The common property of all plastics is that they are all made up of polymers. Polyethylene, one of the most widely produced plastic in the world, is a thermoplastic polymer that has a variable crystalline structure. 2. Why has government banned the use of polythene bags ? (i) The fabric terry wool is obtained by mixing terylene and wool. In the second part, the students will learn about plastics and its uses. (d) teflon. (d) polyester. Plastic is a non-biodegradable material which poses a serious threat to nature. Bake lite is poor conductor of electricity. Which of the following is not a common property of plastics? Whereas nylon or polyester, fibers are purely synthetic polymers, made entirely from chemicals. 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. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. It is made of repeating units linked by amide links similar to the peptide bonds in proteins. Write the importance of synthetic polymers in our life. Lata always prefers to buy things from the market that use fewer plastics in packaging why does Lata do this? an alcohol and carboxylic acid react to form an ester in this kind of reaction. Thermosetting plastics when moulded once can not be softened by heating. They are non-corrosive and therefore plastic bottles are used in chemical laboratories to store chemicals. (v) A plastic used for making crockery is melamine. Thermosetting plastics cannot be bent as they break when forced to bend. Why is this necessary? 2) It has poor chemical resistance. Plastics are useful but today they have become a serious global environment and health concern due to their excessive use. 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. Polythene is a thermoplastic polymer consisting of long hydrocarbon chains. Nylon is a synthetic fibre which is very strong, even stronger than steel wire. Give one use of plastics linked to each of these properties. (b) cotton Polyester ? View NCERT Solutions for all chapters of Class 8, FREE Downloadable NCERT Solutions.Works without internet. 7. To understand the chapter in a better and easy way students are advised to solve NCERT exemplar Class 8 Science Chapter 3 synthetic fibres and plastics. State true or false for the following : 1. Question 5. 11. condensation reactions produce copolymers-- true or false? List the important properties of nylon that make it a useful synthetic fibre. (iii) The first fully synthetic fibre was Nylon. Clay is a 'plastic' material. Give the characteristic properties and important uses of the following: 4) Plastics easily melt on heating and therefore they can be moulded into different shapes. Disposing of plastic waste is the biggest problem we face to regret the use of plastics. 2) It is used to make apparels such as jackets, suits, etc. False. They are non-corrosive, therefore we can store chemicals in them safely. Polyethylene is crystalline, translucent, and thermoplastic—i.e., it softens when heated. Answer: (b) an insulator ... State whether the given statements are true or false. 1) Plastics are poor conductors of heat and electricity. Acrylic It is used for sweaters, tracksuits, linings for boots and gloves and In furnishing fabrics and carpets. (d) silk. Which property of plastics makes them so useful but also makes them an environmental hazard? Clay is a mixture of compounds. a. PVC. Answer. 9. Answer: False. It chokes drains and blocks the pores of soil, which hinders the absorption of water by soil. Thermoplasticis a plastic which gets deformed easily on heating and can be bent easily e.g., Polythene and PVC. Some examples of Thermosetting plastics are – Bakelite and Melamine. (d) polyvinyl chloride. Rayon is obtained by chemical treatment of wood pulp. These fumes also cause cancer. Thermocol is made from polystyrene plastic. 3) It is easy to wash and it absorbs less water, and so it can be dried quickly. Plastics It is used to store food item, water, milk, pickles, dry food, etc. Polystyrene is a synthetic aromatic polymer made from the styrene monomer. 2) Polyester. 1. Plastic containers seem most convenient. Write the importance of synthetic polymers in our life. The material similar to silk in appearance is. (b) polythene Answer. Thermoplastic polymers can be repeatedly heated and moulded into any desired shape. Question 27. Polythene sheets are used for the packaging of liquids such as milk. A polymer is a chain of many small units joined together which are called monomers. It is also used to insulate the hollow walls of the refrigerator. 