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    » A chemical substance is a material with a definite chemical composition. It is a concept that became firmly established in the late eighteenth century after work by the chemist ...

    » We offer comprehensive selection of high-quality lab supplies, chemicals, lab chemicals, lab equipment, regulatory compliance, industrial gases, pumps, spill control. Also ...

    » Chemistry (from Egyptian kēme (chem), meaning "earth") is the science concerned with the composition, structure, and properties of matter, as well as the changes it undergoes ...

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    » Dr. Joseph S. Francisco (Purdue University) to serve as the Society's President-Elect in 2009. Learn more about him and see all election results.