CHEM 1211 Lecture Notes - Lecture 3: Brownian Motion, Systematic Chaos
Monday, August 22, 2016
Ch 2 Atoms and uh I didn’t check the title
2.1 Brownian Motion: Atoms Comfirmed
-1827 Robert Brown noticed pollen in constant motion in water
•concluded source of the motion not from particles themselves
-1905 Einstein theory explained Brownian motion
•observations a result of molecular bombardments of the particles, water molecules
battering the pollen causing them to move
-1908 Jean Perrin confirmed Einstein’s theory
-Scanning Tunnel Microscope(STM) can form images of atoms
-Atom: smallest identifiable unit of an element
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Document Summary
Ch 2 atoms and uh i didn"t check the title. 1827 robert brown noticed pollen in constant motion in water: concluded source of the motion not from particles themselves. 1905 einstein theory explained brownian motion: observations a result of molecular bombardments of the particles, water molecules battering the pollen causing them to move. Scanning tunnel microscope(stm) can form images of atoms. Atom: smallest identi able unit of an element. 2. 2 early ideas about the building blocks of matter. Leucippus & democritus theorized matter is composed of small, indivisible particles named atoms. Plato & aristotle theorized there were no smallest parts and substances were composed of proportions of re, air, earth and water (prevailed as aristotle. Law of conservation of mass: in a chemical reaction, matter is neither created nor destroyed. Law of de nite proportions: all samples of a given compound, regardless of source or how they were prepared, have the same proportions of their constituent elements.