2. Highly filled thermoplastic circuit board (LuVo Board / Heger Board) Manufacturing process: extrusion . The molecular structures of synthetic fibres and plastics have one common feature. a car … (d) thermosetting plastics – (iv) polyester, (d) thermosetting plastics – (ii) electric switches. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. iii) True because synthetic clotes melts on exposure to heat iv) False- Plastics are non-biodegradable 26. b. Plastic is a bad conductor of electricity. 4. Give some examples of thermoplastics. Pebbles float on water. Plastic is not bio-degradable and disposing of plastic waste is a major issue. It is a blended fabric, but rayon, nylon and acrylic are not. Thermosetting Plastics:There are some plastics which when moulded once cannot be softened by heating. They last much longer than any other material. Wool is obtained from sheep and certain other animals. A bucket made of plastic does not rust like a bucket made of iron. Its molecules may consist of from 50,000 to 200,000 monomers. Perspex is a thermoplastic. Differentiate between thermoplastics and thermosetting plastics. 22. (b) cotton 8. 2) Plastics are insoluble in water and that is why we use plastic buckets to store water and use plastic glasses to drink water. Your email address will not be published. They catch fire easily and stick to the body and cause severe burns and injuries.Therefore, they are not suitable in kitchen and laboratories. 6. (ii) The synthetic fibres are also known as ______ fibres. TRUE. PET or Polyethylene tetra thalate is lightweight and it is used in making kitchen containers. They cannot be decomposed by the microorganisms in the soil. 1. These are used for manufacturing toys, combs, cargrills and various types of containers. (a) rayon Acrylic blankets are cheap, light in weight, more durable and are available in a variety of colours and designs. Give two examples of each. Plastics are used in cars, air crafts and spacecraft. 21. The uses of rayon are: It is, therefore, known as artificial silk. 28. They are non-biodegradable in nature. True. Question: True Or False Ed The Reaction Of Melamine And Formaldehyde Produces A Thermoplastic Resin Called Melmac. Bakelite is a phenol formaldehyde resin. 2) Clothes made from rayon are very comfortable in summer because they can absorb sweat from the body. Silver Phosphorus Silicon Calcium 4-Which of the following is likely to be made from a thermoplastic? They do not absorb sweat or water and they stick to the body, which makes them uncomfortable to wear in hot humid conditions. Automotive Technology: A Systems … What is the difference? Acrylic It is used for sweaters, tracksuits, linings for boots and gloves and In furnishing fabrics and carpets. Bakelite is a bad conductor of heat and it does not get soft on heating hence Bakelite is used to prepare handles of cooking utensils. exothermic. A thin polythene sheet is transparent. (b) bakelite Bakelite is a thermosetting phenol formaldehyde resin. (c) polythene (b) bakelite Study Resources. They cannot be decomposed by bacteria and so are non-biodegradable in nature. Can you tell why? Does this imply that it is a polymer? Whereas Thermosetting plastics cannot be softened by heating. Nylon was also known as artificial silk in China. Question 4. On the other hand, clothes spun out of fibres made by a mixture of synthetic and natural fibres do not cause such problems. 24. Also, write false statements in their correct form. (a) rayon What is its common name? Answer. Examples are bakelite and melamine. They melt on heating and stick to the body of the person wearing them which causes severe burn injuries. 21. 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. That is why plastic buckets are used to store water and plastic glasses are used to drink water. 3) Polyesters are used to make bottles, utensils and wires as they are light weight and elastic. Answer: False. PVC is a thermoplastic. (c) perspex 2) We can buy products with less plastic packaging. Which of these plastics is a polymer? 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Plastic articles are available in all possible shapes and sizes. Nylon It is used for making ropes for rock climbing, fishing nets, raincoats, parachutes and tyre cords, etc. Hint: Write uses of synthetic polymers like nylon, acrylic, terylene, PET, plastics, etc. Uses: 2) It is useful in making garments, socks and stockings. SOLUTION Nylon is a generic designation for a family of synthetic polymers, based on aliphatic or semi-aromatic polyamides. once they are moulded and harden on cooling, they cannot be softened again. It is woven like silk fibres but is man-made, unlike silk. For example, polythene is made of many ethene monomer units. 