NMR Spectroscopy What is shielding in NMR? When the magnetic moment of an atom blocks the full induced magnetic field from surrounding nuclei Blocking parts of a molecule from Rf radiation Using a curved piece of metal to block an opponents attack Putting metal around an Rf source When the magnetic moment of an atom blocks the full induced magnetic field from surrounding nuclei Blocking parts of a molecule from Rf radiation Using a curved piece of metal to block an opponents attack Putting metal around an Rf source ANSWER DOWNLOAD EXAMIANS APP
NMR Spectroscopy What is used to cool the superconducting coil? Hydrogen Liquid helium Ice Dry ice Hydrogen Liquid helium Ice Dry ice ANSWER DOWNLOAD EXAMIANS APP
NMR Spectroscopy All hydrogen atoms have the same resonance frequency resonate at different frequencies depending on their environment. resonate at about the same frequency as carbon are attached to carbon have the same resonance frequency resonate at different frequencies depending on their environment. resonate at about the same frequency as carbon are attached to carbon ANSWER DOWNLOAD EXAMIANS APP
NMR Spectroscopy When placed in a magnetic field, all the random spins of the nuclei align with the magnetic field stop rotate to 90° away from the induced field reverse direction align with the magnetic field stop rotate to 90° away from the induced field reverse direction ANSWER DOWNLOAD EXAMIANS APP
NMR Spectroscopy Why is it important to use a deuterated solvent? NMR uses least of this solvent So the spectrometer can lock onto the sample to prevent the spectrum from drifting during aquisition They dissolve polymer the fastest Expensive solvents work best with NMR NMR uses least of this solvent So the spectrometer can lock onto the sample to prevent the spectrum from drifting during aquisition They dissolve polymer the fastest Expensive solvents work best with NMR ANSWER DOWNLOAD EXAMIANS APP
NMR Spectroscopy Coupling causes the peaks in 1H NMR spectra to be split into multiple peaks equal to the number of hydrogen on surrounding atoms, plus one multiple peaks equal to the number of hydrogens on surrounding atoms two peaks multiple peaks equal to the number of surrounding carbon atoms multiple peaks equal to the number of hydrogen on surrounding atoms, plus one multiple peaks equal to the number of hydrogens on surrounding atoms two peaks multiple peaks equal to the number of surrounding carbon atoms ANSWER DOWNLOAD EXAMIANS APP
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