Question 7. Explain how, the use of plastics has a bad effect on the environment. Thermoplastic materials are made of polymers which are linked by intermolecular forces, forming linear or branched structures. A. nylon A combination of two different initiators is often used to give a uniform rate of polymerization. Answer: Answer: [2] The natural physical appearance of Bakelite is a brown/amber iridescent lustre. Vulcanised rubber is a thermosetting polymer which is used to make tyres. Question 58. Polythene is a thermoplastic polymer. 13. Question 53 A. It is used to make electrical switches and handles of utensils. Answer: It can also be dyed in a variety of colours. These are made by mixing two types of fibres. Name the units of which cellulose polymer is made. It remains crisp and easy to wash. Presented here are the properties and other uses of Bakelite you should know about. Hence, it is suitable for making dress material. It is used for making bottles and utensils which is replacing materials like glass. They melt on heating. Cotton is a natural fibre. Acrylic is a synthetic fibre which appears to resemble wool. Rayon is obtained by the chemical treatment of wood pulp or cellulose. Answer: Plastic is non-reactive.
It can be easily moldable and can be shaped in any form. It is used to make electrical switches and handles of utensils. Answer: Control stray cords. It is used for making sweaters and tracksuits and also for the linings of boots and gloves. Question 49. Explain how, manufacturing of synthetic fibres is actually helping in the conservation of forests. Answer: The plastics which when moulded once, cannot be softened by heating are called thermosetting plastics. D. polyester Answer: It is flexible, resistant to moth, oil and chemicals. Esters are the chemicals which give fruits their smell. Question 76. D. polyvinyl chloride B. How do carelessly thrown plastic bags (polythene bags) affect: What are the various ways to save the environment from excessive plastic wastes? Rayon is obtained by the chemical treatment of wood pulp or cellulose. Water resistant. Plastics cannot be burnt because they release poisonous gases. We must develop the habits which are environment-friendly. Silk is the strongest fibre whereas wool is the weakest in terms of strength. It was petrochemicals which is derived from fossil fuels Bakelite, trademarked synthetic resin invented in 1907 by Belgian-born American chemist Leo Hendrik Baekeland. The disposal of plastic wastes is a major problem because of the following reasons: Question 47. It is used to make electrical switches and handles of utensils. B. acrylic For example, polycot is a mixture of polyester and cotton. Which of the following are thermosetting polymers? (i) Polyester – (d) Fabrics do not wrinkle easily Question 78. Question 77. Answer: It is cheaper than silk but can be woven like silk fibres. Answer: Nylon is used in textile industry to produce clothes. Create custom Assignments. Answer: Which of the following is not a thermoplastic polymer? (e) for making electric switches? One of the following man-made fibre is not prepared from raw materials obtained from petrochemicals. Melamine is a thermosetting plastic. Question 66. (i) terylene could be the synthetic fibre B which contains a large number of ester groups. Question 9. B and C It is because of the unique properties it possesses. It was also used for patriotic wartime jewelry. (ii) Rayon could be the synthetic fibre C which is made of polymer D containing glucose. B and C Answer: Give two examples of thermosetting plastics. Answer: Answer: Telephone instruments, Cooker handles, Electric switches and Ball point pens are made of Thermosetting plastics. PVC is a thermoplastic. In case of thermoplastics, the shape hardens when it is cooled, but can be reshaped when heated up again. In order to achieve this, we must not throw plastic in the water bodies or on the roads. The arrangement of units in a plastic can be linear or cross-linked. Plastics can take several years to decompose. PET is a very familiar form of polyester. It is used to make floor tiles, kitchenware and fire resistant fabrics. Synthetic fibres such as nylon or polyester are different from the natural fibres. We should buy cotton shirts to wear in summers. How is rayon made? Frying pan handles are made with thermosetting plastics which are resistant to fire and can tolerate heat better than other plastics. On the other hand, thermosetting plastics are those materials that are made by polymers joined together by chemical bonds, having a highly-crosslinked polymer structure. It is a synthetic fibre which appears to resemble wool. Answer: Due to its excellent insulating properties it is used for making switches and other electrical appliances. Hence, it became very popular for making clothes. This is can be reduced by use paper or jute bag. Plastic is light, strong and durable and can be moulded into different shapes and sizes. C. polyester It is used in the following ways: Question 25. Should the handle and bristles of a toothbrush be made of the same type of plastic material? Following are the properties of nylon: Question 19. For example, polythene and PVC are thermoplastics. Hence, we should not wear synthetic clothes while working in a kitchen or working in a laboratory. These are used in the manufacturing of toys, combs and different types of containers. Rayon is obtained by the chemical treatment of wood pulp or cellulose. (a) dirty water drains and sewers? Question 13. The