1. Match items in List A with the items of list B. Therefore, these type of clothes are not suitable in a kitchen. ... when ice melts, covalent bonds within water molecules are breaking-- true or false. True. 2) It is strong but flexible and can be rolled into sheets and moulded into different shapes. These chains fold together and form ordered regions called lamellae, which compose larger spheroidal structures named spherulites. Terylene It is used in the textile industry to make clothes like sarees, tapestry and dress material. What is the most common source for synthetic fibres? 1) Being very strong and crease resistant, polyester is used to make pants, shirts, suits and bed sheets. Answer . i) True ii) False- Synthetic fibres melt on heating. (ii) The synthetic fibres are also known as man-made fibres. Which of the following is a source of rayon? Which artificial fibre is made from wood pulp? Can you write the major difference between these two types of plastics? Synthetic fibres catch fire easily. 1. Hence plastic does not form rust. What is the difference? D. The assertion is false but the reason is true. 3) Plastics are inert to air and water. They are inflammable. Answer: True. Which of the following represents the correct match for items in Column A with those in Column B. Hence, they are used to make things such as toys, buckets etc. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Required fields are marked *, Frequently Asked Questions on Synthetic Fibres And Plastics. Cotton fibre is almost pure cellulose that grows in a protective capsule around the seeds of cotton plants. Plastic is a non-reactive material. A lady went to the market to buy a blanket. Note down the total weight required to break the thread. We hope the given NCERT … esterification or condensation. Why? Soln: Following are the points to justify the importance of synthetic polymers in our life. NCERT Exemplar for Class 8 science Synthetic Fibres and Plastics will bestow you with a variety of questions like synthetic fibres and plastics Class 8 MCQs, short answer questions and long answer questions. ... 4. b 5. a. iii, b. iv, c. v, d. i, e. ii. 2. Why is it so? It is used to make electrical goods, combs, fountain pens, buttons, plugs and switches. (c) teflon Teflon is used to make non-stick pans. Recycling of plastic is more costly than its manufacturing. 19. Crystallization of polymers is a process associated with partial alignment of their molecular chains. (c) The properties and uses of teflon are as follows: They do not occur naturally but are produced entirely in chemical plants or laboratories. His father strictly told him not to wear nylon clothes in the kitchen. Rayon is a manufactured regenerated cellulose fibre that is made from purified cellulose, primarily from wood pulp. Repeat the same activity with threads of wool, polyester, silk and nylon. Natural fibres are obtained by plants and animals and synthetic fibres are obtained by chemical processing. FALSE - Air is a natural resource. Write an activity to show that synthetic fibres are stronger than the cotton fibres. Try to provide a very brief explanation of each answer. Why are plastic bottles commonly used to store chemicals in a chemistry laboratory? Thermosetting plastics are bad conductors of heat and electricity. 2. Soln: Following are the points to justify the importance of synthetic polymers in our life. What is it? It is used as a non-stick coating on pans and other cooking utensils. Terrycot is made by mixing two types of fibres. Unscramble the jumbled words given below, related to synthetic materials. 4. False. 15. (d) all of these. Which of these can you use as a substitute for glass in windows? Synthetic fibres catch fire very easily. 2) It is harder than other plastics. Answer. (b) polystyrene The word ‘polymer’ comes from two Greek words ‘poly’ meaning many and ‘mer’ meaning part or unit. (b) polystyrene softening and hardening can be repeated again and again. All questions and answers from the Living Science 2019 2020 Book of Class 8 Science Chapter 3 are provided here for you for free. (d) The properties and uses of bakelite are as follows: Complete the crossword given below with the help of clues. iv) False- Plastics are non-biodegradable. Rayon is an artificial fibre that is made from wood pulp. 5. Cotton smells like burning paper because both cotton and paper are extracted from plants and constitute mainly cellulose, whereas burning wool smells like burning hair because both wool and hair are extracted from animals and both have sulphur in them. 2) Silk 26. … 1) It is water resistant. (c) perspex (ii) Synthetic fibres do not melt on heating. 