9. Question 12. 10. It is widely used for making clothes, carpets, etc. (c) 1948 Write its uses and properties. Plasticity Answer: Synthetic fibres ____________ on heating. It contains 67% nitrogen and has fire retardant properties when mixed with resins due to the release of the nitrogen gas while burning. There are certain governmental and non-governmental organisations who educate the general public on how to make wise use of plastics and develop environment friendly habits. 15. Advantages of synthetic fibres are: Question 9. Question 4. 12. (d) What is plasticity? Melamine partially evaporates from the nylon 6-melamine (30%) composition, whereas the other part condenses giving 8% of solid residue at 450 °C. Your email address will not be published. 15. Question 2. Answer: Question 1. 9. Melamine is rich in nitrogen, a property that is similar to protein. Write uses of melamine plas... chemistry. These small crystals can also block the small tubes in the kidney potentially stopping the production of urine, causing kidney failure and, in some cases, death. Its help you to complete your homework. Answer: 6. Answer: (a) Cotton Cellulose. (d) rayon, Question 13. (a) layers Melamine foam is a special form of melamine resin. Do it yourself. 13. Some of the strategies for plastic waste management are: Question 1. (a) Two main types of fibres are natural and man-made fibres. Chapter 1. 1. fibres 7. Polyester could be blended with natural fibres to enhance its properties. 4. Required fields are marked *, You may use these HTML tags and attributes:
, KPL International Limited © 2016, All Rights Reserved. 9. Answer: Board – CBSE. Wood pulp is used to make 2. Melamine is also used as fire retardant additives in paints, paper and plastics. Fibres may be natural or ____________. Question 4. Give the name of a plastic used for making fibres. Answer: The government should ban the use of plastic bags. (a) It is used for making floor tiles, kitchenware and fabrics which resist fire. Use of plastics The resin is a versatile material that has a highly stable structure. If the plastics are disposed in drains, they choke the drains causing waterlogging. They are unaffected by most of the chemicals in normal conditions. The two uses of rayon are: Question 6. Answer: What are plastics? Nylon is used in toothbrushes, combs, etc. Polythene and polyvinyl chloride. Riya’s father got a transfer to another place. (d) jars, Question 17. 7. 19. Name the first fully synthetic fibre. Name some artificial fibres. It takes more than 100 years to decompose. Answer: (a) Answer: Melamine is a versatile material. 12. spinneret ____________ are made up of small repeating units, joined together through bonds in linear pattern. Rayon synthesised for the first time in ____________. Share 3. Question 11. Learn about the Structure, Properties, and Uses of Bakelite and How it is Made. Nylon is the strongest amongst all the synthetic fibres. TCC’s Melamine is an organic compound that is often combined with formaldehyde to produce melamine resin, a synthetic polymer that is fire resistant and heat tolerant. Answer: (b) Rayon Can you guess why? Answer: Which of the following are made from thermosetting plastic? Here you get easy solutions of Lakhmir Singh and Manjit Kaur Science solution Chapter 3 . (b) cross-linked arrangement of units in plastic. (a) Terrywool Name some objects made of plastics. (a) Containers, buckets, bottles, chairs, baskets, etc. It is fully synthetic polymer which is prepared from coal, water and air. (e) What values of Riya and Shweta are shown here? Aperson has to make a non-stick pan. (b) straws (b) Which fabrics are known to be skin friendly? (c) viscose Answer: 2. (d) spinneret, Question 10. 18mm outdoor usage first class veneer shuttering boards laminated plywood sheets melamine faced plywood. (a) Nylon Bakelite, Question 19. True What are the uses of bakelite and melamine ? A melamine fibre, Basofil, has low thermal conductivity, excellent flame resistance and is self-extinguishing; this makes it useful for flame-resistant protective clothing, either alone or as a blend with other fibres. True (d) Synthetic clothes are famous than natural clothes because they are light, durable, cheaper, easy to maintain, moth resistant and available in various colours. True It is used to make parachutes, tents, ropes, etc. Ester is sweet-smelling compound. 5. (d) Silk, Question 6. The property of materials by which they can be moulded into any shape is called (f) If plastics are burnt, they evolve oxygen gas. A device with holes which is used to make fibres is called ____________. (b) 1. Which of the following is synthetic fibre? Plastics are those substances which are mostly synthetic in nature. (d) False (b), II. Plastics that retain their plasticity on repeated heating are called This shows that organic waste are biodegradable whereas plastics are non-biodegradable. (b) cellulose We can reuse plastic bottles for storing dry food grains or a pen keeper, etc. False Question 2. (c) Rayon Synthetic fibres may be synthesised by two ways: Question 4. 13. wool Question 3. Question 13. Answer: They are very useful for saving our trees and animals as they are made up of chemicals. 11. Acrylic resembles ____________. If these plastics are swallowed by the innocent animals along with their food, they harm their di-gestive system which leads to their death. 6. 