Sample questions: Multiple Choice

  1. Most vinyl polymers prefer

  2. The common form of polystyrene, as it exists under ordinary conditions, is

  3. A polymer with a few butyl branches on a polyethylene backbone is obtained by copolymerization of ethylene and

  4. If a chromophore has a molar extinction coefficient of 3000 cm2/mmole, the concentration that is most accurately measurable in a cell with a 1 cm light path is

  5. Stray light causes deviations from Beer's law that are most important at:

  6. For which diatomic is infrared absorption the strongest?

  7. Which molecule has the simplest infrared absorption spectrum?

  8. Successive energy levels are equally spaced for

  9. As temperature increases, the frequency of a harmonic oscillator

  10. At the temperature of this room, thermal energy corresponds to the energy of which process?

  11. If ordinary hydrogen, 1H, is replaced by deuterium, 2H, the frequency of the stretching of the C-H bonds

  12. When comparing the infrared spectrum of free and hydrogen bonded O-H, the hydrogen bonded O-H gives a spectrum that is

  13. 10-14 s is a typical time for

  14. When measured for polystyrene in dilute solution at ambient temperature, which spectrum shows the smallest number of easily resolvable bands?

  15. Which spectrum is most often used to determine the tacticity of a vinyl polymer?

  16. The smallest excimer emission for a dilute mixture of poly(vinyl naphthalene) in a transparent poly(methacrylate ester) is obtained when the solublity parameter of the poly(vinyl naphthalene) is

  17. Which polymer has the least likelihood of forming an excimer?

  18. Depolarization of fluorescence in polymers is least likely to be caused by

  19. Of the four techniques listed, the one most often used to study electronic energy migration in aromatic vinyl polymers is

  20. The Forster radius is not directly proportional to which one of the following?

  21. The "antenna effect" in a poly(vinyl naphthalene) labelled with anthracene relies on interaction between naphthalene and anthracene via:

  22. The pH induced helix-coil transition of poly(L-glutamic acid) in aqueous solution is most easily followed using which spectroscopic technique?

  23. Linear dichroism and circular dichroism are both observable for

  24. Poly(L-lysine) exhibits circular dichroism near 200 nm and an Amide I vibration near 1750 cm-1. To one significant figure, the ratio (CD:IR) of the energies of the photons involved in these transitions is

  25. The melting point of high molecular weight linear polyethylene is closest to

  26. In the Lennard-Jones parameters epsilon and sigma for the atoms in poly(vinyl bromide),

  27. The population of rotational isomers is independent of temperature in

  28. At 300 K the ratio of the populations of the trans and gauche+ states in n-butane is approximately

  29. The value of the derivative of ln <r2>0 with respect to T for amorphous polyethylene is closest to

  30. The chain with the largest characteristic ratio is

  31. The chain with the smallest characteristic ratio is

  32. Which model has a different value of <r2>/<RG2> from the other three models?

  33. Isolated long self-avoiding chains of N steps on a cubic lattice have mean square dimensions proportional to Na, with a =

  34. Isolated long self-avoiding chains on a cubic lattice have the dimensions expected in a Theta solvent when the interaction between a bead and a nearest neighbor unoccupied site is

  35. In a Theta solvent, large linear and cyclic polystyrene molecules of the same molecular weight have mean square radii of gyration that differ by a factor of

  36. A 31 helix is found in the crystalline state of

  37. Stretching converts the alpha helix of poly(L-alanine) to the beta sheet because of differences in the

  38. The unit cell of the antiparallel beta sheet has

  39. Cooling a symmetric diblock copolymer to a temperature below its order-disorder transition produces a morphology that is

  40. In the direction normal to the surface presented by a polyethylene melt to a vacuum, the density changes from bulk density to zero over a distance on the order of

  41. The chemical potential of a solvent in a two-component ideal solution

  42. etasp/c vs. c often increases as c approaches 0 for

  43. For polymers of different architectures, GPC data is most likely to give a linear plot as

  44. For fractions of a homopolymer in a good solvent, as Mn increases, the effect of nonideality on the ability to determine the true value of Mn

  45. The crystal face with the largest area is the one on which deposition is

  46. The alpha, beta, and gamma forms of isotactic polypropylene all have

  47. The lowest energy tight fold for the (110) plane in polyethylene has an energy (kcal/mol) of about

  48. The orientation of bonds in simulations of semicrystalline polyethylene suggests that the width of the interfacial region is on the order of

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October 30, 2002
Wayne L. Mattice: wlm@polymer.uakron.edu