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chromatography
a separation technique used to separate mixtures by virtue of their absorbency on a stationary medium
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  covalent prefixes
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  vapor pressure of water
  May 23 in chemistry
  1854 - Edgar Fahs Smith born: complex inorganic acids; history of chemistry.
  1908 - John Bardeen born: transistors and semiconductors; superconductivity (BCS theory); Nobel Prize (physics), 1956 and 1972.
   sources: http://webserver.lemoyne.edu/faculty/giunta/week.html, ACS Calendar,
               http://todayinsci.com
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