107 cards
C=O bond gives a ____ peak around 1750 cm -1 .
Equation Relating Absorbance to Percent Transmittance :____
____ spectrum spans from 200 to 400 nm.
UV spectrum spans from ____ nm.
In a UV spectrum, ____.
The absorbance in UV spectrum is caused by ____.
The ____, in UV spectrum, tells us the extent of conjugation within conjugated systems.
The wavelength of maximum absorbance, in UV spectrum, tells us ____.
The ____ conjugated the compound, the lower the energy of the transition and the greater the wavelength of maximum absorbance.
The more conjugated the compound, the ____ the wavelength of maximum absorbance.
UV spectroscopy works because molecules with ____ can be excited by ultraviolet light to higher-energy antibonding orbitals.
UV spectroscopy works because molecules with π -electrons or nonbonding electrons can be ____ by ultraviolet light to higher-energy antibon…
UV spectroscopy works because molecules with π -electrons or nonbonding electrons can be excited by ultraviolet light to ____.
Molecules with a lower energy gap between ____ are more easily excited.
Molecules with a lower energy gap between highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) are ____…
Molecules with a lower energy gap between highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) can abso…
UV spectroscopy is most useful for studying compounds containing double bonds or heteroatoms with lone pairs that create ____ systems.
UV spectroscopy is most useful for studying compounds containing ____ that create conjugated systems.
____ spectroscopy is most useful for studying compounds containing double bonds or heteroatoms with lone pairs that create conjugated syste…
Because the technique for UV spectroscopy can also be used at ____ wavelengths, it is sometimes called UV–Vis spectroscopy .
Larger conjugated molecules may even absorb light in the ____.
Larger ____ molecules may even absorb light in the visible range, leading to color.
NMR spectroscopy is based on the fact that ____.
Nuclei with magnetic moments that are ____ the field are said to be in the α-state.
Nuclei with magnetic moments that are aligned with the field are said to be in the ____-state.
Nuclei with magnetic moments that are opposed to the field are said to be in the ____-state.
Nuclei with magnetic moments that are ____ the field are said to be in the β -state.
____ - state orientation, in a magnetic field, is the higher energy state.
β - state orientation, in a magnetic field, is the ____ energy state.
____ - state orientation, in a magnetic field, is the lower energy state.
α - state orientation, in a magnetic field, is the ____ energy state.
The ____ - state .
The α-state nuclei can be ____, to cause spin flip into β - state .
Magnetic resonance imaging (MRI) is a noninvasive diagnostic tool that uses ____.
In a MRI, various chemical shifts of absorbing protons are translated into ____.
In a MRI, ____ are translated into specific shades of grey.
A typical NMR spectrum is a plot of ____.
The chemical shift is an arbitrary variable with units of ____.
The ____ is an arbitrary variable with units of parts per million (ppm) of spectrometer frequency.
Chemical shift increases towards the ____.
Increasing chemical shift direction is ____.
____ chemical shift direction is downfield.
We use ____ ppm, on a NMR spectrum
The signal for TMS's 1 H atoms is assigned δ = ____.
Nuclear magnetic resonance is most commonly used to study ____.
Most hydrogen ( 1 H) nuclei come into ____ 0 to 10 ppm downfield from TMS.
Most hydrogen ( 1 H) nuclei come into resonance ____ ppm downfield from TMS.