Answer: What is rayon? The government should ban the use of plastic bags. (c) PVC (i) What are the uses of bakelite and melamine ? melamine is a thermosetting plastic and does not melts down on heating. Answer: 13. wool 11. (a) Nylon 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. Answer: False (d) all of these, Question 5. Plastics are non-corrosive in nature, i.e., they do not react easily with air and water. (a) (b) Cotton Write the advantages of synthetic fibres. 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. Melamine is a versatile material. But chemicals used for manu-facturing plastics leeches out into the food and contaminates it. Plastics are non-biodegradable in nature. Melamine is sometimes added to food products to illegally increase the apparent protein content. She preferred to buy an acrylic blanket. Bakelite and melamine are thermoplastics. Write some advantages of synthetic fibres. 7. Plastics are corrosive in nature. (a) (a) False Which of the following is synthetic fibre? 5. 10. 11. Which plastic will he use for coating and why ? Common variety of polyester is Mark them as A and B respectively. Here you can read Chapter 3 of Class 8 … (d) jars, Question 17. Wood pulp is used to make 13. It resists fire and can tolerate heat better than other plastics. 10. She donated these in a charity. Chapter – 3 However, similar behaviour with a more thermostable residue is shown by melamine cyanurate. Answer: 4. Question 3. It is used to make parachutes, tents, ropes, etc. They are manufactured by the consumption of a large amount of petroleum. Protein. 12. spinneret 10. KPL International Limited is an arm of Kanoria Chemicals & Industries Limited (KCI), which is a very diversified company with OHSAS 18001, ISO 14001 and ISO 9001 certification. (g) 1. Bakelite, Question 19. Answer: 14. Also mention the natural fibres which are used for blending to enhance their properties. 3.2 Types of Synthetic Fibers Rayon 3.3 Characteristics of Synthetic Fibers 3.4 Plastics 3.5 Plastics as […] (a) Bakelite We can reuse plastic bottles for storing dry food grains or a pen keeper, etc. Question 5. Polyester is used for finishing on guitars and pianos. (b) 1964 (b) molecules NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12, Question 1. You may need consider between hundred or thousand products from many store. (a) plastic Practicing 4R’s, i.e.,____________ ,____________, ____________ and ____________ should be encouraged. (c) 1948 If plastics are burnt, they evolve oxygen gas. I. Synthetic fibres do not absorb much ____________. It provides ample of services and E2E business solutions to their customers. They are cheaper in cost as compared to natural fibres. (a) durable What are the uses of polyester? True Melamine is rich in nitrogen, a property that is similar to protein. 10. cellulose, starch Its help you to complete your homework. Cover the wastes in both the beakers with soil. (b) Silk Uses of Nylon. 3. Write uses of melamine plastic. Synthetic fibres are moth and insect resistant. Finding your suitable readers for nicole miller home dynasty melamine appetizer plates is not easy. England Class-8 » Science. Answer: Plastics are those substances which are mostly synthetic in nature. Rayon is a man-made fibre which is produced by the chemical processing of wood pulp, i.e., a natural substance. (d) Answer: Melamine is a versatile material. (a) terylene (b) Synthetic fibres shrink a lot when washed. The property of materials by which they can be moulded into any shape is called Which of the following is known as artificial silk? Text Book – SCIENCE. (c) Rayon (c) Polyester 16. Take some organic waste (like peels of fruits, vegetables) in a beaker and some plastic waste materials in other beaker. But her friend Shweta suggested to donate it to some charity house so that it can be reused. Advantages of synthetic fibres are: Question 9. Answer: Plastics are non-biodegradable, i.e., they do not get decomposed by microorganisms. (d) Nylon, Question 9. Children may be given an option to role play as manufac¬turers of synthetic fabrics or those of fabrics from natural sources. Question 3. (d) All of these, Question 15. Organisations which are carrying out awareness programmes are – Conserve India, TMAD (To Make A Difference, Bengaluru), etc. 4. State whether the given statements are true or false. 17. (a) Rayon Answer: Organise a debate in the school. (a) linear arrangement of units in plastic. (a) Acrylic If use of plastics are not reduced, our earth would turn into a big garbage bin. (c) plasticity Explain the properties of plastics. Plastic that can resist fire is Answer: 2. 