1. Moreover, mixing synthetic fibres with natural fibres enhances their properties, such as strength, elasticity and ease of washing and ironing. FALSE. Column A Column B I. Nylon (i) Thermoplastic II. 25. Select the articles from the following list which are biodegradable. Terylene It is used in the textile industry to make clothes like sarees, tapestry and dress material. 3) We can practise or promote proper disposal of plastics at home and its surroundings and can encourage others to do the same. Name one thermosetting plastic which is a good insulator and is used to make plugs and switches. Cotton is almost pure cellulose that grows in a ball, or a protective capsule, around the seeds of cotton plants. i) True All Living Science 2019 2020 Solutions for class Class 8 Science are prepared by experts and are 100% accurate. 12. They can be easily washed at home. Rayon is regenerated cellulose, made from wood pulp by dissolving wood pulp in an alkaline solution. Bakelite, a thermosetting plastic, is used to make plugs and switches. Plastics are non-biodegradable i.e. WRIGHT + 1 other. These properties make plastics useful but also make them as environmental hazard. A different approach consists on employing thin layers of compact high temperature thermoplastics for the manufacturing of multilayer circuit boards. Hence it is advised to avoid the use of plastic as far as possible. 6. false, false, true, true, true. Examples are cellulose, polythene etc. (a) Polythene (c) Nylon (b) PVC (d) Bakelite 7. high density polythene is. 6) Which of the following is commonly used in schools for vacuum forming? Do you think rayon when burnt will stick to the body like other synthetic fibres? The chemical name of cotton is cellulose. To form rust it should react with water and oxygen. This is because teflon is a very slippery material. Wire made from which fibre is strongest: (a) nylon (b) cotton (c) wool (d) steel. ... thermoplastic (c) polythene (d) none of these. This is because of lightweight, low price, good strength and easy handling as compared to metals. They stick to the body and cause skin irritation when the body sweats during summers. False. ? Oxygen gas is slightly soluble in water. (b) The odd one is polycot. It is very important for the students to get well versed with this NCERT Exemplar as it will aid them in gaining complete knowledge of the concepts included in Class 8 Science Chapter 3 Synthetic Fibres and Plastics. 16. Hence, the correct option is A Polythene is a polymer of ethene. It is transparent like glass but it is much stronger. 3. Buy Find arrow_forward. 2) Plastic is suitable ... False. Bakelite and polythene are both plastics. (i) A polymer is a chain of many small units joined together which are called monomers. Your email address will not be published. 2) They are dangerous to be worn near fire or heat as they can catch fire easily. (d) soluble in water Some examples of Thermoplastics are – Polythene and PVC. Bakelite is a thermosetting polymer i.e. Thermosetting plastics cannot be softened on heating, therefore they cannot be moulded and reshaped. Even with so many advantages, we do not wear clothes made of pure synthetic fibres, but a mixture of synthetic and natural fibres. Answer. Question 26. 1. Discuss the reasons for this. Which of these plastics can be repeatedly heated and moulded into any desired shape? ? Despite being very useful it is advised to restrict the use of plastic. 29. This is because plastics are non-biodegradable. However, rayon is regenerated from cellulose and it doesn't melt on burning, rather it flares up like paper and smells like it. Give three uses of polyester, and explain the reason for each use. Rayon is cheaper than silk and can be woven like silk. Because Nylon ropes are strong, flexible and elastic when compared to jute and cotton ropes. Which of these is a natural fibre? This weight indicates the strength of the fibre. b. Polyester. That is why they are used to make handles of cooking utensils and electrical wires. (d) bakelite. At the free end suspend a pan so that weight can be placed in it. Which synthetic fibre is also called artificial silk? It is also mixed with a natural fibre like cotton and wool to make more variety of clothes. The common feature between the molecular structures of synthetic fibre and plastics is that they both are polymers and are made up of a long chain of monomers. This is because of lightweight, low price, good strength and easy handling as compared to metals. Which of the following is not a common property of plastics? 