13. Rayon is the first man-made cellulose fibre. If the cloth catches fire it can be very disastrous. It is used to make socks and stockings as it is elastic. Electric wires are coated with—PVC——. Do it yourself. Dear Student, Please refer the answer given by Nitesh. It is used for making floor tiles,unbreakable kitchenware,ashtray and fire resistant fabric. (a) Acrylic I. Write the advantages of synthetic fibres. (c) Synthetic clothes emits poisonous gases on burning. Here you can read Chapter 3 of Class 8 … —–synthetic——-fibre on burning, smells like burning paper. (b) wrinkle free Find out organisations in your area which are carrying out awareness programmes. Which of the following polyester is made by blending polyester and cotton? But her friend Shweta suggested to donate it to some charity house so that it can be reused. Which plastic will he use for coating and why ? Answer: Which of the following fibre has highest tensile stren 7. What is cellulose? The three properties of plastics are: Question 13. NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12, Question 1. He has three types of plastic-Bakelite, Teflon and PVC. (c) bottles Rayon is a man-made fibre which is produced by the chemical processing of wood pulp, i.e., a natural substance. Magic erasers are a powerful cleaning tool that you can use to remove stubborn marks from hard surfaces all around your house. Question 10. It was made in 1931 for the first time. They make versatile materials but are very dangerous to the environment. Melamine was initially found in food stuffs exported to the USA in early 2007 contained in contaminated wheat gluten and rice protein and had resulted in the death of several pet dogs and cats. (e) Riya is ignorant and non-ecofriendly whereas Shweta is insightful and eco-friendly. Melamine is an organic compound which on combining with formaldehyde forms a very durable thermosetting plastic. Answer: This is actually a disadvantage with synthetic fibres. 4. Write some advantages of synthetic fibres. Why? Answer: Question 8. → They are light, strong, and durable. (a) Answer: Polycarbonate is used to make 3. (b) elasticity These gases destroys the ozone layer of the earth and also pollute the environment. It is a leading producer of chemicals in India with over five decades of experience. Bakelite and melamine. 12. If plastics are burnt, they evolve poisonous gases. Cotton, Question 2. Answer: Question 3. ‘Plastics are hazard to environment’. Plastics are non-reactive. 13. (d) Write some properties and uses of melamine. They do not get heated up like metals. 4. Melamine pyrophosphate like dimelamine phosphate 27 gives about 15% of thermostable char. (c) Shoes Answer: 14. Cotton is a natural polymer. Grasim India, Question 8. 2. Fill in the Blanks Answer: 8. Synthetic fibres do not absorb much ____________. (b) petroleum 13. Answer: It resists fire and can tolerate heat better than other plastics. Answer: The shopkeeper showed her blankets made of acrylic fibres as well as made of wool. The common varieties of polyester are: Question 4. Which of the following is a thermoplastic? 15. It is used for making floor tiles, kitchenware and fabrics which resist fire. Biodegradable plastics are being developed from plant materials such as ____________ and ____________. If use of plastics are not reduced, our earth would turn into a big garbage bin. True or False Make a short report and submit it to your teacher. It results in a concrete with higher mechanical strength and a lower porosity, exhibiting a longer lifetime and an improved resistance to corrosive environments. (b) 1964 She decided to make some items like pen keeper, purses, toys, etc., using old fabrics and plastics. What is rayon? (b) Rayon Match the following Plastics should be recycled to make other useful products which do not harm the environment. ____________ is an example of thermosetting plastics. it is used for coating the outer surface of the utensils so that they do not catch fire and no damage occurs. It resists fire and can tolerate heat better than other plastics. (c) 17. Answer: (d) Blanket made of acrylic is cheap, durable, light in weight, available in variety of colours and provide the same warmth as that of wool. By using entirely chemicals and chemical reactions, like in nylon. Answer: Protein. (b) melamine False (b) How can we reuse any plastic items? They are cheaper in cost as compared to natural fibres. Answer: Question 1. Fill in the blanks with suitable word/s. http:/ /www.pslc.ws/macrog/index.htm Nylon, terylene, PET, acrylic, teflon, etc. Answer: 10. They specialize in the distribution and marketing of quality products in India, mainly in the field of paper, paper chemicals, chemicals, and polymers, sourced from global acclaimed manufacturers. 14. water List any two properties of rayon. Which of the following is known as artificial silk? One of the biggest Melamine supplier in India is KPL international limited which is established about two decades ago. 4R’s stands for Redue, Reuse, Recycle and Recover. Digital NCERT Books Class 8 Science pdf are always handy to use when you do not have access to physical copy. Answer: 14. Students who are in Class 8 or preparing for any exam which is based on Class 8 Science can refer NCERT Science Book for their preparation. List any three properties of plastics. Answer: Nylon Furthermore, some filters are made out of porous melamine. Text Book – SCIENCE. Is using plastics for storing food safe? (d) all of these, Question 5. Name the basic component of animal fibres. (b) If you wish to know more about fibres and plastics and the products made from them, you may explore the following website: Mark them as A and B respectively. Answer: 9. Name a natural fibre. 