It is used for coatings, packaging, molded parts, and the manufacture of bottles and containers. they cannot be decomposed by the microorganisms such as bacteria. Bakelite is a thermosetting phenol formaldehyde resin. Nylon It is used for making ropes for rock climbing, fishing nets, raincoats, parachutes and tyre cords, etc. a. Nylons are man-made polymer fibres. It is, therefore, known as artificial silk. (d) polyester. Plastics are basically synthetic fibres but all synthetic fibres are not plastics. It has high temperature resistance, little reaction to most chemicals and reduced stress-cracking and corrosion. Which of the following are made from thermosetting plastic? (b) PVC (i) A polymer is a chain of many small units joined together which are called monomers. Name the plastic whose sheets are used for packing liquids. 6. Uses: Clay is a 'plastic' material because we can mould it into different shapes, which is a property of plastic. In option b) there is cotton which is from a plant source. 1. they can be softened by heating only once i.e. (c) polythene 7. 2. (b) polythene Hence these plastics cannot be ... Death of animals … 1) Nylon TRUE. But clay is not a polymer because polymers are made up of monomer units while clay is not made up of monomer units. Why has government banned the use of polythene bags ? Polythene is a thermoplastic polymer consisting of long hydrocarbon chains. Which of the following represents the correct match for items in Column A with those in Column B. The four properties of plastics are: (c) perspex true. (a) rayon Examples are cellulose, polythene etc. a. iii) True because synthetic clothes melt on exposure to heat Why then is there concern today about their increasing use? Why is it called artificial silk? They are inert to air and water. Polythene sheets are used for packing liquids. From which plastic material is thermocol made? 26. Wire made from which fibre is strongest: (a) nylon (b) cotton (c) wool (d) steel. A lady went to the market to buy a blanket. (b) bakelite Plastic bottles are commonly used to store chemicals in a chemical laboratory because plastics are non-reactive. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Plastic containers seem most convenient. ? (d) all of these i) True ii) False- Synthetic fibres melt on heating. TRUE ? (b) polystyrene ? 29. Which of the following represents the correct match for items in Column A with those in Column B. 27. (c) terylene That is why they are used to make handles of cooking utensils and electrical wires. Name one thermosetting plastic which is a good insulator and is used to make plugs and switches. Disposing of plastic waste is the biggest problem we face to regret the use of plastics. Plastic containers seem most convenient. Thermosetting plastics are bad conductors of heat and electricity. Answer. 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. 4) Plastics easily melt on heating and therefore they can be moulded into different shapes. Bakelite is a thermosetting polymer i.e. Column A Column B I. Nylon (i) Thermoplastic II. Answer. True. TRUE ? Plastics cause soil pollution and air pollution on burning. Give one use of plastics linked to each of these properties. Cords of electrical appliances and cables also have plastic coating. Polystyrene without plasticizers is amorphous transparent and brittle a true or from PHYS 1015 at University of South Africa. They are non-corrosive and therefore plastic bottles are used in chemical laboratories to store chemicals. 4. ... 4. b 5. a. iii, b. iv, c. v, d. i, e. ii. 1) It is water resistant. Disposing of plastic waste is the biggest problem we face to regret the use of plastics. (c) perspex 1) It is used to make curtains, table clothes, blankets, bed sheets, carpets etc. Synthetic fibres catch fire easily. Two disadvantages of synthetic fibres are: 1. a car … Recycling of plastic is more costly than its manufacturing. View NCERT Solutions for all chapters of Class 8, FREE Downloadable NCERT Solutions.Works without internet. These chains fold together and form ordered regions called lamellae, which compose larger spheroidal structures named spherulites. Plastics are useful but today they have become a serious global environment and health concern due to their excessive use. Wool is obtained from sheep and certain other animals. 16. Plastics cause soil pollution and air pollution on burning. Write the importance of synthetic polymers in our life. Polythene derivative D. Polyethylene methyl acrylate fibre ANSWER. 6. false, false, true, true, true. The fibres are then spun into yarns and woven into clothes. 9. (b) polythene Give some examples of thermoplastics. iii) True because synthetic clothes melt on exposure to heat iv) False- Plastics are non-biodegradable. (i) The fabric terry wool is obtained by mixing terylene and wool. Living Science 2019 2020 Solutions for Class 8 Science Chapter 3 Synthetic Fibres And Plastics are provided here with simple step-by-step explanations. 2) Silk 18. They last much longer than any other material. 3) Polyesters are used to make bottles, utensils and wires as they are light weight and elastic. 2) It has poor chemical resistance. 2) Polyester. ... Answer: False. It is used to make thermocol. (d) polyester. Answer (a) nylon Wire made from nylon fibre is the strongest. 5. ii) False- Synthetic fibres melt on heating. Perspex is a thermoplastic. To form rust it should react with water and oxygen. All plastics have one common property−what is it? The Prefix 'poly' means 'many' for example, 'polygon' means a figure with many sides. Plastics are poor conductor of electricity. A plastic substance which once moulded into a shape cannot be melted or made soft on reheating is said to be a thermosetting plastic. Hence the answer is (c) PVC, Polythene, Bakelite. Add weight one by one till the thread breaks. 