bakelite and melamine are the example of

21. Question 7: Explain why the following are made of thermosetting plastics. Answer: 1. searches to solve its rigidity problem. Today, formica and medium density fiberboard (MDF) are still made by mixing bakelite with paper pulp or … 10. The result is a hard plastic material. It was the first truly synthetic plastic and was developed and patented by Leo Baekeland in 1907. Bakelite jewelry became immensely popular in the 1920s as an affordable and attractive replacement for other materials. Answer: (d) Bakelite. 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. Check the below NCERT MCQ Questions for Class 12 Chemistry Chapter 15 Polymers with Answers Pdf free download. Bakelite and melamine are the examples of thermosetting plastics. True 9. Bakelite is the first synthetic plastic and is known as a “material of thousand uses” due to its versatile applications. Polythene and PVC are some of the examples of thermoplastics. Bakelite is used for making electrical switches whereas melamine is used for floor tiles. Melamine formaldehyde (MF) resins MF resins have similar properties to UF resins, but they are tougher and more thermally stable and chemically resistant. Q. Bakelite is a condensation polymer that requires two monomers - phenol and formaldehyde. Bakelite definition: 1. a brand name for a type of hard plastic used especially in the past: 2. a brand name for a type…. Thermosetting polymers : These are semifluid substances with low molecular masses which when heated in a mould, undergo change in chemical composition to give a hard, infusible and insoluble mass. Preview this quiz on Quizizz. Example: Bakelite, melamine, etc. Bakelite and melamine are examples of thermosetting plastic. Thermosetting plastic: Plastics which do not get deformed or softened on heating when mold once, are called thermosetting plastics. Look for models … Bakelite feels heavier when compared to some other types of plastics, like celluloid as one example. 3. Melamine is a compound used in some plastic products, such as dishes, utensils, and more. 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 and melamine are thermoplastics. Write two important properties of bakelite. Consider the weight of a piece of plastic jewelry. Ans. Design and technology: Pupils can revise or learn about thermosetting plastics including; Epoxy resin, Melamine formaldehyde, Polyester resin, Urea formaldehyde and Bakelite, etc. Pupils can then try the ‘quiz time’ questions to test their thermosetting plastic knowledge. MCQ Questions for Class 12 Chemistry with Answers were prepared based on the latest exam pattern. Candidates can download NCERT Exemplar Class 12 Chemistry Chapter 15 from this page. It came in several colors, including translucent and marbled shades by the 1950s. Question 13. Bakelite is a poor conductor of electricity. (a) PVC (b) Polythene (c) PET (d) Bakelite. True 11. True 7. Identify the type of plastic that can best be used to make electrical switches. It resists fire and can tolerate heat better than other plastics. Bakelite is a thermosetting phenol formaldehyde resin, formed from a condensation reaction of phenol with formaldehyde. False 6. Bakelite is used for making electrical switches and switchboards because it is a poor conductor of heat and electricity. Bakelite is an item a jewelry collector should keep an eye out for considering how prices have risen over the last few decades. 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. (ii) It is heat resistant. False 2. J. Bentley, in Paint and Surface Coatings (Second Edition), 1999. Example : Polyethene, Polyvinyl chloride (PVC) etc. Synthetic fibres are moth and insect resistant. 12. Bakelite is a thermosetting plastic, it cannot be molded again whereas Melamine, being a thermoplastic, can be molded any number of times adn reshaped. 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. Write some uses of Bakelite. It is also heat resistant and used for making electrical switches, handles of various utensils, etc. Learn more. (i) It is a poor conductor of electricity. If plastics are burnt, they evolve oxygen gas. In the first half of the 20th century they were made into very important plastics such as Bakelite and Beetleware.… False 3. 2. True 5. True 4. Students can Download Science Chapter 3 Polymer Chemistry Questions and Answers, Notes Pdf, Samacheer Kalvi 7th Science Book Solutions Guide Pdf helps you to revise the complete Tamilnadu State Board New Syllabus and score more marks in your examinations. 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. Answer: Thermosetting – bakelite, melamine Thermoplastics – combs, toys. Example : Bakelite, Melamine etc. what  are the wide range of synthetic or semi-synthetic organic compounds that are malleable and so can be molded into solid objects D. Bakelite is a thermoplastic whereas melamine is a thermosetting plastic. Answer: Melamine is a versatile material. False 8. These cannot be re-melted. Answer. For example, melamine has an annual replacement rate of around 10 to 20%, whereas china has a replacement rate between 50 and 150%. Identify the name of the polymer. You will often notice the heavier feel of Bakelite. (b) Melamine (c) PET (d) Polyester. False 10. Video Explanation. (a) Saucepan handles (b) Electric plugs/switches/plug boards. Answer: (b) Melamine. Melamine is resistant to fire and is hence used for making utensils. See more. 20. It can be explained as follows : both the two plastics are made up of long chain molecules called polumers. 12. Q. We have provided Polymers Class 12 Chemistry MCQs Questions with Answers to help students understand the concept very well. Jammu & Kashmir has banned the use of plastic bags. C. Bakelite and melamine both are thermoplastics. The classic example is Bakelite, the phenol/formaldehyde-based resin invented by the Belgian chemist Baekeland in the early 20th century. Classify the following into thermosetting and thermoplastics-combs, bakelite, melamine, toys. Answer: Plastics are non-reactive, so they can be used for storing chemicals. 54) Thermopalstics can be softened by heat but thermosetting plastics cannot be softened by heat. Examples: PVC and Polythene are used for manufacturing combs, toys, car grills and various type of containers. In 1927 the Bakelite patent expired. 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. There are several variables in the method of polymerization, depending on the properties desired. The formation process of these two types of plastics also differs. Hold another type of plastic you have identified in one hand, and a piece you know to be Bakelite of approximately the same size in the other. For example, glycerol [5], isocyanate [6] as well as substituted melamine [7] had been added into MF resin to improve its flexibility. Ans.Bakelite and melamine. 15. >urea-formaldehyde resin, and melamine-formaldehyde resin—are widely used as adhesives in plywood and other structural wood products. Modern non-stick cookware and the flat end of an electric iron has a coating of a polymer. 11. Key Difference – Bakelite vs Plastic Plastic and Bakelite are both organic polymers, having a very large molecular weight though there exists a difference between the two based on their properties and usage. 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. 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