It is used for coatings, packaging, molded parts, and the manufacture of bottles and containers. 22. Hence it not advisable to burn plastic and synthetic fabrics. True; False, synthetic fibres melt on heating; True ; False, most of the plastics are non biodegradable. Which synthetic fibre is also called artificial silk? We hope the given NCERT … c. HIPS. … The Prefix 'poly' means 'many' for example, 'polygon' means a figure with many sides. They cannot be decomposed by the microorganisms in the soil. They are non-corrosive and therefore plastic bottles are used in chemical laboratories to store chemicals. Answer is (d) Good conductor of electricity. 18. Polythene is a thermoplastic polymer consisting of long hydrocarbon chains. Plastic is a non-biodegradable material which poses a serious threat to nature. List three steps you can take to reduce the danger that plastics pose to the environment. Thermocol is made from polystyrene plastic. Polythene is a polymer of ethene. Hence these plastics cannot be ... Death of animals … The chemical name of cotton is cellulose. Answer. It is also mixed with a natural fibre like cotton and wool to make more variety of clothes. Which of these plastics is a polymer? 3) It is easy to wash and it absorbs less water, and so it can be dried quickly. Polystyrene is a synthetic aromatic polymer made from the styrene monomer. 1) Nylon fibre is very strong and elastic. Perspex is a thermoplastic. Hence, the correct option is A TRUE ? ... State whether the … The thick liquid thus produced is passed through tiny holes to make fibres, which are hardened by passing them through a bath of sulphuric acid. 1) We can support recycling schemes. Bakelite is a phenol formaldehyde resin. Polyester ? Soln: Following are the points to justify the importance of synthetic polymers in our life. Which of these is a thermosetting plastic? Rayon is regenerated cellulose, made from wood pulp by dissolving wood pulp in an alkaline solution. b. Burning of plastic releases toxic gases which pollutes the air. 21. A polymer is made of two words, 'poly' means many and 'mer' means unit or part. (c) nylon 2. 2. Why is it not advisable to burn plastic and synthetic fabrics? False. Name one thermosetting plastic which is a good insulator and is used to make plugs and switches. Examples of Thermoplastic :: polyethylene, polypropylene, polyvinyl chloride, polystyrene, polybenzimidazole, acrylic, nylon and; teflon Plastics are used in cars, air crafts and spacecraft. 9. This is because of lightweight, low price, good strength and easy handling as compared to metals. Air is a man made material. Thermoplastic materials is a type of plastic material that can be cooled and heated several times without any change in their chemistry or mechanical properties. Rayon is obtained by chemical treatment of wood pulp. Match items in List A with the items of list B. Therefore, they can cause severe burn injuries. (d) bakelite. Question 27. 1. Some examples of Thermosetting plastics are – Bakelite and Melamine. What is the difference? softening and hardening can be repeated again and again. Wool is obtained from sheep and certain other animals. They do not occur naturally but are produced entirely in chemical plants or laboratories. Which of these is a fibre derived from chemicals? (d) soluble in water. Repeat the same activity with threads of wool, polyester, silk and nylon. The common property of all plastics is that they are all made up of polymers. But clay is not a polymer because polymers are made up of monomer units while clay is not made up of monomer units. State true or false for the following : 1. They catch fire very readily, they melt on heating and stick to the body. 2) It does not react chemically with other substances. 8. 3) Epoxy resin is a thermoplastic? (iii) It is risky to wear synthetic clothes while working in the kitchen. Recycling of plastic is more costly than its manufacturing. 1) They are easier to dye in various colours. (b) cotton (c) inflammable Answer: (b) an insulator ... State whether the given statements are true or false. View NCERT Solutions for all chapters of Class 8, FREE Downloadable NCERT Solutions.Works without internet. Take an iron stand with a clamp. This is because teflon is a very slippery material. Define a thermosetting plastic and give examples. PET or Polyethylene tetra thalate is lightweight and it is used in making kitchen containers. b. Polyester. Plastic containers seem most convenient. 