chem001-chapter02-notes

chem001-chapter02-notes - CHEM 001 Lecture Notes, Prof....

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CHEM 001 Lecture Notes, Prof. Wei-Min Dai 9 Chapter 2 Atoms: Are They for Real? • Very small • Smallest characteristic of a given element • Make up everything • Different for each element – Only 90 elements occur in nature Ancient Greeks and the Atom • Leucippus (fifth century B.C.E.) and Democritus (ca. 460–ca. 370 B.C.E.) postulated tiny particles of water that could not be subdivided further –Ca l led them atomos (cannot be cut)
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CHEM 001 Lecture Notes, Prof. Wei-Min Dai 10 Aristotle • Thought everything was continuous • Atoms didn’t exist • Ancient Greeks could not test either model • His view prevailed for >2000 years (ancient Greek philosophers, ca. 384–ca. 322 B.C.E.) Lavoisier (1743–1794) • Father of modern chemistry • Accurately weighed starting materials and products of reactions • Results of many quantitative experiments lead to a Law Law of Conservation of Mass • Mass is neither created nor destroyed during chemical reactions • Cannot create material out of thin air • Make new materials by rearranging atoms • Basis for chemical calculations Boyle • Redefined elements ( The Sceptical Chymist , 1661) – If a substance cannot be broken down
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This note was uploaded on 02/14/2012 for the course CHEM 001 taught by Professor Wei-mindai during the Fall '08 term at HKUST.

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chem001-chapter02-notes - CHEM 001 Lecture Notes, Prof....

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