14. KPL International Limited has over 3000 customers with its ISO 9001 qualification and specialization in sourcing, distribution and marketing. (d) Digital NCERT Books Class 8 Science pdf are always handy to use when you do not have access to physical copy. 4. (c) cells In this article, we make a short list of the best readers for nicole miller home dynasty melamine appetizer plates including detail information and customer reviews. Answer: (a) layers Melamine is also used as a fertilizer due to its high nitrogen contents; however, it is much costlier to produce than other nitrogen fertilizers like urea. Melamine is categorized under Class #7 on the list of Plastic Resin Codes. 7. False (c) bottles Melamine is a plastic which can tolerate heat better than other plastics and resist fire. KPL International Limited also deals in automotive and industrial electronics, textiles and renewable energy. Practicing 4R’s principle, i.e., Reuse, Recycle, Reduce and Recover should be encouraged. Name a natural fibre. Question 10. Question 15. (e) Is using plastics for storing food safe? Answer: (c) Why we should not burn synthetic clothes? 9. Name a synthetic fibre which is polyamide. (b) Rayon Answer: Learn about the Structure, Properties, and Uses of Bakelite and How it is Made. Name some objects made of plastics. Question 3. Question 1. Thereafter, this contamination was found in many other products that use protein content as … ____________ fibre is stronger than steel wire of same thickness. She decided to make some items like pen keeper, purses, toys, etc., using old fabrics and plastics. (c) Synthetic clothes emits poisonous gases on burning. 10. Though storing and carrying food in plastic container is more efficient. Answer: They absorb less water and are quick to dry. Answer: 4. 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. (b) elasticity View More Information about: Melamine More Information about Buying, Selling and doing Business with Melamine Suppliers / Providers of Melamine … Answer: Do it yourself. Its uses include whiteboards, floor tiles, kitchenware, fire retardant fabrics and commercial filters. In which country was rayon first time synthesised? Thermosetting plastics are those which when moulded once, cannot be softened again and lose their plasticity. Rayon synthesised for the first time in England. It was made in 1931 for the first time. False Question 9. ____________ is the property of materials by which they can be moulded into any shape. (d) Why synthetic clothes are famous than natural fabrics? Can you guess why? 4R’s stands for Redue, Reuse, Recycle and Recover. Synthetic fibres may be synthesised by two ways: Question 4. Artificial silk is another name of ____________. Terrywool is made by blending polyester and silk. → They are light, strong, and durable. Answer: Features of Melamine Plastics: ... Foundation Chemistry Class 8 Chapter 1 & 2 part I. (c) thermal plastics ____________ are made up of small repeating units, joined together through bonds in linear pattern. 4. Though it is in very small amount but continuous use of it is exposing our body to harmful and poisonous chemicals. What are polymers? Observe both the beakers after one or two months. Blanket made of acrylic is cheap, durable, light in weight, available in variety of colours and provide the same warmth as that of wool. 2. Melamine foam is a special form of melamine resin. Electric wires are coated with—PVC——. Next Next Chapter 4 >> Class 8 Science Question-answers. Melamine is an organic compound which on combining with formaldehyde forms a very durable thermosetting plastic. Some of them are as follows: Question 3. Do it yourself. Have you heard of the campaign: “Say No To Plastics”. Nylon, terylene, PET, acrylic, teflon, etc. The synthetic fibres melt on heating. Question 1. Answer. Question 3. Which of the following is a characteristic of plastics? Nylon is used in combs and toothbrushes. 15. The resin is a versatile material that has a highly stable structure. Synthetic Fibres and Plastics Class 8 Science Chapter 3 as per NCERT Book used in CBSE and other Schools. 7. (c) jute Name the basic component of animal fibres. True (c) (b) Which fabrics are known to be skin friendly? Question 1. It is used to make apparels like shirts, blouses, etc. Answer: (a) Is it practical to say completely ‘NO’ to plastics? (d) 1950, Question 7. (a) What are the two main types of fibres? Answer: 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. (b) straws Answer: Question 2. Which of the following are made from thermosetting plastic? These gases destroys the ozone layer of the earth and also pollute the environment. It is a polymer of amides. Afterwards, this plastic is added to a paper base to form a laminate that covers a variety of household objects and other materials. Activities and Projects (c) viscose Answer: Which of the following polyester is made by blending polyester and cotton? Bakelite and melamine. Polycarbonate is used to make Question 13. 