5. (b) Melamine is a plastic which can tolerate heat better than other plastics and resist fire. Plastics are corrosive in nature. (c) thermal plastics (d) 2. Answer: It provides ample of services and E2E business solutions to their customers. The major problems due to plastics are: Question 8. Melamine is sometimes added to food products to illegally increase the apparent protein content. 3.2 Types of Synthetic Fibers Rayon 3.3 Characteristics of Synthetic Fibers 3.4 Plastics 3.5 Plastics as […] Question 1. Looks and feels like fine porcelain and ceramic Melamine is a versatile material. Answer: Lakhmir Singh Science Class 8 Solutions Chapter 3 Synthetic Fibres And Plastics provided here is prepared by subject experts, according to the latest CBSE syllabus. (b) thermoplastics (c) Silk Question 12. Answer: (d) monomers, Question 11. Melamine can be manufactured from 11. Biodegradable, Question 17. MEDIUM. 4. Melamine is also used as fire retardant additives in paints, paper and plastics. The synthetic fibres melt on heating. (b) molecules 2. She donated these in a charity. It finds uses as an insulating and soundproofing material and more recently as a cleaning abrasive. What is 4R’s? Nylon, Question 20. (d) Jammu & Kashmir has banned the use of plastic bags. (a) Is it practical to say completely ‘NO’ to plastics? 7. (c) State whether the given statements are true or false. NCERT Solutions for Class 8 Science Chapter 3 Synthetic Fibers and Plastics Topics and Sub Topics in Class 8 Science Chapter 3 Synthetic Fibers and Plastics: Section Name Topic Name 3 Synthetic Fibers and Plastics 3.1 What are Synthetic Fibers? Give some examples of thermoplastics. 7. Answer: Polymers are compounds that are made up of same, small repeating units, joined together through bonds in a linear pattern. They are manufactured by the consumption of a large amount of petroleum. Next Next Chapter 4 >> Class 8 Science Question-answers. In which year was nylon made? KCI has two chemical manufacturing plants, One is in Ankleshwar of Gujarat state, which produces Alcohols and other Alcohol based chemicals and the second one in Vishakhapatnam of Andhra Pradesh which produces Hexamine and Formaldehyde. 8. We should not throw plastic wastes in water bodies. KPL International Limited has over 3000 customers with its ISO 9001 qualification and specialization in sourcing, distribution and marketing. Following are the properties of plastics: Question 5. Here we give Chapter 3 all solution of Class 8. Melamine is a name used both for the chemical and for the plastic made from it. CLH report Proposal for Harmonised Classification and Labelling Based on Regulation (EC) No 1272/2008 (CLP Regulation), Annex VI, Part 2 International Chemical Identification: 1,3 Terrycot: It is made by blending polyester and cotton. While sorting out the things Riya found many of her clothes of various fabrics were not fitting her or worn-out. Answer: 11. Bakelite and melamine are thermoplastics. Observe both the beakers after one or two months. Answer: 6. Answer: (c) PVC Question 1. (a) Bottles Though storing and carrying food in plastic container is more efficient. Cellulose is a polymer made up of large number of glucose units. Question 5. Which fibre is used as artificial wool? Devise an activity to show that organic waste is biodegradable while plastic is not. Nylon is used in combs and toothbrushes. Polyester is used for finishing on guitars and pianos. (c) Biodegradable 2. You may need consider between hundred or thousand products from many store. (b) Silk Piku is very fond of art and craft. What are thermosetting plastics? She preferred to buy an acrylic blanket. (b) Melamine alone causes bladder stones in animal tests. True Lakhmir Singh and Manjit Kaur Science solution: Synthetic Fibres and Plastics Chapter 3. The foam products can be used for removing scuffs and dirt from a wide range of surfaces. Children may be given an option to role play as manufac¬turers of synthetic fabrics or those of fabrics from natural sources. Question 14. Rayon, Question 5. (c) starch England, Question 6. (d) none of these, Question 4. Plastics are non-biodegradable, i.e., they do not get decomposed by microorganisms. Question 5. False So they are available in all possible shapes and sizes. Q Squared's restaurant-grade melamine can withstand the rigors of everyday use and is also more resistant to scratch marks and use and abuse over time. 8. 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In which synthetic fibres and plastics Class 8 Chapter 3 as per NCERT Book used microwave... Gives about 15 % of thermostable char using bags made of—jute—-or—paper—- instead of polythene bags are to! I suitably with those given in column I suitably with those given in column II still. Is called ____________ garbage bin true or False explanation of Class 8 reused! Mature and eco-friendly: “ say no to plastics make apparels like,. Absorb less water and air silk when silk got deficient during World War for. Plastic will he use for coating and why melamine faced plywood blending polyester wool. Fire in the beaker purses, toys, etc., using old fabrics and commercial filters apparels like,! With its ISO 9001 qualification and specialization in sourcing, distribution and marketing oxygen... Biodegradable ( d ) silk ( d ) Cotton ( c ) Nylon ( d Cotton! Lesson covers the complete explanation of Class 8 Science pdf are always handy use! 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