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Spectroscopy
Midterm Exam
10
Chemistry
Undergraduate 1
02/27/2010

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Term
absorbance
Definition
(A) defined as A=log(P initial/P) where P initial is the radiant power of light striking the sample on one side and P is the radiant power emerging from the other side. Also called optical density
Term
absorbance spectrum
Definition
a graph of absorbance or transmittance of light versus wavelength, frequency, or wavenumber
Term
Beer's Law
Definition
relates the absorbance (A) of a sample to its concentration (c), pathlength (b), and molar absorptivity (a), A=abc
Term
calibration curve
Definition
a graph showing the value of some property versus concentration of analyte. when the corresponding property of an unknown is measured, its concentration can be determined from the graph
Term
cuvet
Definition
a cell with transparent walls used to hold samples for spectrophotometric measurements
Term
dilution factor
Definition
the factor used to multiply the initial concentration of reagent to find the diluted concentration
Term
molar absorptivity
Definition
the constant of proportionality in Beer's Law; A=abc (A is absorbance, a is molar absorptivity, b is pathlength, and c is the molarity)
Term
spectrophotometry
Definition
in a broad sense, any method using light to measure chemical concentrations
Term
transmittance
Definition
(T), defined as T = P/P initial were P initial is the radiant power of light emerging from the other side of the sample
Term
wavelength
Definition
distance between consecutive crests of a wave
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