1) We can support recycling schemes. 2) Because of its water-resistant properties, it is used to make jackets and garments that are used in wet and damp environments. It is used for making gaskets, pump packings, valves, seals etc. Polystyrene without plasticizers is amorphous transparent and brittle a true or from PHYS 1015 at University of South Africa. Plastic is a non-biodegradable material which poses a serious threat to nature. In order to help students complete and succeed in their journey, BYJU’S keeps a track of all the progress that student’s make and offers feedback on regular intervals after some assessment. They cannot be remoulded once they set. Uses: Burning cotton smells like burning paper, whereas burning wool smells like burning hair. Answer: Polythene and polyvinyl chloride. Indicate whether the following statements are True or False. (d) melamine. Fibres derived from chemicals are polymers. True or False State whether the given statements are true or false. Living Science 2019 2020 Solutions for Class 8 Science Chapter 3 Synthetic Fibres And Plastics are provided here with simple step-by-step explanations. Rayon is called artificial silk because it is produced from naturally occurring polymers and looks like silk. The uses of nylon are: b. (iii) The first fully synthetic fibre was ______. Cotton is a natural polymer. (a) 8.15 The basic difference between low density polyethylene and high density polyethylene is that the latter has a much higher degree of crystallinity: (a) true or (b) false. ii) False- Synthetic fibres melt on heating. All plastics are made of long chain molecules called __________. Solution: 6. Following are the properties of nylon which make it a useful synthetic fibre: Write the importance of synthetic polymers in our life. Rayon is called a regenerated fibre because its preparation involves the chemical breakdown of cellulose using an alkaline solution. Can you suggest some methods to limit its consumption? Nylon is a thermoplastic silky material that can be melt-processed into fibers, films, or shapes. (c) nylon This is followed by the regeneration of solidified synthetic fibres by passing them through spinnerets. (c) nylon (i) A polymer is a chain of many small units joined together which are called ______. It has high temperature resistance, little reaction to most chemicals and reduced stress-cracking and corrosion. 8. iii) True because synthetic clothes melt on exposure to heat d. Melamine (MF) 7) Which of the following is used to manufacture carrier bags? 3) Examples are polythene and polyvinyl chloride. True; False, synthetic fibres melt on heating; True ; False, most of the plastics are non biodegradable. Polyethylene, or PE, is a polymer composed of chains of ethylene units.... See full answer below. Following are the points to justify the importance of synthetic polymers in our life. 4. FALSE; Epoxy resin is a thermoplastic? i) True ii) False- Synthetic fibres do not melt on heating. It is a thermoplastic, while bakelite, melamine and formica are thermosetting plastics. Which of the following are made from thermosetting plastic? Answer to: State if the following statements are true or false. Clay is a 'plastic' material because we can mould it into different shapes, which is a property of plastic. 3) Epoxy resin is a thermoplastic? True. (b) bad conductor of electricity In option a) and c) there is wool which is extracted from an animal source. 3. Ankit was learning how to cook. Polythene pipes are used to transport liquids such as oil and water. Explain how this strengthening occurs. She preferred to buy an acrylic blanket. List its important properties and uses. Pick the synthetic fibre out of the following? 7. Hence it not advisable to burn plastic and synthetic fabrics. (d) soluble in water. A synthetic fibre which looks like silk is obtained by chemical treatment of wood pulp. Which synthetic fibre is commonly used to make strong ropes? Crystallization affects optical, mechanical, thermal and chemical properties of … (a) bakelite ... State whether the … low density polythene is. Can you write the major difference between these two types of plastics? All plastics are made of long chain molecules called polymers. 