Looks and feels like fine porcelain and ceramic (b) Terrycot 14. Do it yourself. 5. 10. 11. 3. (b) wrinkle free List two uses of rayon. (b) We can reuse plastic bags for storing dry things. Learn about the Structure, Properties, and Uses of Bakelite and How it is Made. Polythene is a polymer of ethene. (d) none of these, Question 19. ____________ is an example of thermosetting plastics. 2. Name some objects made of plastics. (c) bottles Riya’s father got a transfer to another place. They are manufactured by the consumption of a large amount of petroleum. Question 1. Organisations which are carrying out awareness programmes are – Conserve India, TMAD (To Make A Difference, Bengaluru), etc. The property of materials by which they can be moulded into any shape is called 5. (c) Polyester 5. 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) Its help you to complete your homework. Answer: If plastics are burnt, they evolve poisonous gases. Do it yourself. 2. It takes more than 100 years to decompose. 143 Qs. Slogans-. Children may be given an option to role play as manufac¬turers of synthetic fabrics or those of fabrics from natural sources. (b) cross-linked arrangement of units in plastic. Write uses of melamine plastic. PHYSICAL PROPERTIES OF MELAMINE Page in Marketizer.com - The World's Leading Industrial Portal, offering Business Tools and Information. (b) Silk (a) Is it practical to say completely ‘NO’ to plastics? Acrylic resembles ____________. —–synthetic——-fibre on burning, smells like burning paper. Answer: 7. 12. Name a synthetic fibre which is polyamide. This is actually a disadvantage with synthetic fibres. 14. water (a) thermosetting plastics (d) All of these, Question 15. Name a common variety of polyester. 3. coal, petroleum, natural gas Question 10. 9. It was used as a supplement of silk when silk got deficient during World War II for many military applications. 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 Plastics are those substances which are mostly synthetic in nature, obtained mainly from petrochemi¬cal sources and can be moulded into different shapes. Answer. The shopkeeper showed her blankets made of acrylic fibres as well as made of wool. (e) (b) Nylon Thereafter, this contamination was found in many other products that use protein content as … (a) Nylon True Answer: Question 8. Answer: (d) PET, Question 12. Piku is very fond of art and craft. 3. 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. However, similar behaviour with a more thermostable residue is shown by melamine cyanurate. (b) Melamine Melamine cannot be melted for recycling like other plastics. 12. Synthetic Fibres and Plastics Class 8 Science Chapter 3 as per NCERT Book used in CBSE and other Schools. Which of the following fibre has highest tensile stren 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. 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. Terrycot: It is made by blending polyester and cotton. Take some organic waste (like peels of fruits, vegetables) in a beaker and some plastic waste materials in other beaker. (h), IV. Question 5. (d) duroplast Rayon synthesised for the first time in England. Answer: (e) What values of Riya and Shweta are shown here? Lakhmir Singh and Manjit Kaur Science solution: Synthetic Fibres and Plastics Chapter 3. Fill in the Blanks Answer: Melamine alone causes bladder stones in animal tests. Plastics that retain their plasticity on repeated heating are called Answer: Write uses of melamine plas... chemistry. (c) PVC View More Information about: Melamine More Information about Buying, Selling and doing Business with Melamine Suppliers / Providers of Melamine … The synthetic fibres melt on heating. Answer: 6. Bakelite is a Polymer made up of the Monomers Phenol and Formaldehyde. Clothes we wear are made up of thin strands called ____________. They make versatile materials but are very dangerous to the environment. Question 3. Polyvinyl Chloride. Why is it advised not to wear synthetic clothes while working in a laboratory or working with fire in the kitchen? Which fibre is used as artificial wool? 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. Synthetic fibres are Answer: 6. (c) Rayon Question 5. It contains 67% nitrogen and has fire retardant properties when mixed with resins due to the release of the nitrogen gas while burning. (c) starch (b) Rayon (c) Polyester Plastics are non-biodegradable in nature. The resin is a versatile material that has a highly stable structure. 4. Biodegradable, Question 17. Rayon synthesised for the first time in ____________. 7. 18mm outdoor usage first class veneer shuttering boards laminated plywood sheets melamine faced plywood. (d) Handbags, Question 16. 10. Synthetic Fibres and Plastics Class 8 Extra Questions Long Answer Questions. (d) Non-biodegradable, Question 20. Nylon was made in 1931. 2. 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? (d) (a) Nylon Melamine is sometimes added to food products to illegally increase the apparent protein content. (a) Rayon Name a natural fibre. 