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IA Ch 13,14
Terms, Def and Theory
8
Chemistry
Undergraduate 3
10/14/2013

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Cards

Term
What are the specs of a deuterium/hydrogen lamp?
Definition
Range: 160-800nm
Effective range 190-400nm
Excited atoms by electrical discharge cause photon
Term
What are the specs of a tungsten filament lamp?
Definition
Range: 350-2500nm
Eff Rang 350-800nm
Blackbody emitter
Term
What are the specs of a Xenon arc lamp lamp?
Definition
Range 200-1000nm
Eff Range: 200-800nm
Term
How do losses occur regarding the cuvette?
Definition
Losses occur from reflection and scattering
Term
What is the effect of slit width on peak height?
Definition
Radiant power is proportional to (slitwidth)^2
Term
What are the assumptions made by Beer's Law?
Definition
1)A monochromatic beam of light transversing a sample of absorbing molecules loses it intensity exponentially
2)Absorption changes as a fcn of frequency and wavelength
3)Absorption is proportional to conc. (All sp. abs equally)
4)Absorbing substances do not interact w/ ea. other or interfere w/ ea. other's absorption properties
Term
Define absorption
Definition
Promotion of compound to higher energy state w/o relaxation
Term
What are limitations on Beer's Law?
Definition

Instrumental deviations

-Stray radiation/light

-polychromatic radiation/light

-mismatched cells

 

Chemical deviations

-High analyte or low analyte concentrations

-Changes to refractive index of the solvent

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