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