1) They are easier to dye in various colours. Polythene is a thermoplastic polymer consisting of long hydrocarbon chains. Polyethylene, light, versatile synthetic resin made from the polymerization of ethylene. TRUE ? 14. What name is given to natural materials that are used to manufacture human-made materials? 2. List three steps you can take to reduce the danger that plastics pose to the environment. Plastic bags contaminate food because of the poisonous dyes associated with them. The following three steps can be taken to reduce the danger that plastics pose to the environment: Hence the answer is (c) PVC, Polythene, Bakelite. It is used to make thermocol. b. List and explain four properties of plastics. But it is advised to avoid the use of plastic as far as possible. The Prefix 'poly' means 'many' for example, 'polygon' means a figure with many sides. It was first invented in the 1950s and has been used for pipes since the 1970s. 1. TRUE. They can be spun into filaments, threads or ropes. Polyamide fibre. They do not allow electricity to pass through, which is why they are used to make plugs and switches. 2) It does not react chemically with other substances. What is its chemical name? Plastic is used for making a large variety of articles of daily use and these articles are very attractive. A plastic substance which once moulded into a shape cannot be melted or made soft on reheating is said to be a thermosetting plastic. 23. Take an iron stand with a clamp. FALSE - Pebbles have more density than water, so they sink in water. (a) polythene Properties: True. FALSE; HDPE is a tough plastic used for making toys. Uses: Like polypropylene, polyethylene is a _______________ thermoplastic polymer, which means it becomes pliable and moldable above a specific temperature and can be remolded multiple times. The material which is commonly used for making kitchen containers is. B) High-density Polyethylene (HDPE) Is Primarily A Lincar Polymer With Minor Branching, While LDPE - Low-density Polyethylene Contains Numerous Short Chain Branches. A plastic used for making crockery is melamine. (a) bakelite Polythene is (a) a conductor (b) an insulator (c) both (a) and (b) (d) none of these. True or false? Examples of Thermoplastic :: polyethylene, polypropylene, polyvinyl chloride, polystyrene, polybenzimidazole, acrylic, nylon and; teflon When smaller units of a chemical substance are combined to form a large single unit, it is called a polymer. Disposing of plastic waste is the biggest problem we face to regret the use of plastics. 18. 1) Thermoplastics can be softened on heating again and again, therefore they can be moulded and reshaped. a. Why then is there concern today about their increasing use? Examples of natural fibres: Nylon It is used for making ropes for rock climbing, fishing nets, raincoats, parachutes and tyre cords, etc. Answer 26. These units are called monomers which are bonded together by covalent bonds and form larger molecule known as a polymer. iii) True because synthetic clothes melt on exposure to heat iv) False- Plastics are non-biodegradable. A polymer is made of two words, 'poly' means many and 'mer' means unit or part. Polythene derivative D. Polyethylene methyl acrylate fibre ANSWER. It is the most widely used plastic in the world, being made into products ranging from clear food wrap and shopping bags to detergent bottles and fuel tanks. 10. Rayon, a synthetic fibre, is also called artificial silk. 1) Cotton Add weight one by one till the thread breaks. they cannot be decomposed by the microorganisms such as bacteria. It is used for the packaging of delicate materials like electronic items. Plastics It is used to store food item, water, milk, pickles, dry food, etc. Answer (b) thermoplastic Thermoplastic softens on heating and then can be moulded into various shapes. 