CHMA10H3 Chapter 2: Chapter 2 - Atoms and Elements
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CHMA10H3 Full Course Notes
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Document Summary
Scanning tunneling microscopy (stm) found by gerl binning and heinrich. Rohrer, is a technique that can image and move individual atoms/molecules. 2. 2 early ideas about the building blocks of matter. Leucippus (5th century b. c) and democritus (460-370 b. c) theorized that matter was composed of small, indivisible particles (atomos) nothing exists except atoms and empty space . 2. 3 modern atomic theory and the laws that led to it. 1789 (antoine lavoisier): the law of conservation of mass in a chemical reaction, matter is neither created nor destroyed. 1797 (joseph proust): the law of definite proportions all samples of a given compound have the same proportions of their constituent elements. 1804 (john dalton): the law of multiple proportions when 2 elements (a & b) form. 2 different compounds, the masses of b that combine with 1g of a can be expressed as a ratio of small whole numbers.
