NMR Spectroscopy (Biochemistry) Question and Answers-Page first

NMR Spectroscopy problems

  • 1. All hydrogen atoms

  • Options
  • A. have the same resonance frequency
  • B. resonate at different frequencies depending on their environment.
  • C. are attached to carbon
  • D. resonate at about the same frequency as carbon
  • Discuss
  • 2. What is shielding in NMR?

  • Options
  • A. Using a curved piece of metal to block an opponents attack
  • B. Putting metal around an Rf source
  • C. When the magnetic moment of an atom blocks the full induced magnetic field from surrounding nuclei
  • D. Blocking parts of a molecule from Rf radiation
  • Discuss
  • 3. What is used to cool the superconducting coil?

  • Options
  • A. Hydrogen
  • B. Ice
  • C. Dry ice
  • D. Liquid helium
  • Discuss
  • 4. Better understanding of the nuclei is possible,

  • Options
  • A. with the help of wavelength spectrum
  • B. with the help of frequencies ranges
  • C. with the help of a mathematical translator called the fourier transfer algorithm
  • D. none of the above
  • Discuss
  • 5. Coupling causes the peaks in 1H NMR spectra to be split into

  • Options
  • A. two peaks
  • B. multiple peaks equal to the number of hydrogens on surrounding atoms
  • C. multiple peaks equal to the number of surrounding carbon atoms
  • D. multiple peaks equal to the number of hydrogen on surrounding atoms, plus one
  • Discuss
  • 6. Why is it important to use a deuterated solvent?

  • Options
  • A. NMR uses least of this solvent
  • B. So the spectrometer can lock onto the sample to prevent the spectrum from drifting during aquisition
  • C. Expensive solvents work best with NMR
  • D. They dissolve polymer the fastest
  • Discuss
  • 7. When placed in a magnetic field, all the random spins of the nuclei

  • Options
  • A. stop
  • B. reverse direction
  • C. align with the magnetic field
  • D. rotate to 90° away from the induced field
  • Discuss