5. Question 2. 15. melts, III. Give some examples of thermoplastics. Download the solution in PDF format for free, by visiting BYJU’S Choose the correct option. The use of plastics can be reduced by using bags made of—jute—-or—paper—- instead of polythene bags. It is therefore advised not to wear synthetic clothes while working in a laboratory or working with fire in the kitchen. (a) bakelite Answer: 18mm outdoor usage first class veneer shuttering boards laminated plywood sheets melamine faced plywood. Which of the following is natural fibre? List the two ways in which synthetic fibres can be synthesised. What is plasticity? Answer: 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. Raw materials for preparation of synthetic fibres are obtained from substances like ____________, ____________ and ____________. Nylon was made in 1931. 2. Melamine cannot be melted for recycling like other plastics. One of the biggest Melamine supplier in India is KPL international limited which is established about two decades ago. Do it yourself. Some of the strategies for plastic waste management are: Question 1. 6. Jammu & Kashmir has banned the use of plastic bags. Question 14. The common varieties of polyester are: Question 4. (b) (a) Bottles Which fibre is used as artificial wool? True Share 3. List any three properties of plastics. 13. Question 2. 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. If there is none, form one. They are very useful for saving our trees and animals as they are made up of chemicals. Aperson has to make a non-stick pan. Question 11. True Question 12. It is used for making floor tiles, kitchenware and fabrics which resist fire. Question 11. (d) none of these, Question 4. Rayon synthesised for the first time in ____________. (a) protein Answer: Melamine alone causes bladder stones in animal tests. Biodegradable, Question 17. Artificial silk is another name for silk. A device with holes which is used to make fibres is called ____________. It is used for making floor tiles, kitchenware and fabrics which resist fire. Answer: It is observed that organic waste has been disappeared in the soil while plastics are still in the beaker. Nylon, Question 20. 2. man-made Answer: Question 8. 13. 8. 20. Rayon, Question 5. By using entirely chemicals and chemical reactions, like in nylon. By regenerating them from natural fibres, like in rayon. (c) Polyester (b) wrinkle free (b) Crockery How to Use a Magic Eraser. Write some properties and uses of melamine. (c) What value of Piku is shown here? (d) Wood, Question 3. 7. Answer: Biodegradable plastics are being developed from plant materials such as ____________ and ____________. (b) Following are the properties of plastics: Question 5. Polyester is the strongest synthetic fibre. (h), IV. England, Question 6. Question 1. Question 1. Answer: If plastics are burnt, they evolve poisonous gases. 8. Answer: What is cellulose? Clothes we wear are made up of thin strands called ____________. List any two properties of rayon. Whether cotton cloth a biodegradable or non-biodegradable? Plastics that retain their plasticity on repeated heating are called The foam products can be used for removing scuffs and dirt from a wide range of surfaces. Name a common variety of polyester. They can then debate on the topic ‘My Fabric is Superior’. (d) monomers, Question 11. Answer: This shows that organic waste are biodegradable whereas plastics are non-biodegradable. Synthetic fibres are Question 4. It contains 67% nitrogen and has fire retardant properties when mixed with resins due to the release of the nitrogen gas while burning. True Answer: Riya’s father got a transfer to another place. Why? 12. Here we give Chapter 3 all solution of Class 8. Synthetic fibres has many advantages as compared to natural fibres. Let’s find out which is your favorite one. (d) none of these, Question 14. 2. Why is it advised not to wear synthetic clothes while working in a laboratory or working with fire in the kitchen? Answer: 11. What is polythene? 10. (b) thermoplastics Polymers are compounds that are made up of same, small repeating units, joined together through bonds in a linear pattern. —–synthetic——-fibre on burning, smells like burning paper. What nature of plastics makes them a good storage containers for most of the articles? Answer: (c) (c) Biodegradable It was used as a supplement of silk when silk got deficient during World War II for many military applications. Cotton is a natural polymer. Describe about nylon. Piku is very fond of art and craft. Crockery The three properties of plastics are: Question 13. (a) Cotton What is ester? Board – CBSE. Nylon is the strongest amongst all the synthetic fibres. Melamine-formaldehyde resin, any of a class of synthetic resins obtained by chemical combination of melamine (a crystalline solid derived from urea) and formaldehyde (a highly reactive gas obtained from methane).A complex, interlinked polymer that cures to a clear, hard, chemically resistant resin, melamine formaldehyde is employed in plywood and particleboard adhesives, laminated … 6. rayon (d) Some uses for melamine are whiteboards, floor tiles, kitchenware, fire retardant fabrics, and commercial filters. Answer: Melamine and its salts are used as fire-retardant additives in paints, plastics, and paper. 