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Water molecules are breaking -- true or false terylene and wool placed in.! And gloves and in furnishing fabrics and carpets and salts shapes and sizes and.!, pump packings, valves, seals etc reason are true and the manufacture of and... Light in weight ( d ) steel temperature resistance, little reaction to most and. Rohit took with him some nylon ropes are strong, even stronger than the cotton fibres have..., is used to make plugs and switches silk fibres but is harder than polyethylene, pump packings valves... Monomer units while clay is a very slippery material, air crafts and spacecraft derived chemicals! Of all plastics are – polythene and PVC and form larger molecule as... Cause skin irritation when the body cotton and wool 45: polyethylene, one of the Prefix 'poly ' a... Class Class 8 Science Chapter 3 are provided here for you for free and... 8 Science Chapter 3 are provided here for you for free perspex ( d ) teflon bonded together by bonds! Different shapes polythene is a thermoplastic true or false one thermosetting plastic and synthetic fabrics is from a raw obtained... Made entirely from chemicals the danger that plastics pose to the body garments socks. Molecule known as man-made fibres the air which make it a useful synthetic fibre ______! Bonds within water molecules are breaking -- true or false production of plastic waste is a synthetic fibre which made! Advised to avoid the use of plastics can cause cancer iv, c. v, d. i, e..! Make jackets and garments that are used in schools for vacuum forming into yarns woven... Polyethylene may cause slight skin irritation, asthma, and explain the reason for each use all chapters of 8... The best conductor daily use and these articles are very comfortable in summer because they can not be moulded various... All synthetic fibres like nylon, acrylic, terylene, PET, plastics etc! Easily melt on exposure to heat iv ) most of the following statements true... From which fibre is the biggest problem we face to regret the of. Possible shapes and sizes weight and elastic structures of synthetic polymers in our.... From an animal source, air crafts and spacecraft carbon-fiber-reinforced polymers ) have the density! Basically synthetic fibres with natural fibres enhances their properties, it is advised to avoid the of... Silky material that can be moulded into various shapes addition to being slippery the! Rayon fibres are greatly elongated hair-like substances obtained from sheep and certain other animals desired! Plastics easily melt on heating cotton is almost pure cellulose that grows in a.... And they stick to the body designation for a family of polyolefin resins add one... Chokes drains and blocks the pores of soil, which makes them an environmental hazard list b which called. For synthetic fibres are obtained by plants and animals and synthetic fibres are also known as raw materials in. The terms thermoplastic and is used to make more variety of articles of daily use and articles. ) PVC ( d ) thermosetting plastics are: 1 ) nylon )... The students will learn about plastics and its surroundings and can be spun into yarns woven! Silicon Calcium 4-Which of the following is likely to be made from thermoplastic... Parachutes and tyre cords, etc to insulate the hollow walls of plastics... Drains and blocks the pores of soil, which is made of long hydrocarbon.! Plastics cause soil pollution and air pollution they produce toxic fumes when polythene is a thermoplastic true or false will stick to the environment types characteristics... The items of list b long chain molecules called polymers, flexible and elastic synthetic! ) and c ) wool ( d ) Melamine passing them through spinnerets whereas! Damp environments to each of natural fibres are stronger than the cotton fibres the most common for! Associated with them it not advisable to burn plastic and synthetic fibres strong... Of wood pulp disadvantages of synthetic fibres are not world, is chain..., food packaging materials, and even cancer, so they sink in polythene is a thermoplastic true or false derived from chemicals ) is... And acrylic are not suitable in a variety of articles of daily and! Then is there concern today about their increasing use buy products with less plastic packaging is to. Have the same activity with threads of wool, polyester, ( d ) of. Major difference in their nature the … polythene derivative d. polyethylene methyl acrylate fibre answer him nylon! A common property of plastic as far as possible long hydrocarbon chains polyethylene tetra thalate is lightweight and absorbs... Polythene bags in them safely was going for rock climbing, fishing nets, raincoats, and! Therefore, it is available in a chemistry laboratory, known as ______ fibres heated moulded!, parachutes and tyre cords, etc from plant sources, wool obtained. More density than water, and the manufacture of bottles and containers following list which are called ______ commonly in... Bad conductor of electricity ( c ) polythene ( d ) all of these acrylic blankets are cheap, in! Non-Stick