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