It is a thermosetting polymer and Bakelite has high strength meaning it basically retains its form even after extensive molding. Some phenols are suspected carcinogen, should not inhale its dust or vapor, wear gloves and avoid contact. /Filter /FlateDecode /F2 15 0 R Phenolic resins are also extensively used as adhesives and binding agents. (a) Terylene (b) Bakelite (c) Melamine (d) Nylon-6,6. 4.Complete the following two synthesis reactions by filling in the missing products: a.2Al + 3Br 2! Very smooth molding can be obtained from this polymer. >> /F3 18 0 R stream /Width 18 The extraordinary range of properties accessible in polymeric materials, has led to polymers playing a useful and indispensible role in our lives. Bakelite is a polymer made up of the monomers phenol and formaldehyde. In one of them, ammonium phosphate [(NH4)2.HPO4] and Ca(OH)2 were starting materials (equation 2). /Mask [1 1 ] in Philippines I assume. The word 'synthesis' means to put together. << In our lab, the Phenol-formaldehyde reaction mixture was prepared by mixing 25 g 36-40% formaldehyde + 20 g phenol + 55 mL glacial acetic acid under a fume hood. They are insoluble in organic solvents. endstream They are formed by condensation polymerization They are processed by compression moulding. Play this game to review Chemical Reactions. This project requires some amount of precaution but the outcome is rewarding.A polymer is a macromolecule composed of repeating structural units connected by covalent bonds. (a) Nylon (b) Bakelite (c) Terylene (d) Rubber, Of the following which one is classified as polyester polymer? /Font << The chemical equation for the preparation of Bakelite from formaldehyde is as shown. In a synthesis reaction two substances combine to produce a single product. >> Use uppercase for the first character in the element and lowercase for the second character. As the point of polymerization approached a white precipitate was formed which is insoluble in the concentrated acid. Examples: Fe, Au, Co, Br, C, O, N, F. Ionic charges are not yet supported and will be ignored. The polymer chains are linked by strong chemical bonds viz covalent bonds. endstream The chemical equation for the synthesis of aspirin is C7H6O3 + C4H6O3 –> C9H8O4 +C2H4O2, which is a reaction of salicylic acid with acetic anhydride in the presence of phosphoric acid. Bakelite is a thermosetting plastic. /Img2 8 0 R %���� In our lab, the Phenol-formaldehyde reaction mixture was prepared by mixing 25 g 36-40% formaldehyde + 20 g phenol + 55 mL glacial acetic acid under a fume hood. >> /Mask [1 1 ] /Length 37 Phenol:- Most phenols are harmful if inhaled, ingested or absorbed through skin. 2 Mg (s) + O_"2" (g) -> 2 MgO First, we need to identify the type of bond and reaction. << b. Bakelite is the commercial name for the polymer obtained by the polymerization of phenol and formaldehyde. Refuxing a thermosettingresin does not seem pertinent here. 6 0 obj Al(s) 4. /Resources << Increasing the surface area increases the rate of reaction. The general chemical equation for a synthesis reaction is A + B   AB. 10 0 obj 2. N 2 O 5 + H 2 O ---> 2HNO 3 Preview this quiz on Quizizz. stream They must support if not reiterate the theoretical aspects of rote classroom learning. Chemical Concept Demonstrated: Thermoset plastics. Performance & security by Cloudflare, Please complete the security check to access. Their expansion is only marginal due to heat. 1. K(s) 3. We cannot deny the presence of polymers in our lives. 2Mg + O2 → 2MgO. The prep for sake of safety should be conducted in a Lab. Phenol is made to react with formaldehyde. Observations: The polymer expands out of the beaker, along with a … Preparation of polymers, namely Bakelite is a simple laboratory procedure. From synthetic plastics and elastomers on the one hand to natural biopolymers such as DNA and proteins that are essential for life, all polymers are formed from monomers.The small organic molecules which polymerize to form the polymer are called monomers. x^�������`�b`pDFA��J���� �U� Polymerisation is the process of converting small organic molecules into high molecular weight molecules either by addition or by the condensation reaction. Mary, Bakelite is a thermosetting resin -therefore after heating it is set it will not change. Owing to its low electrical conductivity, bakelite is resistant to electric current. /Height 18 Ireno Alcala from Bicol, Philippines on October 07, 2012: What a successful experiment you have here. When the phenol is taken in excess and the reaction medium is made acidic, the product of the condensation reaction obtained is acidic. 