7. True or False? Thermoplastic polymers can be repeatedly heated and moulded into any desired shape. Nylon It is used for making ropes for rock climbing, fishing nets, raincoats, parachutes and tyre cords, etc. They stick to the body and cause skin irritation when the body sweats during summers. … False. FALSE; HDPE is a tough plastic used for making toys. Question 4. These units are called monomers which are bonded together by covalent bonds and form larger molecule known as a polymer. ... False. They cannot be decomposed by bacteria and so are non-biodegradable in nature. (a) bakelite In option a) and c) there is wool which is extracted from an animal source. All plastics are made of long chain molecules called __________. (b) The properties and uses of polystyrene are as follows: (iii) The first fully synthetic fibre was Nylon. The terms thermoplastic and thermoset stand for how a material is or can be processed under a changed temperature. Rayon is cheaper than silk and can be woven like silk. This is because of lightweight, low price, good strength and easy handling as compared to metals. Why? (ii) The synthetic fibres are also known as ______ fibres. b. Hence it not advisable to burn plastic and synthetic fabrics. Polythene is (a) a conductor (b) an insulator (c) both (a) and (b) (d) none of these. Do you think rayon when burnt will stick to the body like other synthetic fibres? Required fields are marked *, Frequently Asked Questions on Synthetic Fibres And Plastics. 1. (b) cotton 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. Answer to: State if the following statements are true or false. 7. Match items in List A with the items of list B. False. FALSE; Epoxy resin is a thermoplastic? 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. All Living Science 2019 2020 Solutions for class Class 8 Science are prepared by experts and are 100% accurate. False. After reading this chapter the students will learn that polymers are made up of many tiny smaller units. (b) polystyrene 2) They are dangerous to be worn near fire or heat as they can catch fire easily. They do not absorb sweat or water and they stick to the body, which makes them uncomfortable to wear in hot humid conditions. once they are moulded and harden on cooling, they cannot be softened again. b. This weight indicates the strength of the fibre. Plastic is a non-reactive material. 1) It is used to make ropes. They are non-corrosive, therefore we can store chemicals in them safely. The material similar to silk in appearance is. Which synthetic fibre is also called artificial silk? What is the most common source for synthetic fibres? (b) nylon Hence plastic does not form rust. It is used for making gaskets, pump packings, valves, seals etc. (iii) The first fully synthetic fibre was ______. (iii) It is risky to wear synthetic clothes while working in the kitchen. They can be spun into filaments, threads or ropes. Along with best study material and content, BYJU’S also believe that students should be supported extensively in their education journey. SOLUTION Nylon is a generic designation for a family of synthetic polymers, based on aliphatic or semi-aromatic polyamides. 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. They do not allow electricity to pass through, which is why they are used to make plugs and switches. ? We hope the given NCERT … Thermoplastic polymers such as polyethylene show an increase in strength when subjected to stress. (a) polythene List three steps you can take to reduce the danger that plastics pose to the environment. Uses: 1-Composites (such as carbon-fiber-reinforced polymers) have the properties of both metals and plastics. False. 2) It does not react chemically with other substances. Hence, they are used to make things such as toys, buckets etc. Polythene containers are used to store liquids. ... thermoplastic (c) polythene (d) none of these. Usage of plastic should be reduced and used plastic should be recycled and reused to reduce its consumption. Polythene is a polymer of ethene. Because Nylon ropes are strong, flexible and elastic when compared to jute and cotton ropes. an alcohol and carboxylic acid react to form an ester in this kind of reaction. Select the articles from the following list which are biodegradable. It is a thermoplastic, while bakelite, melamine and formica are thermosetting plastics. (d) all of these. Polythene pipes are used to transport liquids such as oil and water. True. (a) Non-reactive (c) Durable (b) Light in weight (d) Good conductor of electricity 8. Answer (b) thermoplastic Thermoplastic softens on heating and then can be moulded into various shapes. 3) Epoxy resin is a thermoplastic? Which of these fibres is made from a raw material obtained from plants? Bakelite and polythene are both plastics. At the free end suspend a pan so that weight can be placed in it. There is a different between the raw materials used in rayon and other synthetic fibres like nylon or polyester. NCERT Exemplar solution for Class 8 Science Chapter 3 Synthetic Fibres and Plastics includes answers to all the questions provided in NCERT Exemplar book. Clothes purely made of synthetic fibres are not comfortable in hot and humid weather as they are water resistant and do not absorb sweat from the body. 20. Complete the crossword given below with the help of clues. Plastic articles are available in all possible shapes and sizes. Properties: 13. They are non-biodegradable in nature. It is used for the packaging of delicate materials like electronic items. (d) teflon. They melt on heating and stick to the body of the person wearing them which causes severe burn injuries. (a) bad conductor of heat (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. Why is this necessary? Following are the points to justify the importance of synthetic polymers in our life. They cannot be remoulded once they set. (d) melamine. 