Test
MO19 Quality Control II
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Preguntas del test (11)
1Choose the incorrect statement.
- AThe UV-Vis spectrum of light has a higher frequency than infrared light
- BLight from the UV-Vis spectrum can excite electrons to higher orbitals if the incoming photon (hv) matches the energy gap of a specific transition
- CThe UV-Vis spectrum of light has a lower energy than infrared light
2Choose the incorrect statement about chromophores.
- AChromophores are a particular part of the molecule that electronic transitions are associated with.
- BAs a general rule for UV-Vis, the chromophore contains unsaturation eg double and triple bonds (pi-orbitals)
- CA pair of non bonding electrons can also act as a chromophore
- DThe more conjugated the chromophore, the shorter the wavelength of absorption
3Liquids with chromophores may be useful as solvents in UV-Vis spectroscopy.
- AVerdadero
- BFalso
4Water is a good solvent for Uv-Vis spectroscopy.
- AVerdadero
- BFalso
5The absorption of chromophores are affected by auxochromes. Choose the incorrect statement about auxochromes.
- AAuxochromes are a group of atoms with no notable absorption above 200 nm
- BAuxochromes are unsaturated groups with non-bonding electrons which can conjugate with the chromophore
- CAuxochromes affect the energy and intensity of transitions
6Auxochrome effects:
- [blank_start]Bathochromic shift[blank_end] – displacement of maximum absorption to a longer wavelength (red shift)
- [blank_start]Hypsochromic shif[blank_end]t – displacement of maximum absorption to a shorter wavelength (blue shift)
- [blank_start]Hyperchromic shift[blank_end] – increase in absorption at a particular λmax
- [blank_start]Hypochromic shift[blank_end] - decrease in absorption at a particular λmax- ABathochromic shift
- BHypsochromic shif
- CHyperchromic shift
- DHypochromic shift
7Label the shifts.
- ABathochromic
- BHypsochromic
- CHyperchromic
- DHypochromic
8Increased conjugation has a:
- Abathochromic and hyperchromic shift
- Bbathochromic and hypochromic shift
- Chypsochromic and hyperchromic shift
- Dhypsochromic and hypochromic shift
9Drugs that have acidic or basic auxochromes have pH dependent spectra.
- AVerdadero
- BFalso
10Why is UV-Vis spectroscopy not good for identifying compounds?
- AIt is not very specific i.e. structurally unrelated compounds can give similar or identical absorption spectra.
- BIt is not very informative i.e. different functional groups cannot be identified.
11In the Beer Lambert Law, A = a.c.l, A is the [blank_start]molar absorbance[blank_end] while a is the [blank_start]specific absorbance[blank_end], symbol [blank_start]A(1%, 1 cm)[blank_end].
- Amolar absorbance
- Bspecific absorbance
- CA(1%, 1 cm)
Información
- Descripción
- (Molecules) PHCY211 Test sobre MO19 Quality Control II, creado por Mer Scott el 13/04/2018.
- Autor
- Mer Scott
- Idioma
- English
- Visitas
- 13
- Historial
- Creado el 13 abr 2018 · actualizado el 14 abr 2018
- Etiquetas
- Valoración
- Aún sin valoraciones Valora este test