arrangement of units in a plastic can be linear or cross-linked. Example: Rayon and Nylon are synthetic fibres. The reaction involved is condensation reaction in the presence of either a basic or acidic catalyst. Question 3. Answer: Question 14. These units are made of chemical substances. For example, Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. D. rayon The raw materials for natural fibres are mainly derived from plants and animals. B. rayon (b) petrochemicals, Nylon was the first fully synthetic fiber. (e) Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. It is used for making bottles and utensils which is replacing materials like glass. Which of the two is a thermosetting plastic: PVC or bakelite? Answer: D. Teflon Question 51 B. This is because cotton absorbs sweat from our body and allows it to evaporate into the air. A synthetic fibre is made of small units which are joined together. A. polyvinyl chloride PVC is a thermoplastic. Answer: Which of the following is a man-made fibre prepared from wood-pulp? Question 50. A. flax The synthetic polymer which can be used as a substitute for wool for making sweaters and shawls, etc. (a) Plastic is non-biodegradable. Cellulose is made up of a large number of glucose units. The bakelite bubble was first prepared in the early 1920s. (C) Polythene 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. For example, Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. A. bakelite (d) Fabrics do not wrinkle easily Answer: (b) Used for making parachutes (b) Name the polymer D. High-Density Polyethylene (HDPE 2), Low-Density Polyethylene (LDPE 4), Difference Between Coronavirus and Cold Symptoms, Difference Between Coronavirus and Influenza, Difference Between Coronavirus and Covid 19, Difference Between Lenovo S2 and Samsung Galaxy S2 (Galaxy S II), Difference Between Kinetic Energy and Potential Energy, Difference Between Exorcism and Deliverance, Difference Between Bactericidal and Bacteriostatic, Difference Between Colonialism and Imperialism, Difference Between 5 HTP Tryptophan and L-Tryptophan, Difference Between N Glycosylation and O Glycosylation, Difference Between Epoxy and Fiberglass Resin, Supermarket bags, plastic bottles (Inexpensive), Detergent bottles, milk jugs, and molded plastic cases, Plumbing pipes, shower curtains, window frames, flooring, Bottle caps, drinking straws, yogurt containers. What is polyester? The arrangement of units in a plastic can be linear or cross-linked. Question 38. C. terylene The synthetic fibre A is chemically a polyamide whereas the synthetic fibre B contains a large number of ester groups. Thermoplastics gets deformed easily on heating and can also be bent easily. Polyester is the synthetic fibre which is made up of repeating units of a chemical called an ester. Terylene is a kind of a polyester. Question 40. It releases lots of poisonous fumes into the atmosphere when burned and causes air pollution. (D) Bakelite Such small units combine to form a large single unit called a polymer. Thermosetting plastics are those materials that are made by polymers joined together by chemical bonds, having a highly-crosslinked polymer structure. Thermosetting plastics: The plastics which when moulded once, cannot be softened by heating are called thermosetting plastics. For example, cotton is a natural polymer which is made from the cellulose. 40) State two uses of melamine ? B. rayon We must not throw plastic in the water bodies or on the roads. For example, Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. is: It causes environmental pollution. Toys and jewelry were most often made from either Catalin or Faturan, but were marketed as bakelite because they used the polymer resin base. Also, the burning process of synthetic material is quite slow and it does not get completely burnt easily. C. A and D Refrigerator liners, food packaging, vending cups. Terms of Use and Privacy Policy: Legal. Is it thermoplastic or thermosetting plastic? D. acrylic Question 10. Polythene, PVC- Poly vinyl chloride, bakelite and melamine are the examples of different plastics. It causes environmental pollution. The clothes of a person working in the kitchen catch fire accidently causing severe burns. Question 17. (f) for making flexible water bottles? Question 60. (b) Nylon is a polyamide. It is used for making bottles and utensils which is replacing materials like glass. Polythene is a thermoplastic. Synthetic fibres become more popular than natural fibres because they are cheaper than natural fibres. Polythene, PVC- Poly vinyl chloride, bakelite and melamine are the examples of different plastics. C. terylene Its tangled polymer chains can uncoil and slide past each other, making it a flexible material. D. Acrylic, Silk, Wool. Its tangled polymer chains can uncoil and slide past each other, making it a flexible material. PET is a form of polyester. Give one use of Teflon. Question 34. Explain why, the disposal of plastic wastes is a major problem. Fill in the following blanks with suitable words: For example, tin, aluminium and other metal cans and plastics are non-biodegradable materials. Question 2. Rayon is the man-made fibre prepared from the natural materials. A. it has a silk-like appearance Answer: It is used for making carpets and fabrics in textile industry. B and C In order to achieve this, we must try to do the following: Question 51 A. They melt on heating. Give one use each of bakelite, nylon and acrylic. Answer: Which of the following plastic objects can be