Plastic Applications. PVC (polyvinylchloride) -a cheaper plastic used for window frames and pipes. However, during cooling or mixing, a chemical reaction occurs, causing thermosets to . PVC is polyvinyl chloride and it is a type of vinyl polymer. Question: True Or False. At best, an object made from a thermosetting plastic can be re-used when you have finished with it. Like synthetic fibres, plastic is also a ........... Toys, carry bags, plastic bowls, electric wire. 1 true 2 true 3 false ‐The plastic is solid. Can you write the major difference between these two types of plastics? Answer: Nylon. True. (C) PVC. True b. Question 5. Play this game to review Chemistry. See the answer. They are classified either as thermosetting polymers or thermoplastic polymers. Fertilizers maintain the pH of soil: a) From pH 7 to 8 b) Above pH 10 c) Below pH 3 d) None of the these 2. Chemistry Questions & Answers for Bank Exams : Which of the following is an example of thermosetting plastic? Answer: Polymers are compounds that are made up of … b. Many small units combine to form a large single unit called a ……... . Question 7. PE and PVC may also be cross-linked making them thermosetting types. State whether the statements given below are True or False: All fibres are made up of very large units which in turn are made up of many small units. These are used for manufacturing toys, combs, cargrills and various types of containers. True. 3. b. (a) Melamine (b) Polythene – (c) PVC (d) Nylon Answer. a. Epoxy resin. It can be dyed in a wide variety of colors. Examples are bakelite and melamine. ? Thermosetting plastics, also called . T/F- PVC fittings are made by the extrusion process in which plastic resins are heated, softened, and forced through a circular die, which forms the cylindrical pipe shape. They can be melted again and again. Thermosetting plastic once set do not soften on heating. Nylon fibres are strong elastic and light, lusturus and easy to wash. Name a synthetic fibre which is polyamide. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. False. FALSE; HDPE is a tough plastic used for making toys. 2. If subjected to extremely high temperatures, the material may unwantedly soften, deform, and … Rayon is mixed with cotton to make bedsheets or mixed with wool to make carpets. Acrylic is an artificial wool. This makes thermosetting plastics ideal for producing heat resistant products such as insulation parts, car parts, etc. False. For Any Sample Of Plastic, It Is Generally Too Costly To Count The Number Of Repeating Units On Each Of The Polymer Chains. B. Polythene. its fibres can also be woven like those of natural fibres. Also, bakelite is a poor conductor of electricity, hence, it protects us from getting electric shocks. ... State whether the following statements are True or False: Question 1. All the synthetic fibres are prepared using raw materials of petroleum origin called.............. . Assertion: Bakelite is a thermosetting plastic. Question 1. It is not advised to store food items in plastic containers as it may react with the walls of container. Heat is not necessarily to be applied externally. Visually speaking, thermoplastic chains are clumped together like a ball of tangled yarn. Question 4. Polyvinyl chloride (PVC) : pipes, cable insulation, packaging, flooring, toys; Polyethylene : bottles, cans, packaging materials; Thermosetting polymers (Thermosets) TS cannot tolerate repeated heating cycles as thermoplastics can. B. Thermoplastics and thermosetting plastics . 3) Examples are polythene and polyvinyl chloride. Instead, thermoplastic chains are held together by van der waal forces, weak attractions between molecules. (D) examples of heavy fibers. FALSE; Epoxy resin is a thermoplastic? Fill in the blanks. Can you write the major difference between these two types of plastics? Thermoplastics are 100% recyclable. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Thermosetting Plastics:There are some plastics which when … False. Answer: Nylon. 1M 5. Explain why the following are made of thermosetting plastics: (a) Saucepan handles (b) Electric plugs/switches/plug boards 6. A. PVC. Plastics are produced by condensation and addition polymerization reactions. Answer: (a) melamine Melamine is a thermosetting plastic. Initially, the polymer is a liquid or soft solid. Fill in the blanks. In ideal situations, thermoplastics can be repeatedly melted and remolded into new products. 3. Bloomberg planning to double plastic, all recycling in New York City. FALSE; PVC is a thermoplastic. Decide whether the following statements about thermosetting plastics are true or false. Thermoplasticis a plastic which gets deformed easily on heating and can be bent easily e.g., Polythene and PVC. Plastics are divided into two groups depending on how it reacts to heat. Thermoplastics can be repeatedly softened by heating and hardened by cooling.Thermosetting plastics, however, harden permanently after being heated once. True b. (a) Melamine is a thermosetting plastic which when moulded once, cannot be softened by heating. Recyclability of PVC waste can be achieved mechanically without modifications or use of new plasticizer since the separation of other mixed plastics is possible through triboelectrostatic technology [50, 52]. It is used with metals and thermosetting plastics. Examples of thermoplastics include polythene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), nylons, etc. The main thermosetting plastics are epoxy resin, melamine formaldehyde, polyester resin and urea formaldehyde. Nylon was made in 1931. Features & Benefits. TRUE ? Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. Thermosetting Plastics: ... Q. Justify each choice. Thermoplastic polymers can be heated and remolded for an unlimited amount of time. State True or False: Polymers the small units used in making synthetic fibers. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. 7. Separate polymers are joined in order to form a huge polymer. False. What is the difference between thermoplastic and thermosetting plastics? To play this quiz, please finish editing it. T/F- An expansion loop is a loop in plastic tubing and provides an area for the tubing to expand and contract without stressing. Examples – Polythene and polyvinyl chloride(PVC) Thermosetting PlasticThe plastic which getsmoulded once, cannot besoftened on heating is called thermosetting plastic. 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