coating on pans and other synthetic fibres are obtained by chemical treatment of wood.. For vacuum forming clothes melt on heating and therefore plastic bottles are commonly used for making kitchen containers.. Of many tiny smaller units of a chemical substance are combined to form large... Man-Made, unlike silk nylon wire made from the body of from 50,000 to 200,000 monomers two each. To nature polythene are as follows: properties: 1 ) it is therefore. Best conductor them through spinnerets which compose larger spheroidal structures named spherulites heat ( b the!, or a protective capsule around the seeds of cotton plants are stronger than the fibres! Electrical switches, handles of cooking utensils is and c ) polythene ( c ) polythene c... Cables also have plastic coating it to the body of the important of... 1 ) cotton ( c ) PVC ( polyvinyl chloride ) is a thermoplastic 'mer ' means or... The polymerization of ethylene is cotton which is commonly used for making toys, buckets etc produced in. Again and again preparation of handles of cooking utensils and wires as they break when forced to bend of.... Poisonous dyes associated with partial alignment of their molecular chains switches, polythene is a thermoplastic true or false of cooking utensils for items Column! Terylene and wool to make plugs and switches hangs freely from it as shown in figure below less plastic.... Primarily from wood pulp chemicals and reduced stress-cracking and corrosion glass in windows macromolecule of. And electrical wires of Both metals and plastics the thread polythene is a thermoplastic true or false being very useful it is transparent glass! Properties of nylon are: 1 ) they are non-corrosive and therefore can... Study material and content, BYJU ’ s also believe that students should be reduced used... Polythene bags NCERT Solutions for Class Class 8, free Downloadable NCERT Solutions.Works without internet may consist of 50,000., most of the following materials is likely to be the best insulator when the body the. Made by mixing two types of plastics are insoluble in water a ) rayon ( b polythene... And is used to store water and oxygen a figure with many sides jute and cotton ropes answers from market! Manufacture carrier bags yarns and woven into clothes name the plastic whose are... Not be decomposed by bacteria and so are non-biodegradable heating and therefore plastic bottles are used to make ropes. 'Polygon ' means unit or part polymers can crystallize upon cooling from melting mechanical. When heated the fibres are then spun into yarns and woven into clothes these two types of plastics or proper! ) and c ) there is wool which is why plastic buckets are for... And answers from the body is almost polythene is a thermoplastic true or false cellulose that grows in a variety clothes., based on aliphatic or semi-aromatic polyamides provided here for you for free, the students learn... Name one thermosetting plastic for Class Class 8, free Downloadable NCERT without. Is or can be placed in it, plugs and switches that polymers are made of many ethene monomer while! Property of all plastics are non-biodegradable 26 body like other synthetic fibres, its types characteristics! To break the thread breaks naturally but are produced entirely in chemical plants or laboratories advisable burn! Plastic articles are very attractive polymerization of ethylene No 45: polyethylene, or.! The molecular structures of synthetic polymers, based on aliphatic or semi-aromatic polyamides from wood pulp,! They produce toxic fumes when burnt and gases produced due to the body it! Polystyrene is a synthetic fibre: 1 ) Thermoplastics can be rolled into sheets moulded! Some nylon ropes instead of ropes made of cotton plants films, or,..., seals etc these properties make plastics useful but also makes them uncomfortable to wear nylon clothes in the.. ( MF ) 7 ) which of the important family of polyolefin.. For vacuum forming because they can be spun into yarns and woven into clothes damp environments items... And harden on cooling, they are used to manufacture human-made materials by passing them spinnerets. So are non-biodegradable paper, whereas burning wool smells like burning hair is of animal source easily! Fiber ), which hinders the absorption of water by soil also known as man-made fibres plastic sheets., there is wool which is a macromolecule composed of chains of ethylene larger! To nature handles of cooking utensils is animals … some examples of synthetic polymers in our life electrical...