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21 Cards in this Set

  • Front
  • Back
Absorbance
the amount of light absorbed by a sample (the amount of light that does not pass through or teflect off a sample)
absorbance spectrum
a graph of a sample's absorbance a different wavelengths
absorbance units (au)
a unit of light absorbance determined by the decrease in the amount of light in a light beam
acid
a solution that has a pH less than 7
base
a solution that has a pH greater than 7
buffer standards
solutions each of a specific pH, used to calibrate a pH meter
deuterium lamp
a special lamp used for UV spectrophotometers that produces light in the ultraviolet (UV light) part of the spectrum (200-350 nm)
hydrogen ion
a hydrogen atom which has lost an electron (H+)
lambdamax
the wavelength that gives the highest absorbance value for a sample
nanometer
10-9 meters; the standard unit used for measuring light
neutral
uncharged
pepsin
an enzyme, found in gastric juice, that works to break down food (protein) in the stomach
pH meter
an instrument that uses an electrode to detect the pH of a solution
pH paper
a piece of paper that has one or more chemical indicators on it and that changes colors depending on the amount of H+ ions in a solution
spectrophotometer
an instrument that measures the amount of light that passes through (is transmitted through) a sample
standard curve
a graph or curve generated from a series of samples of known concentration
transmittance
the passing of light through a sample
%transmittance
the % passing of light through a sample
tungsten lamp
a lamp, used for VIS spectrophotometers, that produces white light (350-700 nm)
ultraviolet light (UV light)
a wavelength of light that is used to detect colorless molecules
visible light spectrum
the range of wavelengths of light that humans can see, from approximately 350 to 700 nm; also called white light