chemistry history

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a history of chemistry history of chemistry 202 – group bahadirova diana early elements in 340bc aristotle proposed that all matter was made of composed of earth, wind, fire and water alchemy 1500’s – 1700’s trial and error, serendipity big claims, little returns (gold, universal solvent) discovered distillation and recrystallization 14 basic elements (didn’t know what elements were) s, hg, c, fe, pb, cu, sn, ag, au, p, as, sb, bi, zn experimental method jan baptista van helmont an element defined robert boyle (english scientist) in 1661 defined an element as: took until 1900’s to discover most elements. “certain primitive and simple or perfectly unmingled bodies, which not being made of any other bodies or of another, are the ingredients of which all those mixed bodies are immediately compounded and into which they are ultimately resolved.” joseph priestley first person to isolate elemental oxygen ~ 1780 - 1790 achieved by …

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backed this up with experimental findings daltons key ideas all matter consists of individual atoms atoms of a particular element are identical in size, weight and properties atoms of each element have a unique weight atoms are neither created or destroyed in reactions (what do you think about this?) compounds are formed from the combinations of the atoms of two or more elements the proportions and kind of elements is fixed in a given compound atoms combine in simple numerical ratios the most stable compounds of two elements contain the atoms in a one to one ratio. daltons key ideas contd.. gave hydrogen the relative atomic ‘weight’ of 1 unit, and compared other elements to this how would he do this?? jons berzelius gave the elements their various symbols synthesized many compounds isolated and purified many of the common elements calculated accurate relative atomic masses (published this in 1828) dmitri …

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a history of chemistry history of chemistry 202 – group bahadirova diana early elements in 340bc aristotle proposed that all matter was made of composed of earth, wind, fire and water alchemy 1500’s – 1700’s trial and error, serendipity big claims, little returns (gold, universal solvent) discovered distillation and recrystallization 14 basic elements (didn’t know what elements were) s, hg, c, fe, pb, cu, sn, ag, au, p, as, sb, bi, zn experimental method jan baptista van helmont an element defined robert boyle (english scientist) in 1661 defined an element as: took until 1900’s to discover most elements. “certain primitive and simple or perfectly unmingled bodies, which not being made of any other bodies or of another, are the ingredients …

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