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#Mon Aug 09 12:12:36 CEST 2010
Text__n2vaEKOeEd-WfYQ0GneCwQ_title=Images of Chemical Laboratories over the Course of History
Text__n2vaEKOeEd-WfYQ0GneCwQ_text=The rise of modern chemistry is the result of meticulous detective work guided by specific assumptions. In the chemical laboratories of the eighteenth and nineteenth centuries, countless experiments are performed to determine which substances react with each other in which proportions. After many wasted efforts, researchers finally comprehend changes of substances qualitatively and quantitatively on the basis of assumptions about unchangeable \u201Catoms\u201D of the elements and the bonding of these atoms to \u201Cmolecules\u201D of the remaining substances.