets. Refrigerator liners, food packaging, vending cups. Answer: PVC was originally developed to replace the rubber and glass that was historically used to make flexible tubing and containers. For example, polythene and PVC are thermoplastics. C. rayon Bakelite was invented in the early twentieth century but it is an important topic of study even in this 21st century. Frying pan handles are made with thermosetting plastics which are resistant to fire and can tolerate heat better than other plastics. Answer: It is widely used in making household items including food containers. Although rayon is obtained from natural source, wood pulp, yet it is a manmade fibre. C. PET These units are made of chemical substances. What is acrylic? Following are the ways to save the environment from excessive plastic wastes: Question 48. B. melamine Answer: Its polymer chains are joined together by cross-links, so they cannot slide past each other easily. C. terylene Polymers also occur in nature. Give one use each of bakelite, nylon and acrylic. Hence, electric witches, plugs and sockets made of thermosetting plastics. B. rayon As a result, they are not used for making frying pan handles. It is used to make floor tiles, kitchenware and fire resistant fabrics. Explain how, the use of plastics has a bad effect on the environment. (b) Teflon is used for giving non-stick coating on frying pans. Rayon is obtained by the chemical treatment of wood pulp or cellulose. For example, Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. The synthetic polymer which can be used as a substitute for wool for making sweaters and shawls, etc. The fabric will melt and can stick to the body of the person wearing it. It is the man-made fibre which is regarded as artificial silk. It releases lots of poisonous fumes into the atmosphere when burned and causes air pollution. Plastics are used in the packaging of tablets, syringes, doctor’s gloves and a number of medical instruments. Question 77. Answer: It is used to make electrical switches and handles of utensils. For example, cotton is a natural polymer which is made from the cellulose. 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