NMR Spectroscopy || 100% no Error.
l correct answers what letter denotes nuclei spin?
1/2 correct answers Isotopes of particular interest and use to organic chemists are 1H, 13C, 19F
and 31P, all of which have I = __________
strong correct answers ________ magnetic fields are necessary for NMR spectroscopy
alpha
beta correct answers A proton aligned with the field is said to occupy the _______ spin state,
while a proton aligned against the field is said to occupy the _______ (β) spin state
+1/2 correct answers an alpha (α) spin state is: + 1/2 or -1/2?
-1/2 correct answers a beta (β) spin state is: + 1/2 or -1/2?
beta (-1/2) correct answers Which spin state is higher in energy, beta or alpha?
alpha (+1/2) correct answers Which spin state is lower in energy, beta or alpha?
alpha (+1/2)
beta (-1/2) correct answers The magnetic moment of the lower energy ________ state is aligned
with the external field, but that of the higher energy ________ spin state is opposed to the
external field.
alpha (+1/2) correct answers Which spin state is aligned with the external field?
,beta (-1/2) correct answers Which spins state is opposed to the external field?
smaller correct answers As nuclei are shielded more and more, they feel (are exposed to) a
_________ external magnetic field and therefore absorb at a frequencies different from nuclei
which are less shielded
shield correct answers weak magnetic fields --generated by moving/spinning electrons --slightly
__________ each hydrogen nuclei from the strong exterior magnetic field, β₀
magnetic field correct answers what does β₀ indicate?
more correct answers The greater the number of electrons surrounding a nucleus the _______
shielding we'd expect to find and visa versa.
shielding correct answers the reason why different hydrogens feel different magnetic field
strength is something called ________
less correct answers hydrogen nuclei that are shielded require ___________ energy to do that
plus one half to minus one half transition
2 (just think of the electrons as little randomly oriented vectors canceling out that big B zero)
correct answers Which nucleus requires less energy to go against β₀?
upfield (shielded)
downfield (deshielded) correct answers as we move to the right on the spectrum we move toward
what is called the __________ end of the spectrum.
As we move to left on the scale we move toward the __________ end of the spectrum.
y
x correct answers In an NMR spectrograph:
, 1) the ________-axis is the intensity of the recorded signal.
2) the ________-axis is the frequency of the absorbed radio energy
left correct answers on what side (left or right) are the hydrogen's that take more energy or are
deshielded?
right correct answers on what side (left or right) are the hydrogen's that take less energy or are
shielded?
left correct answers What side is downfield?
right correct answers What side is up field?
left correct answers What side is deshielded?
right correct answers What side is more shielded?
left correct answers the most deshielded group should be farthest to the ______ on the spectrum
splitting correct answers spin-spin coupling results in ___________ signals we thought would
otherwise be single peaks (singlets).
spin spin coupling correct answers _________ results in splitting signals we thought would
otherwise be single peaks (singlets).
non-equivalent correct answers spin spin coupling occurs whenever ___________ hydrogen
atoms are located three bond lengths or closer to each other.
l correct answers what letter denotes nuclei spin?
1/2 correct answers Isotopes of particular interest and use to organic chemists are 1H, 13C, 19F
and 31P, all of which have I = __________
strong correct answers ________ magnetic fields are necessary for NMR spectroscopy
alpha
beta correct answers A proton aligned with the field is said to occupy the _______ spin state,
while a proton aligned against the field is said to occupy the _______ (β) spin state
+1/2 correct answers an alpha (α) spin state is: + 1/2 or -1/2?
-1/2 correct answers a beta (β) spin state is: + 1/2 or -1/2?
beta (-1/2) correct answers Which spin state is higher in energy, beta or alpha?
alpha (+1/2) correct answers Which spin state is lower in energy, beta or alpha?
alpha (+1/2)
beta (-1/2) correct answers The magnetic moment of the lower energy ________ state is aligned
with the external field, but that of the higher energy ________ spin state is opposed to the
external field.
alpha (+1/2) correct answers Which spin state is aligned with the external field?
,beta (-1/2) correct answers Which spins state is opposed to the external field?
smaller correct answers As nuclei are shielded more and more, they feel (are exposed to) a
_________ external magnetic field and therefore absorb at a frequencies different from nuclei
which are less shielded
shield correct answers weak magnetic fields --generated by moving/spinning electrons --slightly
__________ each hydrogen nuclei from the strong exterior magnetic field, β₀
magnetic field correct answers what does β₀ indicate?
more correct answers The greater the number of electrons surrounding a nucleus the _______
shielding we'd expect to find and visa versa.
shielding correct answers the reason why different hydrogens feel different magnetic field
strength is something called ________
less correct answers hydrogen nuclei that are shielded require ___________ energy to do that
plus one half to minus one half transition
2 (just think of the electrons as little randomly oriented vectors canceling out that big B zero)
correct answers Which nucleus requires less energy to go against β₀?
upfield (shielded)
downfield (deshielded) correct answers as we move to the right on the spectrum we move toward
what is called the __________ end of the spectrum.
As we move to left on the scale we move toward the __________ end of the spectrum.
y
x correct answers In an NMR spectrograph:
, 1) the ________-axis is the intensity of the recorded signal.
2) the ________-axis is the frequency of the absorbed radio energy
left correct answers on what side (left or right) are the hydrogen's that take more energy or are
deshielded?
right correct answers on what side (left or right) are the hydrogen's that take less energy or are
shielded?
left correct answers What side is downfield?
right correct answers What side is up field?
left correct answers What side is deshielded?
right correct answers What side is more shielded?
left correct answers the most deshielded group should be farthest to the ______ on the spectrum
splitting correct answers spin-spin coupling results in ___________ signals we thought would
otherwise be single peaks (singlets).
spin spin coupling correct answers _________ results in splitting signals we thought would
otherwise be single peaks (singlets).
non-equivalent correct answers spin spin coupling occurs whenever ___________ hydrogen
atoms are located three bond lengths or closer to each other.
