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Quant test 4
Quant test 4
26
Driving Skills
Kindergarten
04/26/2014

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Term
Transmittance=
Definition
(irradiance of light leaving a sample 'P')/(irradiance of light entering a sample 'P0')
Term
Absorbance=
Definition
log(P0/P)= -log T
Term
Beer's law
Definition
Absorbance = (Epsilon)(b (path length))(concentration)
Term
epsilon in beers law is
Definition
molar absorptivity and is dimensionless.
Term
chromophore
Definition
molecule responsible for light absorption
Term
luminescence
Definition
emission of light from an excited molecule
Term
beer's law fails when
Definition
concentration dependent equilibrium.
very high concentrations of solute can act as a solvent.
Term
An isosbestic point
Definition
indicates that only two species are present.
Term
Flow Injection Analysis
Definition
The key is rapid, repetitive analysis – all automated, samples are mixed with reactants, reaction occurs in a mixing coil, and the mixture goes to the detector at the time of color development.
Term
Light sources are either a......
Definition
deuterium lamp, tungsten lamp or a laser
Term
Double-beam scanning spectrophotometer
Definition
Can measure absorbance as a function of time
Term
atomic absorption spectroscopy uses a ----- lamp
Definition
Hollow Cathode Lamp
Term
atomization methods
Definition
Flame
Furnace
Term
Charges species are more soluble in ----- than ----
Definition
water
organic solvents
Term
Narrow columns provide ------ resolution than wider columns but require ----- operating pressure and have ------ sample capacity.
Definition
higher
higher
less
Term
flame ionization detector is sensitive to
Definition
carbon containing compounds and is considered to be very sensitive.
Term
electron capture detector is sensitive to
Definition
analytes containing a halogen and is insensitive to hydrocarbons. It uses a radioactive 63Ni source.
Term
high boiling point generally means ------- retention time
Definition
high
Term
high polarity generally means ------ retention time.
Definition
high
Term
Energy
Definition
(plank's constant)(frequency)
or
((Na)(h)(c))/lambda
Term
'c'
Definition
speed of light
Term
'v'
Definition
frequency
Term
lambda
Definition
wavelength
Term
HCL stands for
Definition
hollow cathode lamp
Term
what is the HCL light source and why are they used?
Definition
Ne or Ar gas fills the lamp and a cathode of the same element being analyzed is used. They are needed for lines less than 0.01nm.
Term
visible spectrum is ------nm
Definition
400-800
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