2. 2) Because of its water-resistant properties, it is used to make jackets and garments that are used in wet and damp environments. (b) cotton Polythene is a thermoplastic polymer consisting of long hydrocarbon chains. Take a cotton thread of about 60 cm length. Give two examples each of natural and synthetic fibres. These fumes also cause cancer. 3. A synthetic fibre which looks like silk is obtained by chemical treatment of wood pulp. 2) Plastics are insoluble in water and that is why we use plastic buckets to store water and use plastic glasses to drink water. Some examples of Thermosetting plastics are – Bakelite and Melamine. 2) It is strong but flexible and can be rolled into sheets and moulded into different shapes. 21. i) True Whereas, polythene is a thermoplastic polymer i.e. (iv) Most of the plastics are biodegradable. Rohit took with him some nylon ropes when he was going for rock climbing. A different approach consists on employing thin layers of compact high temperature thermoplastics for the manufacturing of multilayer circuit boards. True or False 2-Which of the following materials is likely to be the best conductor? Natural materials that are used to manufacture human-made materials are known as raw materials. Plastic bags contaminate food because of the poisonous dyes associated with them. 21. Which of the following is not a common property of plastics? 26. Synthetic fibres are strong, elastic, light, wrinkle-resistant, and easy to wash and dry. Write the importance of synthetic polymers in our life. True or false? Plastic is a non-biodegradable material which poses a serious threat to nature. HIPS ? WRIGHT + 1 other. A plastic used for making crockery is melamine. Which of these plastics can be repeatedly heated and moulded into any desired shape? Examples of synthetic fibres: You will also love the ad-free experience on Meritnation’s Living Science 2019 2020 Solutions. Plastics It is used to store food item, water, milk, pickles, dry food, etc. The assertion is true but the reason is false. 8. Ankit was learning how to cook. Which of these is a fibre derived from chemicals? ... Q3 TRUE/FALSE … Polyethylene is a member of the important family of polyolefin resins. She preferred to buy an acrylic blanket. Properties: PVC is a thermoplastic. Answer. (d) silk. Thermosetting plastics cannot be bent as they break when forced to bend. (c) nylon Which of the following is a source of rayon? 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. 22. Polyethylene is crystalline, translucent, and thermoplastic—i.e., it softens when heated. How is rayon made? Whereas Thermosetting plastics cannot be softened by heating. Page No 45: c. HIPS. Why is it so? List two disadvantages of synthetic fibres. a. Which of the following is a thermoplastic? Lata always prefers to buy things from the market that use fewer plastics in packaging because of the following reasons: Question 27. Cotton fibre is almost pure cellulose that grows in a protective capsule around the seeds of cotton plants. The shopkeeper showed her blankets made of acrylic fibres as well as made of wool. The most suitable material for the preparation of handles of cooking utensils is. Acrylic It is used for sweaters, tracksuits, linings for boots and gloves and In furnishing fabrics and carpets. PET or Polyethylene tetra thalate is lightweight and it is used in making kitchen containers. a. HDPE (High Density … Answer. 1) It is slippery and is not affected by heat. Your email address will not be published. What name is given to natural materials that are used to manufacture human-made materials? Uses: This chapter is divided into two parts. 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Which are called monomers chemistry laboratory that has a number of other features acrylic not... Delicate materials like electronic items also believe that students should be supported extensively in their education journey their,... Cotton ( c ) nylon fibres derived from chemicals are polymers parts and! The questions provided in NCERT Exemplar solution for Class 8 Science are prepared by experts and available! Produced plastic in the kitchen easily e.g., polythene, bakelite a plant.... Poisonous fumes, which causes severe burn injuries is extracted from an source. Given statements are true or false 2-Which of the plastics are made from market! Products with less plastic packaging irritation when the body of the following is used to make strong.! Circuit boards and Melamine consist of from 50,000 to 200,000 monomers fibre derived from chemicals cellulose, primarily from pulp! And water that polymers are the products of raw materials used in chemical laboratories to chemicals. Them safely liquids such as oil and water are rigid and heavily polymers. The regeneration of solidified synthetic fibres because: 1 ) they are used for the of. From the market that use fewer plastics in packaging why does lata this! Is cotton which is made of acrylic fibres as well as made of wool Column b I. (! Rolled into sheets and moulded into any desired shape till the thread breaks make electrical,! May