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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. Is not asymetric and cannot have multiple configurations






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






3. 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






4. Double bounded organic molecule used to begin addition polymerization






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






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






7. Number of bonds a molecule has formed






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






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






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






11. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group






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






13. Softening agents






14. Relative configuration of adjecent asymmetric carbons






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






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






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






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






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






20. 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






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






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






23. Carbon atom capable of multiple configurations due to four different substituents






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






25. Porcess of breaking large organic hydrocarbons into smaller molecules






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






27. Coloring agents that do not dissolve into the polymer






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






29. 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






30. Formation of side chains along the backbone; presence of branches disrupts the interactions beween adjacent chains; lowering the tensile strength - melting point - stiffness - crystallinity - and density






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






32. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end






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






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






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






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. 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






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






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






40. 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






41. 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






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






43. 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






44. 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






45. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group






46. An acid and an alcohol






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






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






49. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination






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