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Modern Material Science And Engineering 2

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Conformation in which the largest substituents are offset by 180






2. Arrangement of the largest substituents where the substituets are offset by 120






3. Relative configuration of adjecent asymmetric carbons






4. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern






5. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit






6. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly






7. Coloring agents that do not dissolve into the polymer






8. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds






9. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light






10. Polymer made up of two of more differenet monomers covalently bonded together






11. Term used to represent the average molecular weight of a sample containing a wide range of polymer chain lengths. this term is used to avoid confusion between the number average and the weight molecular average weight






12. Polymers that contain amide (- N-) groups in the chain






13. Porcess of breaking large organic hydrocarbons into smaller molecules






14. Part of the polymer processing apparatus through which the polymer is pushed - causing the polymer to form a simple shape - such as a rod or tube






15. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber






16. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains






17. One method of expressing the molecular weight of sample of polymers with averaging based on weight; this method is more useful when large molecules in the sample dominate the behavior






18. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)






19. Softening agents






20. Low- molecular- weight building blocks repeated in the polymer chain






21. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer






22. Formation of a polymer that occurs when two potentially reactive end groups on a polymer react to form a new covalent bond between the polymer chain. this reaction also forms a byproduct - which is typically water






23. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets






24. Covalent bonding of the polymer backbone and side groups






25. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed






26. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties






27. Smallest repeating unit in a polymer. aka repeat unit






28. Number of bonds a molecule has formed






29. Specific arrangements of atoms that cause organic compounds to behave in predictable ways






30. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret






31. First step in the process of polymerization - during which a free radical is formed






32. Second- order thermodynamic transition in which the onset of large scale chain mobility occures in polymers. Bellow Tg the polymer is glasslike and brittle. above Tg the polymer becomes rubbery and flexible






33. Form of the molecular weight of a sample of polymer chains determined by dividing the mass of the specimen by total number of mols present; always less than weight average molecular weight; all molecules regardless of size correlate well with Mn






34. Primary raw material for most polymers






35. Formation of a plymer that occurs when two potentially reactive end groups on a polymer react to form a new covalent bond between the polymer chains. this reaction also forms a biproduct - usually water






36. Long chain polymers that contain at least 85% of an ester of a substituted aromatic carboxylic acid. these fibers are strong and can dyed or made transpared






37. Pigments or dyes that change the way light is absorbed or reflected by a polymer






38. Atoms attached to the polymer backbone.






39. Broad category of polymers that includes polymers containing urethane linkages






40. Part of the extrusion apparatus that contains a heated screw which is used to melt the polymer and the polymer forward into the next chamber






41. Polymers comprised of two or more different monomers that attach to the chain in long runs of one type of monomer - followed by another monomer AAAAAAAAAAAAABBBBBBBBBBBBBBBBBBAAAAAAAA






42. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings






43. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process






44. One type of polymer that contains at least 85% of polyacrylonitrile PAN






45. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain






46. Is not asymetric and cannot have multiple configurations






47. Molecule containing a highly reactive unpaired electron






48. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.






49. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed






50. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color