Chapter 3 Discovering the atom and subatomic particles (History of modern chemistry)
Chapter 3 Discovering the atom and subatomic particles (History of modern chemistry)
3.1 Chemistry developed out of interest in materials The ability to control fire allowed ancient people to prepare copper(7000 years ago) and iron (3200 years ago) for tools and Weapons 商代青铜器(铜锡合金
3.1 Chemistry developed out of interest in materials The ability to control fire allowed ancient people to prepare copper (7000 years ago) and iron (3200 years ago) for tools and weapons. 商代青铜器(铜锡合金)
执 y× 空气 湿 水 Aristotle 四原说示意图 384-322B.C Aristotle described the composition and behavior of matter in terms of four qualities: hot, cold, moist and dry. a material is possible to be transformed to another material by changing the relative proportion of these four qualities. Gold can be made from other metals(Alchemy)
Aristotle described the composition and behavior of matter in terms of four qualities: hot, cold, moist, and dry. A material is possible to be transformed to another material by changing the relative proportion of these four qualities. Gold can be made from other metals (Alchemy). Aristotle 384 - 322 B.C. 热 干 冷 湿 火 空气 水 土 四原说示意图
Democritus started thinking about atom(not cut or that which is indivisible) Tiny, hard, uncuttable A’omne sphere DEMOCRITUS'S MODEL
Democritus started thinking about “atom” (not cut or that which is indivisible)
Antoine laurent lavoisier Chimiste francais(Paris, 1743-Id 1794) Father of modern chemistry unfortunate association with a company organized to collect taxes for King louis adied at guillotine of no use to the New republic of france headless body buried in unmarked grave Showed conservation of mass in chemical reactions invented precise scale to weigh small amounts of matter accurate to 0.0005 grams, about 1/100 of a drop of water -mass of all reactants= mass of all products cannot create matter from nothing can only change form "matter is not created from nothing, only changes form during chemical reactions
Father of modern chemistry ▪unfortunate association with a company organized to collect taxes for King Louis ▪died at guillotine of no use to the New Republic of France ▪headless body buried in unmarked grave Showed conservation of mass in chemical reactions ▪invented precise scale to weigh small amounts of matter accurate to 0.0005 grams, about 1/100 of a drop of water ▪mass of all reactants = mass of all products ▪cannot create matter from nothing, can only change form ▪matter is not created from nothing, only changes form during chemical reactions