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






2. Molecule containing a highly reactive unpaired electron






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. Relative configuration of adjecent asymmetric carbons






5. Softening agents






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






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






8. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer






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






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






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






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






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






14. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants






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






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






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






19. Number of bonds a molecule has formed






20. 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






21. Configuration of a substituent in a polymer - in which the substituent is located on the same side of the polymer chain in all repeating units






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






23. Coloring agents that do not dissolve into the polymer






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






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






26. 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






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






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






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






30. Primary raw material for most polymers






31. 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






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






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






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






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. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion






37. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






41. 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






42. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups






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






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






45. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.






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






47. Polymer that is made up a single repeat unit






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






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






50. 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