bakelite and melamine are the example of

15. Bakelite jewelry became immensely popular in the 1920s as an affordable and attractive replacement for other materials. MF resins are used for higher end applications like laminates for countertops and cabinets and surface coatings for automobiles that require a binder with good cosmetic characteristics. For example: - Bakelite and Melamine. False 8. False 10. Answer: Plastics are non-reactive, so they can be used for storing chemicals. The result is a hard plastic material. T h e r m o p l a s t i c s: These are the plastics which get deformed easily on heating and can be bent easily. The market value is extremely high, due to the retro feel and limited quantities of certain products. 13. Why are the chemicals in the laboratory stored in plastic containers ? There are several variables in the method of polymerization, depending on the properties desired. True 4. Tamilnadu Samacheer Kalvi 7th Science Solutions Term 3 Chapter 3 Polymer Chemistry 54) Thermopalstics can be softened by heat but thermosetting plastics cannot be softened by heat. what  are the wide range of synthetic or semi-synthetic organic compounds that are malleable and so can be molded into solid objects True 7. Video Explanation. Thermosetting plastic: Plastics which do not get deformed or softened on heating when mold once, are called thermosetting plastics. 11. Modern non-stick cookware and the flat end of an electric iron has a coating of a polymer. Identify the name of the polymer. Jammu & Kashmir has banned the use of plastic bags. Compared to bakelite, melamine is lighter and more elastic and therefore can be used with thinner objects, for example, in games and models, as well as for creating bijoux and accessories for clothes. Classify the following into thermosetting and thermoplastics-combs, bakelite, melamine, toys. Bakelite and melamine are thermoplastics. Q. Bakelite definition, a brand name for any of a series of thermosetting plastics prepared by heating phenol or cresol with formaldehyde and ammonia under pressure: used for radio cabinets, telephone receivers, electric insulators, and molded plastic ware. Design and technology: Pupils can revise or learn about thermosetting plastics including; Epoxy resin, Melamine formaldehyde, Polyester resin, Urea formaldehyde and Bakelite, etc. True 5. Write some uses of Bakelite. Molded Bakelite forms in a condensation reaction of phenol and formaldehyde, with wood flour or asbestos fiber as a filler, under high pressure and heat in a time frame of a few minutes of curing. Q. Check the below NCERT MCQ Questions for Class 12 Chemistry Chapter 15 Polymers with Answers Pdf free download. Answered By J. Bentley, in Paint and Surface Coatings (Second Edition), 1999. B. Bakelite and melamine both are thermosetting plastics. Bakelite definition: 1. a brand name for a type of hard plastic used especially in the past: 2. a brand name for a type…. If plastics are burnt, they evolve oxygen gas. MCQ Questions for Class 12 Chemistry with Answers were prepared based on the latest exam pattern. Bakelite is used for making electrical switches and switchboards because it is a poor conductor of heat and electricity. Melamine is resistant to fire and is hence used for making utensils. In 1927 the Bakelite patent expired. Question 13. Example : Polyethene, Polyvinyl chloride (PVC) etc. Q. Synthetic fibres are moth and insect resistant. searches to solve its rigidity problem. Preview this quiz on Quizizz. Identify the type of plastic that can best be used to make electrical switches. It was made from a mixture of phenol (carbolic acid) and formaldehyde. Two example of thermosetting plastics are : Bekalite and melamine. It is also heat resistant and used for making electrical switches, handles of various utensils, etc. 2. Bakelite and melamine are the examples of thermosetting plastics. Like cyanamide, it contains 67% nitrogen by mass, and its derivatives have fire retardant properties due to its release of nitrogen gas when burned or charred. Bakelite is the first synthetic plastic and is known as a “material of thousand uses” due to its versatile applications. Hence, option C is correct. Example: Bakelite, melamine, etc. These cannot be re-melted. 