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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. Number of repeat/structural units in a polymer chain






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






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






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






6. Molecule containing a highly reactive unpaired electron






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






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. Softening agents






10. An acid and an alcohol






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






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






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






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






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






16. 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






17. 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






18. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device






19. Covalent bonding of the polymer backbone and side groups






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






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






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






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






24. Primary raw material for most polymers






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






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






27. Atoms attached to the polymer backbone.






28. 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






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






30. Coloring agents that do not dissolve into the polymer






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






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






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






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






35. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads






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






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






38. Porcess of breaking large organic hydrocarbons into smaller molecules






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






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






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






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






43. 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






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






45. Relative configuration of adjecent asymmetric carbons






46. 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






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






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






49. 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






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