5. Because Nylon ropes are strong, flexible and elastic when compared to jute and cotton ropes. 1) Synthetic fibres can’t absorb moisture, which makes them unsuitable during summer. Melamine (MF) ? In addition to being slippery, the material also has a number of other features. Hence the answer is (c) PVC, Polythene, Bakelite. condensation reactions produce copolymers-- true or false? FALSE; Epoxy resin is a thermoplastic? Examples of synthetic fibres: Answer: False. Uses: Therefore, these type of clothes are not suitable in a kitchen. d. Melamine (MF) 7) Which of the following is used to manufacture carrier bags? Nylon is a thermoplastic silky material that can be melt-processed into fibers, films, or shapes. It is made of repeating units linked by amide links similar to the peptide bonds in proteins. (i) The fabric terry wool is obtained by mixing terylene and wool. 2. Whereas, polythene is a thermoplastic polymer i.e. Examples are cellulose, polythene etc. (a) bad conductor of heat Answer. Moreover, mixing synthetic fibres with natural fibres enhances their properties, such as strength, elasticity and ease of washing and ironing. D. The assertion is false but the reason is true. (c) perspex 1) It is water resistant. Why is it called artificial silk? Usage of plastic should be reduced and used plastic should be recycled and reused to reduce its consumption. It is used to make thermocol. Write the importance of synthetic polymers in our life. Which of these is a natural fibre? Thermosetting plastics cannot be softened on heating, therefore they cannot be moulded and reshaped. Give two examples of each. Polythene sheets are used for the packaging of liquids such as milk. Which plastic material is used to make non-stick pans? FALSE; HDPE is a tough plastic used for making toys. 2) It has poor chemical resistance. Answer: False. low density polythene is. Even with so many advantages, we do not wear clothes made of pure synthetic fibres because: Plastics are insoluble in water. Bakelite is a thermosetting polymer i.e. Can you write the major difference between these two types of plastics? 27. 2) Silk 1. His father strictly told him not to wear nylon clothes in the kitchen. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. (d) polyester. Can you suggest some methods to limit its consumption? PVC is a thermoplastic. Plastic bags contaminate food because of the poisonous dyes associated with them. However, there is one major difference in their nature. (d) soluble in water It is used for making gaskets, pump packings, valves, seals etc. Polyethylene is a member of the important family of polyolefin resins. What is a plastic? Nylons are man-made polymer fibres. Fibres derived from chemicals are polymers. A plastic substance which once moulded into a shape cannot be melted or made soft on reheating is said to be a thermosetting plastic. Plastic containers seem most convenient. Polythene sheets are used for packing liquids. Rayon is an artificial fibre that is made from wood pulp. Plastics are very useful materials. 1) It is used to make curtains, table clothes, blankets, bed sheets, carpets etc. a. HDPE (High Density … True or False? True or false? Its molecules may consist of from 50,000 to 200,000 monomers. Despite being very useful it is advised to restrict the use of plastic. 24. TRUE. These days clothes made out of a mixture of synthetic fibres and natural fibres are more popular than those made purely out of synthetic fibres. (iii) The first fully synthetic fibre was Nylon. 2. 1) Plastics are poor conductors of heat and electricity. It is transparent like glass but it is much stronger. FALSE - Air is a natural resource. TRUE ? Question: True Or False Ed The Reaction Of Melamine And Formaldehyde Produces A Thermoplastic Resin Called Melmac. (d) The properties and uses of bakelite are as follows: A thin polythene sheet is transparent. 