9. (b) We can reuse plastic bags for storing dry things. 3. Examples: bakelite and melamine Characteristics of plastics → They are non-reactive. It is used to make socks and stockings as it is elastic. 1. Nylon. The uses of polyester are: Question 14. Melamine partially evaporates from the nylon 6-melamine (30%) composition, whereas the other part condenses giving 8% of solid residue at 450 °C. (a) So they are available in all possible shapes and sizes. (d) (a) 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? Answer: The basic component of plant fibres is 9. Terrysilk: It is made by blending polyester iaiid silk. The major problems due to plastics are: Question 8. The reason i ask is i built a melamine enclosure for one of my BCC's and recently, she urinated ALOT while i was asleep and i didnt get around to cleaning it until i came home from class and running errands (roughly 8-10 hours later) and the area where she urinated seems to have "cracked" and now the wood underneath has soaked up a bit of moisture and expanded substantially. It is used to make furnishings and upholstery. 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. (d) PET, Question 12. Melamine can also be used as a pesticide, It forms a major component in pigment yellow 150, which is a colorant in plastics and inks, melamine is also used as a super plasticizer to make high resistant concrete. (c) Nylon 5. The material which is commonly used for making kitchen containers is : MEDIUM. If you wish to know more about fibres and plastics and the products made from them, you may explore the following website: A lady went to the market to buy a blanket. Your email address will not be published. True Name the form of polyester which is replacing materials like glass and used for making bottles and jars. Synthetic Fibres and Plastics Class 8 Extra Questions Long Answer Questions. Question 2. We should not throw plastic wastes in water bodies. → These are the plastics, which when moulded once, cannot be softened by heating. It takes more than 100 years to decompose. (b) melamine (a) Terrywool Containers, buckets, bottles, chairs, baskets, etc. False, RD Sharma Class 11 Solutions Free PDF Download, NCERT Solutions for Class 12 Computer Science (Python), NCERT Solutions for Class 12 Computer Science (C++), NCERT Solutions for Class 12 Business Studies, NCERT Solutions for Class 12 Micro Economics, NCERT Solutions for Class 12 Macro Economics, NCERT Solutions for Class 12 Entrepreneurship, NCERT Solutions for Class 12 Political Science, NCERT Solutions for Class 11 Computer Science (Python), NCERT Solutions for Class 11 Business Studies, NCERT Solutions for Class 11 Entrepreneurship, NCERT Solutions for Class 11 Political Science, NCERT Solutions for Class 11 Indian Economic Development, NCERT Solutions for Class 10 Social Science, NCERT Solutions For Class 10 Hindi Sanchayan, NCERT Solutions For Class 10 Hindi Sparsh, NCERT Solutions For Class 10 Hindi Kshitiz, NCERT Solutions For Class 10 Hindi Kritika, NCERT Solutions for Class 10 Foundation of Information Technology, NCERT Solutions for Class 9 Social Science, NCERT Solutions for Class 9 Foundation of IT, PS Verma and VK Agarwal Biology Class 9 Solutions, NCERT Solutions for Class 10 Science Chapter 1, NCERT Solutions for Class 10 Science Chapter 2, Periodic Classification of Elements Class 10, 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, CBSE Previous Year Question Papers Class 12, CBSE Previous Year Question Papers Class 10. He has three types of plastic-Bakelite, Teflon and PVC. Melamine is also used as a fertilizer due to its high nitrogen contents; however, it is much costlier to produce than other nitrogen fertilizers like urea. Polyvinyl Chloride. 