14. It can be explained as follows : both the two plastics are made up of long chain molecules called polumers. Answer. Consider the weight of a piece of plastic jewelry. Candidates can download NCERT Exemplar Class 12 Chemistry Chapter 15 from this page. Bakelite feels heavier when compared to some other types of plastics, like celluloid as one example. Bakelite's molding process had a number of advantages. 12. Melamine / ˈ m ɛ l ə m iː n / is an organic compound with the formula C 3 H 6 N 6.This white solid is a trimer of cyanamide, with a 1,3,5-triazine skeleton. A. Melamine is a thermoplastic whereas bakelite is a thermosetting plastic. Examples: PVC and Polythene are used for manufacturing combs, toys, car grills and various type of containers. 3. Syntheses of a number of polymers are based on condensation of methanal with amino compounds by mechanisms at least formally analogous to those involved in the preparation of Bakelite resins. It resists fire and can tolerate heat better than other plastics. (b) Melamine (c) PET (d) Polyester. Question 7: Explain why the following are made of thermosetting plastics. The classic example is Bakelite, the phenol/formaldehyde-based resin invented by the Belgian chemist Baekeland in the early 20th century. Learn more. Ans. Thermoplastic: Plastics that can be deformed easily upon heating and can be bent easily. D. Bakelite is a thermoplastic whereas melamine is a thermosetting plastic. 33. For example, melamine has an annual replacement rate of around 10 to 20%, whereas china has a replacement rate between 50 and 150%. 11. (ii) It is heat resistant. Example : Bakelite, Melamine etc. In the first half of the 20th century they were made into very important plastics such as Bakelite and Beetleware.… The exemplar has been provided by the National Council of Educational Research & Training (NCERT) and the candidates can check it from below for free of cost. False 6. You will often notice the heavier feel of Bakelite. Bakelite is a man-made (synthetic) material while Melamine occurs naturally (is organic). 10. Plastics are corrosive in nature. (i) It is a poor conductor of electricity. As we all know, emulsifier can reduce the interfacial tension and increase the contact area between foaming agent and MF resin which is benefit to foaming. Write two important properties of bakelite. Question 25. In the growing consumer market of the 1930s and after, Bakelite faced competition from other thermosetting resins such as urea formaldehyde and melamine formaldehyde and from new thermoplastic resins such as cellulose acetate, polyvinyl chloride, polymethyl methacrylate, and polystyrene. 12. False 2. Bakelite is used for making electrical switches whereas melamine is used for floor tiles. Answer: (d) Bakelite. The formation process of these two types of plastics also differs. Authentic bakelite jewelry can sell for thousands of dollars, so it's important you learn how to tell the difference between genuine and imposter plastic jewelry. Bakelite is a thermosetting plastic, it cannot be molded again whereas Melamine, being a thermoplastic, can be molded any number of times adn reshaped. It was the first truly synthetic plastic and was developed and patented by Leo Baekeland in 1907. Look for models … Answer: Thermosetting – bakelite, melamine Thermoplastics – combs, toys. Bakelite is a thermosetting phenol formaldehyde resin, formed from a condensation reaction of phenol with formaldehyde. (a) PVC (b) Polythene (c) PET (d) Bakelite. Today, formica and medium density fiberboard (MDF) are still made by mixing bakelite with paper pulp or … (a) Saucepan handles (b) Electric plugs/switches/plug boards. Ans.Bakelite and melamine. 2.10.4 Uses. Polythene and PVC are some of the examples of thermoplastics. Pupils can then try the ‘quiz time’ questions to test their thermosetting plastic knowledge. Bakelite is a poor conductor of electricity. We'll discuss whether it's safe to use and any risks. Explain the difference between thermoplastics and thermosetting plastics. 20. Melamine is a compound used in some plastic products, such as dishes, utensils, and more. >urea-formaldehyde resin, and melamine-formaldehyde resin—are widely used as adhesives in plywood and other structural wood products. 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