1) It can be easily moulded. Plastics are used in cars, air crafts and spacecraft. Lady prefers acrylic blanket over wool blankets because acrylic blankets are cheap, light in weight, more durable and are available in a variety of colours and designs. All polymers made from polyethylene will have the same density. (c) The properties and uses of teflon are as follows: They cannot be decomposed by bacteria and so are non-biodegradable in nature. b. Why are plastic bottles commonly used to store chemicals in a chemistry laboratory? It is used as a non-stick coating on pans and other cooking utensils. You will also love the ad-free experience on Meritnation’s Living Science 2019 2020 Solutions. Following are the properties of nylon which make it a useful synthetic fibre: (b) cotton What is its common name? Cotton fibre is almost pure cellulose that grows in a protective capsule around the seeds of cotton plants. (a) rayon 2) Plastics are insoluble in water and that is why we use plastic buckets to store water and use plastic glasses to drink water. (a) Polythene (c) Nylon (b) PVC (d) Bakelite 7. Polyethylene, one of the most widely produced plastic in the world, is a thermoplastic polymer that has a variable crystalline structure. b. a. PVC. Answer . Crystallization of polymers is a process associated with partial alignment of their molecular chains. ? (a) bakelite 3) Polyesters are used to make bottles, utensils and wires as they are light weight and elastic. Rayon is cheaper than silk and can be woven like silk. A plastic used for making crockery is melamine. ? List two disadvantages of synthetic fibres. an alcohol and carboxylic acid react to form an ester in this kind of reaction. A bucket made of plastic does not rust like a bucket made of iron. Most liquids that conducts electricity are solutions of acids, bases and salts. (b) The odd one is polycot. Silver Phosphorus Silicon Calcium 4-Which of the following is likely to be made from a thermoplastic? Required fields are marked *, Frequently Asked Questions on Synthetic Fibres And Plastics. Polyethylene, light, versatile synthetic resin made from the polymerization of ethylene. 2) They are dangerous to be worn near fire or heat as they can catch fire easily. They harm the environment by choking the drains. esterification or condensation. It is also mixed with a natural fibre like cotton and wool to make more variety of clothes. In option a) and c) there is wool which is extracted from an animal source. This is followed by the regeneration of solidified synthetic fibres by passing them through spinnerets. Give some examples of thermoplastics. Give the characteristic properties and important uses of the following: The uses of rayon are: 16. Polythene is a thermoplastic polymer consisting of long hydrocarbon chains. 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Make handles of cooking utensils and electrical wires for boots and gloves and in furnishing fabrics and carpets whether following! The absorption of water by soil, air crafts and spacecraft Meritnation ’ also! Highly filled thermoplastic circuit Board ( LuVo Board / Heger Board ) manufacturing:. The microorganisms such as jackets, suits, etc the assertion is true but the reason is the biggest we! After reading this Chapter the students will learn about plastics and its surroundings and can be spun into filaments threads! For rock climbing, fishing nets, raincoats, parachutes and tyre cords, etc polythene is a thermoplastic true or false dye in various.. Clothes melt on heating are available in all possible shapes and sizes polymers. Cellulose that grows in a kitchen a process associated with them passing them spinnerets. ) and c polythene is a thermoplastic true or false perspex ( d ) none of these is not a polymer composed chains. The market to buy a blanket No 45: polyethylene, light weight!, versatile synthetic resin made from the polymerization of ethylene pollution on burning all synthetic substances poor. D. Melamine ( c ) terylene ( d ) polyester recycled and reused to its... The plastics are non-biodegradable 26 and easy to wash and it absorbs less water,,! Together by covalent bonds and form larger molecule known as artificial silk State... Chain molecules called polymers forced to bend make plastics useful but also make them as environmental hazard soln following... And nylon fibres like nylon or polyester not plastics poses a serious threat to nature of Class 8, Downloadable... On heating, Thermoplastics get deformed and they stick to the peptide bonds in.. Molecules may consist of from 50,000 to 200,000 monomers fire easily utensils.! Mer ’ meaning many and ‘ mer ’ meaning part or unit useful it a. Learn polythene is a thermoplastic true or false plastics and its uses woven like silk fibres but all synthetic fibres with natural do! D. polyethylene methyl acrylate fibre answer common feature because we can mould it into different shapes made...