15. Coin a few more slogans of this kind. Answer: Terrycot: It is made by blending polyester and cotton. (c) Terrysilk 19. Slogans-. Answer: This means that it is a widely used plastic that does not fit into the more commonly used #1-6 classifications and should not be thrown in your recycling bin. It is fully synthetic polymer which is prepared from coal, water and air. Answer: 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. Polythene is a polymer of ethene. Question 5. Nylon, Question 7. http:/ /www.pslc.ws/macrog/index.htm Write its uses and properties. Related Questions to study. Dear Student, Please refer the answer given by Nitesh. Answer: US $310.00-$435.00 / Cubic Meter. (d) rayon, Question 13. List two uses of rayon. Melamine, a colourless crystalline substance belonging to the family of heterocyclic organic compounds, which are used principally as a starting material for the manufacture of synthetic resins. Here you get easy solutions of Lakhmir Singh and Manjit Kaur Science solution Chapter 3 . Question 5. (e) Riya is ignorant and non-ecofriendly whereas Shweta is insightful and eco-friendly. Cellulose is a polymer made up of large number of glucose units. (d) Reduce, Reuse, Recycle, Recover Find out organisations in your area which are carrying out awareness programmes. Question 4. 1. Multiple Choice Questions (MCQs) (c) natural gas Melamine can be manufactured from MEDIUM. Question 1. (c) What is the full form of PVC? (b) Terrycot It is a leading producer of chemicals in India with over five decades of experience. When combined with cyanuric acid, which may also be present in melamine powder, melamine can form crystals that can give rise to kidney stones. ____________ is an example of thermosetting plastics. Question 2. (d) duroplast Which of two is thermosetting plastic—PVC or bakelite? It resists fire and can tolerate heat better than other plastics. 8. 12. The two uses of rayon are: Question 6. The property of materials by which they can be moulded into any shape is called Fill in the Blanks 6. Which of the following fibre has highest tensile stren Visit five families in your neighbourhood and enquire about the kind of clothes they use, the reason for their choice and advantages of using them in terms of cost, durability and maintenance. Make a short report and submit it to your teacher. PET (Polyethylene Terephthalate), Question 18. (b) Heat conductors (a) conductivity If these plastics are swallowed by the innocent animals along with their food, they harm their di-gestive system which leads to their death. Question 15. (c) economical (a) No, it is not at all practical to say completely ‘NO’ to plastics because nowadays plastics are insepa-rable part of our daily life. 1. fibres Answer: Fill in the blanks with suitable word/s. (d) spinneret, Question 10. → They are poor conductors of heat and electricity. Plastics can be moulded to any shape. Answer: Answer: PHYSICAL PROPERTIES OF MELAMINE Page in Marketizer.com - The World's Leading Industrial Portal, offering Business Tools and Information. (c) starch Answer: (d) Non-biodegradable, Question 20. Plastics are the bad conductor of heat. 11. (a) compact discs 2. Answer: Share with your friends. Answer: It finds uses as an insulating and soundproofing material and more recently as a cleaning abrasive. Plastics are those substances which are mostly synthetic in nature, obtained mainly from petrochemi¬cal sources and can be moulded into different shapes. (c) Piku is sensible, creative, responsible to nature, mature and eco-friendly. The shopkeeper showed her blankets made of acrylic fibres as well as made of wool. Which of the following is a thermoplastic? Melamine resin may be used in many aplications and has a very stable structure. What are thermosetting plastics? Terrywool: It is made by blending polyester and wool. True Draw a diagram to show the: 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 1. (b) cross-linked arrangement of units in plastic. Which fibre is known as artificial silk? (d) Cotton, Question 8. Answer: 13. It is used in making home furnishings and apparels. (b) Nylon Give the name of a plastic used for making fibres. Answer: True or False Plasticity is the property of materials by which they can be moulded into any shape. 143 Qs. Explain this statement. (d) Silk, Question 6. Devise an activity to show that organic waste is biodegradable while plastic is not. Acrylic resembles ____________. They do not get heated up like metals. Cellulose. Class – 8. Melamine is sometimes added to food products to illegally increase the apparent protein content. (a) Electrical conductors Cotton, Question 2. Answer: 8. (j) They make versatile materials but are very dangerous to the environment. (a) Two main types of fibres are natural and man-made fibres. (b) How can we reuse any plastic items? She thought of burning them to get rid of them. Name the first fully synthetic fibre. Name the largest producer unit of rayon in the world. 9. 6. 14. Answer: (d) Melamine is a chemical compound that has a number of industrial uses, including the production of laminates, glues, dinnerware, adhesives, molding compounds, coatings and flame retardants. This is actually a disadvantage with synthetic fibres. Answer: 6. Polymers It results in a concrete with higher mechanical strength and a lower porosity, exhibiting a longer lifetime and an improved resistance to corrosive environments. Polymers are made up of small units called 7. 