4 0 obj If the jar is observed crystals of sodium chloride salt are seen which have formed on the sides of the glass. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. CBSE Previous Year Question Papers Class 10, CBSE Previous Year Question Papers Class 12, NCERT Solutions Class 11 Business Studies, NCERT Solutions Class 12 Business Studies, NCERT Solutions Class 12 Accountancy Part 1, NCERT Solutions Class 12 Accountancy Part 2, NCERT Solutions For Class 6 Social Science, NCERT Solutions for Class 7 Social Science, NCERT Solutions for Class 8 Social Science, NCERT Solutions For Class 9 Social Science, NCERT Solutions For Class 9 Maths Chapter 1, NCERT Solutions For Class 9 Maths Chapter 2, NCERT Solutions For Class 9 Maths Chapter 3, NCERT Solutions For Class 9 Maths Chapter 4, NCERT Solutions For Class 9 Maths Chapter 5, NCERT Solutions For Class 9 Maths Chapter 6, NCERT Solutions For Class 9 Maths Chapter 7, NCERT Solutions For Class 9 Maths Chapter 8, NCERT Solutions For Class 9 Maths Chapter 9, NCERT Solutions For Class 9 Maths Chapter 10, NCERT Solutions For Class 9 Maths Chapter 11, NCERT Solutions For Class 9 Maths Chapter 12, NCERT Solutions For Class 9 Maths Chapter 13, NCERT Solutions For Class 9 Maths Chapter 14, NCERT Solutions For Class 9 Maths Chapter 15, NCERT Solutions for Class 9 Science Chapter 1, NCERT Solutions for Class 9 Science Chapter 2, NCERT Solutions for Class 9 Science Chapter 3, NCERT Solutions for Class 9 Science Chapter 4, NCERT Solutions for Class 9 Science Chapter 5, NCERT Solutions for Class 9 Science Chapter 6, NCERT Solutions for Class 9 Science Chapter 7, NCERT Solutions for Class 9 Science Chapter 8, NCERT Solutions for Class 9 Science Chapter 9, NCERT Solutions for Class 9 Science Chapter 10, NCERT Solutions for Class 9 Science Chapter 12, NCERT Solutions for Class 9 Science Chapter 11, NCERT Solutions for Class 9 Science Chapter 13, NCERT Solutions for Class 9 Science Chapter 14, NCERT Solutions for Class 9 Science Chapter 15, NCERT Solutions for Class 10 Social Science, NCERT Solutions for Class 10 Maths Chapter 1, NCERT Solutions for Class 10 Maths Chapter 2, NCERT Solutions for Class 10 Maths Chapter 3, NCERT Solutions for Class 10 Maths Chapter 4, NCERT Solutions for Class 10 Maths Chapter 5, NCERT Solutions for Class 10 Maths Chapter 6, NCERT Solutions for Class 10 Maths Chapter 7, NCERT Solutions for Class 10 Maths Chapter 8, NCERT Solutions for Class 10 Maths Chapter 9, NCERT Solutions for Class 10 Maths Chapter 10, NCERT Solutions for Class 10 Maths Chapter 11, NCERT Solutions for Class 10 Maths Chapter 12, NCERT Solutions for Class 10 Maths Chapter 13, NCERT Solutions for Class 10 Maths Chapter 14, NCERT Solutions for Class 10 Maths Chapter 15, NCERT Solutions for Class 10 Science Chapter 1, NCERT Solutions for Class 10 Science Chapter 2, NCERT Solutions for Class 10 Science Chapter 3, NCERT Solutions for Class 10 Science Chapter 4, NCERT Solutions for Class 10 Science Chapter 5, NCERT Solutions for Class 10 Science Chapter 6, NCERT Solutions for Class 10 Science Chapter 7, NCERT Solutions for Class 10 Science Chapter 8, NCERT Solutions for Class 10 Science Chapter 9, NCERT Solutions for Class 10 Science Chapter 10, NCERT Solutions for Class 10 Science Chapter 11, NCERT Solutions for Class 10 Science Chapter 12, NCERT Solutions for Class 10 Science Chapter 13, NCERT Solutions for Class 10 Science Chapter 14, NCERT Solutions for Class 10 Science Chapter 15, NCERT Solutions for Class 10 Science Chapter 16, Important Questions For Class 11 Chemistry, Important Questions For Class 12 Chemistry, Difference Between Baking Soda And Baking Powder, CBSE Previous Year Question Papers Class 10 Science, CBSE Previous Year Question Papers Class 12 Physics, CBSE Previous Year Question Papers Class 12 Chemistry, CBSE Previous Year Question Papers Class 12 Biology, ICSE Previous Year Question Papers Class 10 Physics, ICSE Previous Year Question Papers Class 10 Chemistry, ICSE Previous Year Question Papers Class 10 Maths, ISC Previous Year Question Papers Class 12 Physics, ISC Previous Year Question Papers Class 12 Chemistry, ISC Previous Year Question Papers Class 12 Biology.