recycled? Economical, versatile polyvinyl chloride (PVC, or vinyl) is used in a variety of applications in the building and construction, health care, electronics, automobile and other sectors, in products ranging from piping and siding, blood bags and tubing, to wire and cable insulation, windshield system components and more. (B) Polythene bag Answer: (D) Ashtray (D) Bakelite It can also be used to make fur and many different knitted clothes. Acrylic is used as a substitute of natural wool for knitting sweaters, blankets etc. These articles can be recycled. Bakelite or polyoxybenzylmethylenglycolanhydride was the first plastic made from synthetic components. Answer: An Overview of its Properties and Uses. Cellulose polymer is made from the repeat units of the monomer glucose. Polyester is the synthetic fibre which contains the organic group similar-to those which give fruits their sweet smell. (d) paper or jute bag Disposal of plastic is a major problem. We must take a cotton carry bag or a jute bag while shopping. Temperature and sunlight may also play roles in the decomposition of biodegradable plastics and other materials. The fibres are arranged in terms of strength in the following way: Wool, Cotton, Polyester, Nylon, Silk. Answer: Nylon fibre is very strong, elastic and light. Which of the following plastics do not have cross-links between their polymer chains View Answer. C. acrylic State the various ways in which we can avoid (or minimize) the use of plastics. It is used for making parachutes and rock climbing ropes. 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. Answer: Question 80. Give two uses of PVC. B. nylon Which of the following plastics is used for making electric switches? Name the fibre obtained by the chemical treatment of wood pulp (or cellulose). D. both are cellulose polymers They cannot be reshaped. Draw labelled diagrams to illustrate your answer. The introduction of Bakelitethe worlds first synthetic plasticin 1907 marked the introduction of the Polymer Age. Once having a wide variety of uses… Answer: It was prepared from coal, water and air.
The first is the emission of toxic and corrosive gases when melting the material. C. terylene Rayon is different from truly synthetic fibres because: It takes several years for plastic to decompose and it is not environment friendly. It is used for nonstick coating on cook wares. Thermoplastics: The plastics which gets deformed easily on heating and can be bent easily are called thermoplastics. Thermosetting plastics: The plastics which when moulded once, cannot be softened by heating are called thermosetting plastics. Centuries later the Iron Age introduced iron as the material of choice. Answer: The plastics which when moulded once, cannot be softened by heating are called thermosetting plastics. Some 5,000 years ago, we learned how to make alloys of copper, and the Bronze Age began.
Question 52 B. For example, we must use a steel lunch box or steel containers instead of plastic ones. C. terylene (iii) Rayon – (a) Prepared by using wood pulp C. rayon The handle of toothbrush should be hard and strong whereas the bristles should be soft and flexible. It played a large role in bringing electronics into the automobile industry because it is heat and electricity resistant. Answer. Polyethene, PVC, Bakelite and melamine are the four different types of plastics. 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. Give any two uses of rayon. Nylon fibres is very strong, elastic and light. They are readily available and are easy to maintain. It is lustrous and easy to wash. Answer: Therefore, we must avoid the use of plastic as much as possible. Plastic is a polymer like a synthetic fibre. Polycot, poly wool and terry cot are popular polyesters. (c) Bakelite is used for making handles of frying pans. Answer: (B) Terylene PVC, Polythene, Bakelite. The plastics which cannot be softened by heating, when moulded once are called thermosetting plastics. (A) Melamine B. melamine When thrown in the water drains or in sewers it results in choking of the drains. As a result, they are not used for making frying pan handles. Characteristics and uses. D. Bakelite Answer: (a) man-made or artificial, Rayon and nylon are the examples of synthetic fibers. The fabric will melt and can stick to the body of the person wearing it causing severe burns. B. melamine What are thermoplastics? It causes environmental pollution. Answer: Bakelite is used for making plugs and switches. It is the man-made fibre which is regarded as artificial silk. Question 69. B. silk C. nylon (d) The fibre B which is terylene contains the same type of groups as those in a PET jar. [MSE (Chandigarh)] Answer: Three advantages of polythene over natural materials are : It is strong but flexible. Phenol-Formaldehyde Resin (Bakelite). (i) Polyester It is the man-made fibre which is regarded as artificial silk. We must take a cotton carry bag or a jute bag while shopping. to highly specialized uses in aircrafts, ships, space crafts, healthcare, etc. Answer: C. Teflon A. Teflon It is obtained by the chemical treatment of wood pulp or cellulose. PET is a very familiar form of polyester. (d) for making insulation of electric wires? They do not have cross-links between their polymer chains. (iii) Nylon could be the fibre A which is chemically a polyamide is nylon. Name any five commonly used articles made of plastics. It is therefore, safe to keep food in plastic containers. The materials which are not easily decomposed by natural processes are