14. How to Use a Magic Eraser. 4. Bakelite and melamine. Name the largest producer unit of rayon in the world. 5. Rayon is the first man-made cellulose fibre. 10. cellulose, starch Plastic that can resist fire is 15. (d) Synthetic clothes are famous than natural clothes because they are light, durable, cheaper, easy to maintain, moth resistant and available in various colours. Answer: Reduce, Reuse, Recycle, Recover Question 10. Melamine is a versatile material. 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. We should use a special garbage bins to dispose plastic wastes. Synthetic fibres are moth and insect resistant. Rayon is a man-made fibre which is produced by the chemical processing of wood pulp, i.e., a natural substance. If these plastics are swallowed by the innocent animals along with their food, they harm their di-gestive system which leads to their death. (d) Why synthetic clothes are famous than natural fabrics? (a) What are the two main types of fibres? (b) Cotton 3. Question 16. Answer: 12. Its uses include whiteboards, floor tiles, kitchenware, fire retardant fabrics and commercial filters. False Give the name of a plastic used for making fibres. Plasticity is the property of materials by which they can be moulded into any shape. Choose the correct option. (b) Heat conductors Describe about nylon. Practicing 4R’s principle, i.e., Reuse, Recycle, Reduce and Recover should be encouraged. (c) 1948 (b) thermoplastics Answer: (a) They are very useful for saving our trees and animals as they are made up of chemicals. Answer: Match the items given in column I suitably with those given in column II. (b) molecules Cotton is a natural polymer. Question 4. The material which is commonly used for making kitchen containers is : MEDIUM. Class – 8. Synthetic fibres ____________ on heating. It finds uses as an insulating and soundproofing material and more recently as a cleaning abrasive. Melamine is rich in nitrogen, a property that is similar to protein. (b) Crockery Some uses for melamine are whiteboards, floor tiles, kitchenware, fire retardant fabrics, and commercial filters. Terrywool is made by blending polyester and silk. We should not throw plastic wastes in water bodies. Question 15. Plastics are the bad conductor of heat. 1. True Answer: (c) What are the uses of polyester? (b) How can we reuse any plastic items? Mark them as A and B respectively. It is used for making floor tiles,unbreakable kitchenware,ashtray and fire resistant fabric. Question 1. It is a leading producer of chemicals in India with over five decades of experience. (b) Which fabrics are known to be skin friendly? Answer: Containers, buckets, bottles, chairs, baskets, etc. It is used to make socks and stockings as it is elastic. (a) durable 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. Organise a debate in the school. The government should ban the use of plastic bags. Answer: Melamine partially evaporates from the nylon 6-melamine (30%) composition, whereas the other part condenses giving 8% of solid residue at 450 °C. Answer: 9. 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. 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. The two properties of rayon are: Question 7. Practicing 4R’s, i.e.,____________ ,____________, ____________ and ____________ should be encouraged. It resists fire and can tolerate heat better than other plastics. The property of materials by which they can be moulded into any shape is called Which of the following is natural fibre? 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. It is used to make furnishings and upholstery. (d) Wood, Question 3. Cover the wastes in both the beakers with soil. Answer: Answer: False Answer: → These are the plastics, which when moulded once, cannot be softened by heating. Here you get easy solutions of Lakhmir Singh and Manjit Kaur Science solution Chapter 3 . Melamine is sometimes added to food products to illegally increase the apparent protein content. → They are poor conductors of heat and electricity. Aperson has to make a non-stick pan. Melamine and its salts are used as fire-retardant additives in paints, plastics, and paper. Answer: (a) conductivity (b) 1964 (a) plastic Which of the following are made from thermosetting plastic? (a) linear arrangement of units in plastic. Some of the strategies for plastic waste management are: Question 1. (d) 1. False True Is using plastics for storing food safe? Biodegradable plastics are being developed from plant materials such as ____________ and ____________. Melamine pyrophosphate like dimelamine phosphate 27 gives about 15% of thermostable char. Answer: Polyester is the strongest synthetic fibre. Melamine foam is a special form of melamine resin. Afterwards, this plastic is added to a paper base to form a laminate that covers a variety of household objects and other materials. 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