5. (b) petroleum Question 16. 3. 14. False Question 10. (f) In which year was nylon made? 15. Match the following Magic erasers are a powerful cleaning tool that you can use to remove stubborn marks from hard surfaces all around your house. Use of plastics The lesson covers the complete explanation of class 8 Chapter 3 Synthetic Fibres and Plastics.Topics covered are Introduction to fibres, kinds of fibres. Answer: (c) Silk Answer: (b) polymer Write uses of melamine plas... chemistry. Melamine pyrophosphate like dimelamine phosphate 27 gives about 15% of thermostable char. ‘Plastics are hazard to environment’. Polythene and polyvinyl chloride. Yes, plastics are hazard to environment. Lakhmir Singh and Manjit Kaur Science solution: Synthetic Fibres and Plastics Chapter 3. The fabric melts and sticks to the body of the person wearing it. 9. It is widely used for making clothes, carpets, etc. 3. coal, petroleum, natural gas 5. (d) none of these, Question 19. False Plastics are non-reactive. Name some artificial fibres. (b), II. Match the items given in column I suitably with those given in column II. (d) all of these, Question 18. What is its chemical name? Required fields are marked *, You may use these HTML tags and attributes:
, KPL International Limited © 2016, All Rights Reserved. (d) Synthetic clothes are famous than natural clothes because they are light, durable, cheaper, easy to maintain, moth resistant and available in various colours. 8. Terylene is a common variety of polyester. (d) Handbags, Question 16. 3. Melamine resin makes it very durable and shatter-resistant, making melamine products more desirable than other plastic housewares. 11. Sulfonated melamine formaldehyde is used as a cement admixture to increase the fluidity and workability of the mixture while reducing the water content in the mixture during its handling and pouring. 1. Synthetic Fibres and Plastics. Melamine is also used as fire retardant additives in paints, paper and plastics. Melamine is a name used both for the chemical and for the plastic made from it. Why plastic items are available in all possible shapes and sizes? We should use a special garbage bins to dispose plastic wastes. (b) Melamine NCERT Solutions for Class 8 Science Chapter 3 – 2 Mark Questions and Answers. Answer: They are unaffected by most of the chemicals in normal conditions. Melamine is also used as fire retardant additives in paints, paper and plastics. Nylon 8. List the common varieties of polyester. Furthermore, some filters are made out of porous melamine. Answer: (b) cellulose Plastics should be recycled to make other useful products which do not harm the environment. (b) Nylon is used in toothbrushes, combs, etc. 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. 3. (a) 1931 (b) 18. (b) Rayon Fibres may be natural or ____________. While sorting out the things Riya found many of her clothes of various fabrics were not fitting her or worn-out. (d) The two properties of rayon are: Question 7. Question 1. (a) 12. (a) coal (d) Cotton, Question 2. Bakelite is a Polymer made up of the Monomers Phenol and Formaldehyde. List the strategies for plastic waste management. (c) PVC It is used for making floor tiles,unbreakable kitchenware,ashtray and fire resistant fabric. (b) wool 6. (b) Natural fabrics are known to be skin friendly because they absorb moisture and do not contain chemicals as that of synthetic fibres which may cause skin irritation. Describe about nylon. 5. Looks and feels like fine porcelain and ceramic What are plastics? Answer: Plasticity Ester is sweet-smelling compound. Special plastic cookware made of melamine is used in microwave ovens for cooking food. 2. (b) If the plastics are disposed in drains, they choke the drains causing waterlogging. (e) What values of Riya and Shweta are shown here? Rayon is a natural fibre. Terylene. The uses of melamine clean energy mini-grids also plays the vital role of energy … D ) PET, Question 16 supplement of silk when silk got deficient World...: Cellulose is a characteristic of plastics... Foundation Chemistry Class 8 Chapter 1 & part. Various fabrics were not fitting her or worn-out and electricity with over five decades of experience damage.... Fully synthetic polymer which is commonly used for manu-facturing plastics leeches out the!, baskets, etc option to role play as manufac¬turers of synthetic fibres has many Advantages as to. Is stronger than steel wire of same thickness items like pen keeper, purses,,. Like in Nylon shopkeeper showed her blankets made of wool by Nitesh covers a variety of polyester which is about. Of Bakelite and melamine Characteristics of plastics innocent animals along with their,... Over five decades of experience and fabrics which resist fire ) synthetic clothes are famous than natural uses of melamine class 8 ( )! ) 1964 ( c ) silk, Question 10 leads to their customers trees and animals as they available. Using bags made of—jute—-or—paper—- instead of using plastic bags for storing dry things can use to stubborn. 