bakelite and melamine are example of

Thermosetting: Plastics that cannot be softened again by heating once they are moulded. It is used for making electrical switches, handles of various utensils, etc. Answer: Plastics are non-reactive, so they can be used for storing chemicals. The fabric melts and sticks to the body of the person wearing it. After some time, the cloth disappeared and from their plastic got its name. The list is endless if we start counting articles like slippers, furniture and decoration pieces, etc. To mop that solution (a mixture of nitric and sulphuric acid) he took a cloth and after moping he kept it over the stove. Synthetic fibre: There are some fibres which made from chemical substances, and they do not obtain from plant or animal sources. The word, plastic, was derived from the word ‘Plastikos’ meaning ‘to mould’ in Greek. Depending on physical properties, plastics are divided into two types: Thermoplastic and thermosetting. It does test positive for Bakelite but can have a unique look bi-color look about it. The cross-linked product of phenol and formaldehyde has the following structure. They are very rigid, hard, and brittle. d) Silk 10 The coating on modern non- stick cookware and electric iron is of. This is because of their light weight, lower price, good strength and easy handling. For example, Bakelite jewelry is more rare than, say, dishes or cookware. Acrylic blankets are cheap, light in weight, more durable and are available in variety of colours and designs. So, it is quite suitable for making dress material. It is used in electric switches, plugs, handles of pressure cooker and tea kettle, radio and TV cabinets, etc Bakelite, Melamine, etc are some examples of it. Why are the chemicals in the laboratory stored in plastic containers ? Although rayon is obtained from a natural source, wood pulp, yet it is a man-made fibre. Bakelite and Melamine are examples of (a) Thermosetting plastics (b) Silk (c) Nylon (d) Rayon. After reading NCERT Books, you have just to go through these questions to prepare the entire chapter for exams. They are available in a variety of colours. These building blocks are known as monomers, they link together to form long carbon chains called polymers. These polymers are brittle and hard. Bakelite is a man-made (synthetic) material while Melamine occurs naturally (is organic). b) Plastic bag, … Tamilnadu Samacheer Kalvi 7th Science Solutions Term 3 Chapter 3 Polymer Chemistry 8 Bakelite and Melamine are examples of. Your email address will not be published. (adsbygoogle = window.adsbygoogle || []).push({}); Copyright 2020 by Tiwari Academy – A step towards Free Education, NCERT Solutions for Class 8 Science Chapter 3, Class 8 Science Chapter 3 Important Questions. Such as plastic. The market value is extremely high, due to the retro feel and limited quantities of certain products. Stuck At Home? We need not produce resources on large scale which may lead to exploitation of natural resources. Answer. It begins with heating of phenol and formaldehyde in the presence of a catalyst such as hydrochloric acid, zinc chloride, or the base ammonia. It is usually elastic and soft. It remains crisp and is easy to wash. Melamine is a versatile material. And example??? Hence, “manufacturing synthetic fibres is actually helping conservation of forests”. “A lady went to a market to buy a blanket. Answer. Classify the following into thermosetting and thermoplastics-combs, bakelite, melamine, toys. Easily moulded into different shape and size. ii) Buy products without a little plastic packaging. b) Rayon. Sustained heating results in an "insoluble hard gum". Generally, people love to wearing polyester shirts and other dresses. a) Nylon b) Rayon c) Melamine plastic d) Silk. Check the below NCERT MCQ Questions for Class 12 Chemistry Chapter 15 Polymers with Answers Pdf free download. The wool obtained from natural sources is quite expensive, whereas clothes made from acrylic are relatively cheap. Justify the statement. I need All small to small ditails in plastic Therefore, people always prefer to choose plastic instead of using metals. Can you guess why? Question 10 Write 1 characteristics of teflon? Download NCERT Books 2020-21 based on new CBSE Syllabus for session 2020-2021. 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