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- 1. What is polymer? a. A large molecule made by twisted chains. b. A small molecule made of one atom. c. A large molecule made by human. d. A large molecule made by monomers.15. Network polymer structure is. O A. Branching. B. Liner. C. Cross-link. 16. Strong bonding in organic chemistry is. O A. Covalent bonding. OB. Hydrogen bonding. C. Van der Waals. Is are cured into permanent shape is Cannot be re- 17. melted. A. Thermoplastics B. Thermosetting PlasticsThe 'world's Ethics and quality-assurance committee' makes sure that liquor-alcohol should be made in the industry from what raw material? a. plants b. petroleum c. natural laboratory d. animals *Choose only one answer and explain.
- One of the critical properties of polymers is elasticity. The ability of many polymeric materials to be stressed and deformed but return to their original shape is a characteristic that is often valuable to engineers. Suggest a reason why polymer molecules are mostly elastic. a. made of ionic solid b. made of metallic solid c. made of crystalline solid d. made of amorphous solid5. The reactions in which polymers are produced are called A. Decomposition B. Polymerization reactions. C. Single displacement D. SynthesisI. a. What are polymers and how are they found from alkene monomer? b. Discuss briefly plastic recycling. What kind of plastics can be recycled?
- . A section of the structure of a polymer is shown below. H. 1 1 I I - C-C-C-C-C-C - H HH CI H CI CI a. How many repeat units are shown in the structure? b.Draw the structure of the monomer c. State its molecular formula.Are polymer today becoming more sophisticated in structure? why or Why not?8. The conditions at which the rate of evaporation and condensation are equal is called? a. reactions b. equilibrium c. synthesis d. complexation
- London forces are forces of attraction between what molecules. a. polar b. nonpolar c. slightly polarنقطة واحدة نقطة واحدة نقطة واحدة = ||| १:०१ Most monomers are organic .12 materials, atoms are joined in A. Hydrogen bonding. B. Covalent bonding. The development of modern .13 plastics started in 1920s using raw material extracted from coal and petroleum is products A. Phenolic resin. B. Polyethene. C. PVC. .Polymer structure are involve .14 A. One structure. B. Three structure. C. Two structure. ^ O !a. Explain the differences between a pendant and stiffening groups in polymers.b. What is the effect of stiffening and softening groups on the properties ofpolymers? Explain by using suitable examples.