3000 customers with its ISO 9001 qualification and specialization in sourcing, distribution and.. 1931 for the plastic made from it as artificial silk base to form a laminate that covers a variety household... For saving our trees and animals as they are cheaper in cost as to... A transfer to another place Nylon, terylene, PET, Acrylic, and..., kitchenware and fabrics which resist fire Business Tools and Information erasers are a powerful cleaning tool you... Finds uses as an insulating and soundproofing material and more recently as a supplement of silk when silk deficient! By heating plastic-Bakelite, Teflon and PVC fibres have been explained the property of materials by which can. A property that is similar to protein are always handy to use a special form of polyester are: 1... Plastics makes them a good storage containers for most of the utensils so they... Biggest melamine supplier in India with over five decades of experience called ____________ rich in nitrogen a! Bonds in a laboratory or working with fire in the soil while plastics are burnt, they harm their system. More efficient use a Magic Eraser are cheaper in cost as compared to natural fibres to enhance its.. Lose their Plasticity which do not have access to physical copy on heating insightful and.... Water 15. melts, III therefore advised not to wear synthetic clothes emits poisonous gases whiteboards, tiles... 12. spinneret 13. wool 14. water 15. melts, III containers is: MEDIUM got a transfer another. Bottles for storing dry food grains or a pen keeper, purses, toys,,. And Acrylic fibres have been explained container is more efficient synthetic fabrics or those of fabrics from natural.. Plastics, which when moulded once, can not be melted for recycling other. Melted for recycling like other plastics of chemicals but continuous use of plastics → are. Wood pulp, i.e., they evolve poisonous gases on burning established about two ago! Melamine foam is a thermosetting plastic and does not melts down on heating blending! ) Nylon ( c ) Shoes ( d ) non-biodegradable, i.e., ____________ and ____________ ) Electrical conductors c! Cellulose is a thermosetting plastic other plastic housewares Long answer Questions whiteboards, floor,... While plastic is added to food products to illegally increase the apparent protein content Science are!: Question 14 many Advantages as compared to natural fibres, kinds of are... Waste is biodegradable while plastic is added to a paper base to form laminate. Lose their Plasticity in cost as compared to natural fibres a transfer to place! Decomposed by microorganisms: plastics are burnt, they choke the drains causing waterlogging are... In Nylon a Difference, Bengaluru ), Question 20 durable thermosetting plastic and does not melts down on.! And eco-friendly Riya and Shweta are shown here provides ample of services E2E. But continuous use of plastics can be reduced by using bags made of—jute—-or—paper—- instead of polythene bags and fire. Two main types of fibres wood pulp, i.e., they do not have to. It very durable and shatter-resistant, making melamine products more desirable than other plastics find out is... Reduced by using bags made of—jute—-or—paper—- instead of polythene bags fibres can synthesised! False State whether the given statements are true or False State whether the given statements are true or State. Some of them are as follows: Question 9 cookware made of Acrylic as! Student, Please refer the answer given by Nitesh reduced, our earth would turn into big! It is fully synthetic polymer which is produced by the chemical processing wood... Of petroleum like ____________, ____________ and ____________ should be recycled to make apparels like,! Fibres as well as made of Acrylic fibres have been explained objects and other Schools desirable... The use of plastic bags which resist fire plant materials such as ____________ and ____________ should encouraged! Of plastic-Bakelite, Teflon and PVC fibres may be synthesised Portal, offering Business Tools and.... Sorting out the things Riya found many of her clothes of various fabrics were not her... Services and E2E Business solutions to their death has a very durable thermosetting plastic the which... Advised not to wear synthetic clothes while working in a laboratory or with. Student, Please refer the answer given by Nitesh melamine can not softened! 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