why synthetic clothes catch fire easily

        (a) Cotton                           (b) Wool,         (c) Rayon                            (d) Ketone. Question: What is the chemical nature of polyester? Which synthetic fibre is also called artificial silk? It is used for making gaskets, pump packings, valves, seals etc. Blockage and choking of drains and sewer lines .Â. Natural fibres are greatly elongated hair-like substances obtained from plants or animals. Which of the following is a natural fiber? Thermal conductivity 5. Why is it not advisable to wear clothes made up of synthetic fibres in hot and humid weather? done clear. This burned cloth can stick to our body.we must never wear synthetic clothes inside a kitchen. (b) cotton Which plastic material is used to make non-stick pans? (d) polyvinyl chloride. 2) Plastics are insoluble in water and that is why we use plastic buckets to store water and use plastic glasses to drink water. Synthetic fibers are obtained by chemical processing of petrochemicals. It is manufactured regenerated cellulose fiber. 1) It is water resistant. 2. Like polythene, is a non-biodegradable substance which means that microorganisms cannot decompose them. Answer: mountaineers use nylon ropes for climbing the mountains because nylon is a high strength fiber so it does not break easily. 1) It is slippery and is not affected by heat. These are used for manufacturing toys, combs, car grills and various types of containers. 6. Answer: Dry leaves catch fire easily because they do not contain water due to which it takes less time to catch fire. (b) polystyrene Uses: (d) Both (b) and (c). They are inert to air and water. Which property of plastics makes them so useful but also makes them an environmental hazard? Why is it not advisable to wear clothes made up of synthetic fibres in hot and humid weather? Besides this an improper disposal of polythenes leads to following environmental problems:  The lesson covers all important questions based on Synthetic Fibres and Plastics. Action of heat and flame 4.          (c) nylon                              (d) thermosetting polymer, 13. (a) polythene Answer: Nylon Look around and make a list … a. The usefulness or otherwise of a synthetic material depends upon the following properties. Question: Write advantages of using plastic containers for storing food? Thermosetting plastics: These are those which once molded can’t be softened on heating. This is because teflon is a very slippery material. These units are called monomers which are bonded together by covalent bonds and form larger molecule known as a polymer. All Living Science 2019 2020 Solutions for class Class 8 Science are prepared by experts and are 100% accurate. (d) all of these.           (a) layers                                 (b) molecules Repeat the same activity with threads of wool, polyester, silk and nylon. Which fiber is used as artificial wool? Polythene pipes are used to transport liquids such as oil and water. Plastics can be recycled, reused, colored melted, rolled into sheets or made into wires. 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Differentiate between thermoplastics and thermosetting plastics.          (a) plastic                                (b) wool Clay is a mixture of compounds. Plastics are very useful materials. Clay is a 'plastic' material. View Answer. (a) bakelite Clothes are added with N2, P, or Halogens Cl, Br, Methyl, Ethyl groups or Phosphates to reduce the inflammability. 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Whereas nylon or polyester, fibers are purely synthetic polymers, made entirely from chemicals. They are inflammable. 4. Which of these is not a property of plastics? All plastics are made of long chain molecules called polymers. 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. For example Nylon 66 variety does not catch fire even above 100 deg C. The most common source for the synthetic fibres is petroleum. Plastic is made from petroleum and natural gas.   How is rayon made? (c) terylene Bakelite is used for making electrical switches, handles of various utensils etc. synthetic fibers (acrylic, nylon, lastol,olefin, polyester, and spandex) can burn quickly when ignited, but. The fabric melts and sticks to the body of the person wearing it. Answer: We should avoid wearing synthetic clothes while cooking because synthetic clothes catch fire easily and melt before burning. If the clothes catch fire, it can be disastrous. Which synthetic fibre is commonly used to make strong ropes? Plastic is also defined as a material that can be heated and molded in any shape after cooling. The Prefix 'poly' means 'many' for example, 'polygon' means a figure with many sides. Lata always prefers to buy things from the market that use fewer plastics in packaging because of the following reasons: We have seen that those plastic covers do not cause any kind of electric shock when you touch it. Q14: What happens when synthetic fibres catch fire? D) Both (b) and (c). All the synthetic fibres are prepared by a number of processes using raw materials of petroleum origin, called petrochemicals. In hot and humid weather, these clothes stick to the body and make us feel uncomfortable. The material obtained from natural sources is quite expensive whereas materials made from acrylic are relatively cheap. PET (Polyethylene terephthalate), the commonly used polyester, is made from two monomers by condensation polymerization. Which of the following is non-biodegradable? The topics we will cover in this chapter are as follows: All clothing material called fabric is woven out of fibres. It is therefore advised not to wear synthetic clothes while working in a laboratory or working with fire in the kitchen. Answer: Petro chemicals          (a) Paper                              (b) Cotton cloth,          (c) Wood                             (d) Plastic. Whereas, polythene is a thermoplastic polymer i.e. Ans.The synthetic fibres melt on heating. to book questions have also been provided for ease to the students. Some of the most important properties of synthetic materials are as follows: 1. (a) rayon They do not occur naturally but are produced entirely in chemical plants or laboratories. Some of the plastic has linear arrangement, while some has cross linked. There are some plastics which when molded once cannot be softened by heating again and again. Synthetic fibers are synthesized from raw material called ……….. Like synthetic fibers, plastic is also a ……….. Give examples which indicate that nylon fibers are very strong. Give three uses of polyester, and explain the reason for each use. Give reason? Why has government banned the use of polythene bags ?Â, Polythenes or plastic bags are non biodegradable. The uses of rayon are: 3) Polyesters are used to make bottles, utensils and wires as they are light weight and elastic. Properties: View Answer. Polymers are made up of small units called _____,           (a) layers                                 (b) molecules,           (c) cells                                   (d) monomers, 04. Synthetic fibers synthesized from raw materials are called _____ It is used for making bottles, utensils, films, wires and many other useful products. Acrylic, nylon, polyester come from oil and coal. What is it? Tensile strength 2. (a) rayon          (a) man-made fibre               (b) natural fibre Fiber produced in factories is called ______ What is the other name for artificial silk? A) Synthetic fibres catch fire very easily. Flame-retardant chemicals sometimes are added to clothing, to make it particularly resistant to fire. Polythene is a thermoplastic polymer consisting of long hydrocarbon chains. They produce toxic fumes when burnt and gases produced due to the burning of plastics can cause cancer. Bakelite and polythene are both plastics. e. Kitchen/laboratory. The lesson covers the complete, . Thermoplastic polymers can be repeatedly heated and moulded into any desired shape. It is also called as viscose rayon and artificial silk. For example: Polythene. Plastic bottles are commonly used to store chemicals in a chemical laboratory because plastics are non-reactive. It remains crisp and is easy to wash. Fibre obtained by chemical … Burn injuries can lead to permanent scarring, disability and even death. They do not absorb sweat or water and they stick to the body, which makes them uncomfortable to wear in hot humid conditions. Synthetic fibers melt on heating. They last much longer than any other material. })(window, document); Your email address will not be published. Which fiber is used as artificial wool? The word ‘polymer’ comes from two Greek words ‘poly’ meaning many and ‘mer’ meaning part or unit. Your email address will not be published. ... and are long lasting. Synthet-ics may catch fire quickly or shrink from the flame initially, but ultimately, they will sputter, flame, and melt to the skin or … They are used in making handles of utensils, floor tiles etc. They are inflammable.          (c) fibre                                  (d) elastomer, 08. Rayon is a manufactured regenerated cellulose fibre that is made from purified cellulose, primarily from wood pulp. For example: Polythene. d. Inflammable. Thermocol is made from polystyrene plastic. A polymer is made of two words, 'poly' means many and 'mer' means unit or part. Terylene is a type of popular polyester. b. (i) poor conductors of electricity Answer: PVC Besides this an improper disposal of polythenes leads to following environmental problems:Â, 2. 9. Melamine is ______         (a) Saucepan handles It has capacity to bear weight and helps the mountaineers to climb. 1. (b) nylon they can be softened by heating only once i.e. Which of these plastics is a polymer? What is the name of regenerated synthetic fiber? It is used as a substitute for glass in windows. It is also used as linings for boots and gloves as well as in furnishing fabrics and carpets. e. Clothes made of synthetic fibers should not be worn in ______ Plastic is not environment friendly. This means that anything that harms the environment should not be utilized or we should limit the use of that particular substance. d. Synthetic fibers catch fire easily so they are _______ .  For example: Bakelite etc. Uses: Give one use of plastics linked to each of these properties.           (c) cells                                   (d) monomers, 04. A) Synthetic fibres catch fire very easily. What is the most common source for synthetic fibres? It is used in the manufacturing of various machine parts. (d) polyester. They are easy to maintain and do not need extra care. 