Test your basic knowledge |

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. Molecule containing a highly reactive unpaired electron






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






3. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property






4. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel






5. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants






6. Number of bonds a molecule has formed






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






8. 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






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






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






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






12. Conformation that occurs when the largest substituent in a molecule are offset by 60






13. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret






14. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties






15. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings






16. 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






17. Simple polymeric material produced as pellets in large quantities






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






19. Process used to make thermoset fibers by performing the polymerization reacting in a solbent as the material flows through a spinneret and into a quenching bath






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






21. Is not asymetric and cannot have multiple configurations






22. Two or more polymers mechanically mixed together but without covalent bonding between them






23. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...






24. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit






25. Covalently bonded chains of molecules with small monomer units repeated from end to end






26. An acid and an alcohol






27. Softening agents






28. 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






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






30. Polymer that is made up a single repeat unit






31. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air






32. 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






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






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






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






36. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability






37. One of the two different types of termination in the polymerization process. during this type of termination - the free radicals from two different polymer chains join to end the propogation process






38. Additives whose primary purpose is to reduce the final cost of the product






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






40. Double bounded organic molecule used to begin addition polymerization






41. Number of repeat/structural units in a polymer chain






42. 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






43. Additives that cause swelling - which allows the polymer chains to slide past one another more easily - making the polymer softer and more pliable. also used to decrease the viscosity of cement paste to make it easier to flow






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






45. 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






46. Process of pushing polymers through a spinneret and winding the solidified fibers onto a tow - which imposes a shear stress on the fibers upstream as they emerge from the spinneret






47. Relative configuration of adjecent asymmetric carbons






48. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance






49. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals






50. Conformation in which the largest substituents are offset by 180