called non- biodegradable materials. It is flexible, resistant to moth, oil and chemicals. Answer: Question 31. Answer: Which synthetic fibre contains the organic group similar-to those which give fruits their sweet smell. It is highly durable and is used for making seatbelts and tire cords. Ans: Two uses of Bakelite is. State two uses of melamine. Melamine and Bakelite are thermosetting plastics. B. Fabrics made from polyester does not get wrinkled easily. Frying pan handles are made with thermosetting plastics which are resistant to fire and can tolerate heat better than other plastics. Rayon is obtained by the chemical treatment of wood pulp or cellulose. It takes several years for plastic to decompose. Polythene is a thermoplastic polymer. (A) Nylon State one disadvantage of using synthetic fibres for making clothes. Which of the two is a thermosetting plastic: PVC or bakelite? Give the name of both monomers used the formation of terylene. Thermoplastics: The plastics which gets deformed easily on heating and can be bent easily are called thermoplastics. Answer: Plastics can be used in healthcare in the following ways: Question 43. To which kind of synthetic fibres does terylene belong? We must try to Reduce, Reuse, Recycle and recover the use of plastic items. Answer: Which of the following articles made of plastics ‘can be recycled’ and which cannot be recycled’ ? Answer: Question 1. A and B Hence, the manufacturing of synthetic fibres helps in the conservation of forests. Nylon is the first fully synthetic fibre. For example, polythene and PVC are thermoplastics. Question 71. Bakelite was invented in the early twentieth century but it is an important topic of study even in this 21st century. It is used in nonstick cooking vessels. Due to such unique properties, synthetic fibres are used to make dress materials. Hence, a polymer is made of many repeating units. Answer: It takes several years for plastic to decompose and it is not environment friendly. give reasons for your choice? Plastic bags thrown in the garbage can be swallowed by the animals such as cows. It can also be mixed with wool to make carpets. A material which is not easily decomposed by natural processes is termed as non-biodegradable. Question 55. It is used to make floor tiles, kitchenware and fire resistant fabrics. Question 56. Polyester is the synthetic fibre which contains the organic group similar-to those which give fruits their sweet smell. The man-made fibre which contains identical to: What is Bakelite Plastic? Question 41. (a) Terylene and PET are polyesters. Bakelite Bakelite was the forerunner of the modern plastics industry. After the polymer has grown by about 10x, the short polymer precipitates inside the droplet of VCM, and polymerization continues with the precipitated, solvent-swollen particles. 3 Polyethylene (PE), 4 polyvinyl chloride (PVC), 5 epoxy resin, and phenolic foams 6 were prepared in the 1940s. The raw materials for synthetic fibres are mainly petrochemicals such as coal. It is used to make floor tiles, kitchenware and fire resistant fabrics. B. polythene Uses of Bakelite. For example, cotton is a natural polymer which is made from the cellulose. 2)It was also used in other diverse products such as jewellery, kitchenware, and toys. A. nylon These materials are not environmental friendly and cause environmental pollution. B. polyester Explain the difference between thermoplastics and thermosetting plastics. D. rayon Question 5. Bakelite is a thermosetting plastic. 2) It is harder than other plastics. B. 14. Over a 50 year period, this material has demonstraced its ability to met the demanding requirements of the healthcare industry. The manufacture of one of the following artificial fibres contributes to deforestation this fibre is : Melamine is a thermosetting plastic which is resistant to fire and can tolerate heat better than other plastics. It is also used for making parachutes and ropes for rock climbing. (f) PET is used for making flexible water bottles. D. cotton It is used to make electrical switches and handles of utensils. Question 59. (b) which materials is a polyamide? Plastic is non-biodegradable. Question 44. Plastic is non-biodegradable. Rayon is obtained by the chemical treatment of wood pulp or cellulose. It was prepared from coal, water and air. C. terylene another synthetic fibre C is made of a polymer D which consists of a number of glucose units joined one after the other. It is the first fully synthetic fibre. PET is a very familiar form of polyester. Give one use of Teflon. The plastics which gets deformed easily on heating and can be bent easily are called thermoplastics. Question 70. Polymers also occur in nature. (b) Plastic bags thrown in the garbage can be swallowed by the animals such as cows. The full form of PVC is polyvinyl chloride. Telephone instruments, plastic toys, cooker handles, plastic covering on electrical wires, electric switches, ballpoint pens, carry bags, plastic bottles, plastic chairs Esters are the chemicals which give fruits their smell. Acrylic is a synthetic fibre which appears to resemble wool. It is used widely in making electrical goods such as switches, plugs, handles of various utensils. Customize … USES OF BAKELITE: Bakelite due to its high resistance to electricity and heat is used in automotive components and industrial applications. B. flax It was prepared from coal, water and air. Answer: Which of the following is not a synthetic fibre? 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