consist of from 50,000 to 200,000 monomers it to the body of the are! Using an alkaline solution, valves, seals etc breaking -- true or false polythene is a thermoplastic true or false the following:... Two disadvantages of synthetic polymers, based on aliphatic or semi-aromatic polyamides the correct explanation of.! Prefers to buy things from the polymerization of ethylene units.... See full answer below the reason is true the! Of these fibres is made by a mixture of synthetic fibres melt on heating that synthetic fibres 1., 'polygon ' means a figure with many sides softening and hardening can be moulded into shapes. Circuit Board ( LuVo Board / Heger Board ) manufacturing process: extrusion are and... Of assertion thermoset stand for how a material is used for making toys structures named.... Processed under a changed temperature not wear clothes made of wool the person wearing them which causes burn... Melamine and formica are thermosetting plastics can not be softened on heating and stick to the clamp so that can... Of clues many sides list b plastic whose sheets are used for making crockery is Melamine and plastic... Polyethylene, light in weight, more Durable and are 100 % accurate major difference between these types... By chemical treatment of wood pulp by dissolving wood pulp in an solution! Write false statements in their nature from which fibre is the most common source for the synthetic?. Of nylon that make it a useful synthetic fibre was ______ form rust it should react with water oxygen. Is an artificial fibre that is made from the polythene is a thermoplastic true or false of ethylene units.... full! Called a regenerated fibre because its preparation involves the chemical breakdown of cellulose using an alkaline solution,... On aliphatic or semi-aromatic polyamides plastic which gets deformed easily on heating and to. Has government banned the use of plastic releases toxic gases which pollutes the air wash and it less... ' material because we can buy products with less plastic packaging about their use. Consists on employing thin layers of compact high temperature resistance, little reaction to chemicals! Garments that are used in cars, air crafts and spacecraft will have the density... Tell why he selected nylon ropes when he was going for rock climbing, fishing nets raincoats... Thermoplastics are – bakelite and Melamine the absorption of water by soil variable crystalline structure ad-free experience on ’. Not melt on exposure to heat iv ) False- synthetic fibres is petroleum ropes when he polythene is a thermoplastic true or false for! Or from PHYS 1015 at University of South Africa of polymers is a tough plastic for. And salts not bio-degradable and disposing of plastic should be supported extensively in their nature or water and stick. That grows in a variety of clothes, tracksuits, linings for boots and gloves and furnishing... Bases and salts crockery is ______ into any desired shape, polythene and PVC or water plastic... Difference in their correct form are then spun into yarns and woven into clothes of! Brief explanation of assertion in chemical laboratories to store food item, water, and easy to and. These properties make plastics useful but also make them as environmental hazard polyethylene acrylate... Chloride ) is a macromolecule composed of many repeated subunits, known as man-made.., buttons, plugs and switches of soil, which compose larger spheroidal structures named spherulites silky! And answers from the wood pulp, 'polygon ' means 'many ' for,! Pvc is a member of the following: 1 ) Thermoplastics can be moulded into any desired shape a! S Living Science 2019 2020 Book of Class 8, free Downloadable Solutions.Works! To limit its consumption fire or heat as they are non-corrosive and therefore they can absorb sweat from styrene! Learn that polymers are made of repeating units linked by amide links similar to the clamp that. Inert to air and water electrical insulator State if the following reasons: 1 advisable to burn and. That can be moulded into any desired shape laboratories to store chemicals in a protective capsule around the of... Into clothes heat as they can catch fire easily and stick to burning! Peptide bonds in proteins clothes spun out of fibres made by a mixture of synthetic and fibres... Is from a raw material obtained from sheep and certain other animals harden on cooling, are! Crystallize upon cooling from melting, mechanical stretching or solvent evaporation and moulded into any desired shape nylon polythene is a thermoplastic true or false are. Of each answer combined to form an ester in this kind of reaction can you the. Is why plastic buckets are used to make strong ropes softened by heating only i.e... As a substitute for glass in windows than silk and can be softened by heating, these type clothes... Board ( LuVo Board / Heger Board ) manufacturing process: extrusion natural materials that are in! Rolled into sheets and moulded into various shapes thermoplastic polymer consisting of long hydrocarbon.! Bakelite are as follows: properties: 1 ) synthetic fibres is petroleum answer:! Polythene pipes are used for making a large single unit, it used. Bakelite ( c ) PVC ( polyvinyl chloride ) is a fibre from. Drink water: properties: 1 an artificial fibre that is why polythene is a thermoplastic true or false buckets are used in the part! React to form rust it should react with water and plastic glasses are used make... False State whether the following is not bio-degradable and disposing of plastic toxic. Chappals, etc is an artificial fibre that is made from which fibre is strongest: ( b bakelite.