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. It is obtained from wood pulp. The common property of all plastics is that they are all made up of polymers. There are certain fibers which are obtained from plants and are known as vegetable fibers. The uses of polyester are as follows: Synthetic Clothes contain a lot of Hydrogen (of course Carbon too). Which of these can you use as a substitute for glass in windows? I synthetic fibres. But then later I found myself asking: why do natural fibers burn but synthetic ones don't? Polymers are made up of small units called _____ Which of the following is natural fibre obtained from plants? Digging around on Wikipedia didn't reveal any easy answers. Sweat. It does not catch fire easily and does not burn as quickly as other materials. Both types of clothes burn, and the rate of burn largely depends on the density of the material, but a synthetic material like acrylic, for instance, will burn faster than wool. Which artificial fibre is made from wood pulp? Does this imply that it is a polymer? This is because plastics are non-biodegradable. So, it is quite suitable for making dress material. Take the pieces out of the containers after five minutes and spread them in the sun for a few minutes. For example: Plastic, polybags, clothes. It can be drawn into very fine fibers that can be woven like any other yarn. Synthetic fibers and plastics are made up of molecules called polymers. (b) polythene Synthetic fibres catch fire very easily. Plastics are non- biodegradable and do not decompose for several years. 2) They are dangerous to be worn near fire or heat as they can catch fire easily. List three steps you can take to reduce the danger that plastics pose to the environment. 3. done clear. d. ______ burns readily with the smell of burning paper.Â, e. ______ shrinks if burnt and forms a black bead a long with sooty flame.Â, c. Nylon is prepared from simple chemicals obtained from ______ .Â, d. Polyester is made from ______ products.Â, e. ______ is called a regenerated fiber.Â. This is actually a disadvantage with synthetic Fibres. These are also known as man-made fibers. Add weights one by one till it breaks. softening and hardening can be repeated again and again. These include 2: … 9. ______ burns slowly with the smell of burning hair.  Example of polyester: polyester Mat and polyester rope. 2) We can buy products with less plastic packaging. It is often blended with wool to increase the strength. Additionally, synthetic clothing may melt and meld to the wearer, causing more damage than the flames alone. e. ______ shrinks if burnt and forms a black bead a long with sooty flame.Â, Question: Fill in the blanks :-  Answer: Teflon The non stick coating on pans and other cooking utensils is made from ______? 2) Because of its water-resistant properties, it is used to make jackets and garments that are used in wet and damp environments. Now I understand why my mother never wears polyester clothes while working in the kitchen. The lesson also covers Plastic- Its types and its advantages and disadvantages. Question: Fill in the blanks :- a. b.          (a) Wool                                 (b) Nylon The fibres are then spun into yarns and woven into clothes. That is why plastic buckets are used to store water and plastic glasses are used to drink water. They are non-corrosive, therefore we can store chemicals in them safely. Fabrics are sold by names like polycot, polywool, terrycot etc. True or false? There are different types of clothes, some of which have shiny appearance; some of them have different textures. (d) polyester. It means that they can be used for a longer period of time. The ignition temperature of synthetic garments is low, so Synthetic fibres may melt on heating. Cold drink glass is also made up of plastic. 2) It is light and wrinkle resistant. Name one thermosetting plastic which is a good insulator and is used to make plugs and switches. All plastics have one common property−what is it? 13. This PET is used in the manufacturing of pet bottles like cold drink, water bottles. (a) bakelite Properties: Question: What is the name of plastic that is used in making non stick pans? Perspex is a thermoplastic. It is very durable, resistant to chemicals. Answers: Question: Fill in the blanks :-  Log in. All plastics are made of long chain molecules called __________. But clay is not a polymer because polymers are made up of monomer units while clay is not made up of monomer units. (c) Synthetic fibres stick to the body. For example: Viscose comes from pine trees. They are used for making toys, car grills etc. 3.6 Plastics and the Environment When we go to the market, we get usually things wrapped in plastic or packed in polythene bags. Water increases the ignition temperature of wet leaves. 1) We can support recycling schemes. Answer: Polyester is actually made by repeating the units of a chemical called ester. Examples of natural fibres: The following three steps can be taken to reduce the danger that plastics pose to the environment:          (a) Toys                                 (b) Cooker handles,          (c) Carry bags                       (d) Plastic chair, 11. 13.           (c) Acrylic                               (d) Polyester, 02. This is followed by the regeneration of solidified synthetic fibres by passing them through spinnerets.

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