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Chemistry 103

Atoms and Atomic Structure. . Greek Philosophers Leucippus and Democritus. First Used the Term

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Chemistry 103

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    1. Topics Chapters (B&G) Problems Lecture # Central Science? 1 App A&B1:4a-d,8g-n,9g-n,10g-n,11,12,15-18 1 PlanetEarth 2 2:1,4-12,14,15,25-35,38,39,41,43,44,47 1 Atoms, Ions & Molecules3, 3:3,8,9,15,16,18,21,23,24,26,28,31,33,36,43,51 2 Chemical Bonding 4 3:1,2,3,7,11,12,13,17,20,22,27,31,35,36,45,47 3 Chemical Reactions Reaction in Solution 6-7, App E 4 Exam I 24 Sept. ' 02 5 'Organic' Chemistry 8-9 5 Water & Air 10-11 6 Energy & Resources 5, 12-13 7 Nutrition & Biochemistry 13-14 8-10 Exam II 22 Oct. '02 9 Chemistry of Food 15-16 11 Household Chemicals 17 12 Exam III 26 Nov. '02 13 Toxicology & Pollution 18-19 14 Final ExamTuesday, 10 December 2002 Chemistry 103/107 Lecture Lecture Topics Link to Powerpoint Viewer

    2. Atoms and Atomic Structure

    3. Greek Philosophers Leucippus and Democritus First Used the Term Atomos in the 5th Century BC Matter is composed of tiny units called atoms. As matter is divided into smaller and smaller pieces you eventually come to one atom. Plato and Aristotle, who rejected their theory, stated that matter was continuous and it could be endlessly divided.

    4. Daltons Atomic Theory John Dalton (1766-1844) proposed an atomic theory All matter is composed of tiny, indivisible particles called atoms. All atoms of a particular element are identical, but the atoms of one element differ from the atoms of any other element. Atoms of different elements combine with each other in certain whole-number proportions to form compounds. In a chemical reaction, atoms are rearranged to form new compounds; they are not created, destroyed, or changed into atoms of any other elements.

    5. Law of Conservation of Mass Lavoisier (1743-1794) In a chemical reaction, matter is neither created nor destroyed.

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