Candidates can click on the subject wise link to get the same. It is a chapter which is purely conceptual with a lot of emphasis in theory. Classification based on mode of polymerisation: Class XII Chapter 15 – Polymers Chemistry Question 15.1: Explain the terms polymer and monomer. Terylene is used in the manufacture of a variety of clothes such as terycot, terywool and terysilk as a result of blending with other yerns. Polymers Class 12 2. We have also provided with a List of Polymers and their monomers that are prescribed on the NCERT Book of Class 12. It is manufactured from rubber latex which is a colloidal suspension of rubber in water. Nominations are now open until 31st December. These are also known as macromolecules. Huge List of CBSE Chemistry Projects for Class 12, Chemistry Science Fair Projects Free Download, Models, Experiments, Winning CBSE Chemistry Science Experiments,cool and fun interesting investigatory project for chemistry for Kids and also for Middle school, Elementary School for class 5th Grade,6th,7th,8th,9th 10th,11th, 12th Grade and High School , MSC and College Students. 2. A macromolecule mayor may not contain monomer units, e.g., chlorophyll (C55H72O5N4Mg) is a macromolecule but not a polymer since there are no monomer units present so we can conclude that all polymers are macromolecules while all macromolecules may not be polymers in nature. It is a condensation product of ethylene glycol and terephthalic acid. Polymers class 12 CBSE 1. Chemistry MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. It is a polyester having crosslinks. We have also provided with a List of Polymers and their monomers that are prescribed on the NCERT Book of Class 12. It is used for making rain coats, toys, electrical insulation. is known as polymerisation. Polymers Class 12 CBSE Revision Notes. Polymer formed by polymerisation of chloroprene is neoprene or synthetic rubber. Download CBSE Class 12 Chemistry Polymer Questions Answers pdf, Chemistry revision notes, mind maps, formulas, examination notes, sure shot questions, CBSE Class 12 Chemistry Polymer Questions Answers. Learners at any stage of their preparations will be benefited from the course. A few ‘crosslinks’ are introduced in between the chains, which help the polymer … Chemistry MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. This document is highly rated by Class 12 students and has been viewed 6319 times. The monomer of polystyrene is (a) C 2 H —CH=CH 2 (b) CH 2 =CHCl (c) C 6 H 5 CH=CH 2 (d) CH 2 =CH—CHO. The chapter of Polymers in Chemistry is a great lesson in teaching students about their properties and characteristics. Question 15.1: What are polymers? It is hard and resistant to heat and chemicals. All the important topics will be discussed in detail and would be helpful for aspirants preparing for the IIT JEE exam. Some examples of synthetic polymers include nylon, polypropylene, polyvinyl chloride. Class 12 Chemistry Polymers: Classification of Polymers: Classification of Polymers. Vulcanisatlon is carried out by adding sulphur (3-5%) and zinc oxide to the rubber, and then heating the object at about 110°Cfor about 20-30 minutes. Dimer, trimer and tetramer are the number of structural units present in the polymer. Classifications of polymers • Polymers are made up of large no of macromolecules. Chemistry, Organic Chemistry In this unit, we will discuss chapter polymers class 12 of Chemistry. In the natural rubber, there is no polar substituent. 8. Click to Download It is a copolymer of buta-I, 3-diene and acrylonitrile. Polymer is defined as a chemical substance of a high. In these polymers, the monomers are joined together to form long straight chains of polymer molecules. There are several ways of classification of polymers based on some special considerations. The molecules of the same monomer or different monomers add together on a large scale to form a polymer. It is a copolymer of 3-hydroxybutanoic acid and 3-hydroxypentanoic acid. A copolymer contains multiple units of each monomer in the same polymeric chain. Examples of cross linked polymers are bakelite, glyptal, melamine-formaldehyde polymer etc. Thus, for a student of class 12 to understand topics in the subject it is important that they have a good understanding of the subject. Candidates who are studying in Class 12 can also check Class 12 NCERT Solutions from here. It is a natural polyamide fibre. As polymers are single big size molecules, they are also called  macromolecules. (ii) Branched chain polymers In such polymers, the monomer units are linked to form long chains with some branched chains of different lengths with source. For example, styrene and methacrylate form a copolymer. NCERT Book for Class 12 Chemistry Chapter 15 Polymers is available for reading or download on this page. All the important topics … It is thermoplastic. These are called biopolymers, e.g., polysaccharides, proteins, nucleic acids, etc. which means many units (parts). (i) Linear polymers These are the polymers in which the monomer units are linked to one another to form long linear chains. This document is highly rated by Class 12 students and has been viewed 983 times. 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The topic of this project is "Polymers". As such, it cannot be used very extensively for commercial puposes. Polymers are formed in two general ways. It is the ratio of the mass average molecular mass to the number average molecular mass. which means many units (parts). NCERT Solutions for Class 12 Chemistry Chapter 15 Polymers. Nylon-66 is a linear polymer and has very high tensile strength. Step I Initiation Strong bases act as initiator. It is also chemically inert and more tougher and harder. It is used as a substitute for wool in making commercial fibres as orIon or acrilan. Addition polymers have the same empirical formula as their monomers. Polymer Chemistry Lectureship. Digital NCERT Books Class 12 Chemistry pdf are always handy to use when you do not have access to physical copy. Polymer is defined as a chemical substance of a high molecular mass formed by the combination of a … Natural.rubber is a coiled linear 1, 4-polymer of isoprene. NCERT Solutions For Class 12 Chemistry Chapter 15 Polymers September 25, 2020 by phani Topics and Subtopics in NCERT Solutions for Class 12 Chemistry Chapter 15 Polymers : Distinction Between Chain Growth Polymerisation and Step Growth Polymerisation. The word polymer has a Greek origin. In the polymer chain of natural rubber, the residual double bonds are located between C2 and C3 of the isoprene unit. The reaction involves the formation of methylene bridge at ortho, para or both ortho and para positions. It is used in bristles for brushes and in textile. and protonic acids such as H2SO4, HF, etc. It is determined by osmotic pressure method. The word ‘polymer’ is coined from two Greek words: poly means many and mer means unit or part. ... Class 12th Chemistry – 14 Biomolecules MCQs. To make this chapter easier to study and prepare, you will need the assistance of Class 12 Chemistry … Natural rubber is cis 1,4-polyisoprene. In this chapter, you will study what polymers are and how they are formed. In other words, such polymers are more homogeneous. (a) Elastomers In the biological system, these polymers decompose or hydrolyse in the Presence of different enzymes. Candidates who are ambitious to qualify the Class 12 with good score can check this article for Notes. Classification of the Polymers:- Classification on the basis of repeating structural unit:-. which means many units (parts). • This process of formation of polymers from respective monomers is called polymerisation. To help you with that, below we have provided the Notes of 12 Chemistry for topic Polymers. This means that they are biodegradable. (c) Thermoplastics. The process of heating a mixture of raw rubber and sulphur at 373 K to 415 K is known as vulcanisation of rubber. Polymers Class 12 2. C:\Chemistry-12\Unit-15.pmd 28.02.07 elastomeric polymers, the polymer chains are held together by the weakest intermolecular forces. 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