Acc Chem Scientists
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Created by:
alexadanielle5 on November 10, 2011
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18 terms
Terms | Definitions |
|---|---|
 Democritus and Leucippus (5th century BC) | Discontinuous Theory of Matter- you can only cut matter in half untill you reach an endpoint |
| Aristotle (4th century BC)(1700s) | Continuous Theory of Matter- you can cut matter in half forever |
| Boyle(1600's) & Lavoisier(1700's) | Father's of Chemistry |
| Lavoisier(1700's) | Law of Concervation of Matter- the mass of substancespresent after a chemical reaction is equal to the mass of the substances entering into th reaction (mass reactants=mass product) |
| Proust & Berzelius (1800's) | Law of Definite Proportions hydrogen and oxygen experiment |
| Proust (1800's) | Law of Definite Proportions- different samples of any pure compound contain the same elements in the same proportions by mass |
| Berzelius (1800's) | Law of Constant Composition- different samples of any pure compound contain the same elements in tesame proprtions by mass |
| Dalton's Atomic Theory (1800's) late 18th centuy early 19th | Law of Multiple Proportions- when two elements can combine to form more than one compound, the amounts of one of them that combines with a fixed amountof the other in a whole number ratio |
| Becquerel (1852-1908) | Discovered Radioactivity-spontaneous decay of the nucleous in the form of apha particles (He nucleus), beta particles (hi-E electros), and gamma rays (hi-E photons) |
| Crokes (1837-1919) | (1879) Cathode Ray Tube and electron discovered (tv) no matter what substance s put in yl still get a beam of electrons |
| J.J. Thomson (1856-1940) | (1897) Modifies Cathode Ray Tube and charge to mass ratio for e- exposedray to a controlled charged feild |
| Tesla | build electrons high voltge low amprage |
| Millikan (1868-1953) | 1909 Determines te mass of an electron oil drop experiment |
| Rutherford (1871-1937) | 1911 Discoered the nucleus (gold foil experiment) alpha particles some go through foild some bounce back some some bounce around |
| Hans Geiger (1882-1945) | Rutherford's associate |
| James Chadwick (1891-1974) | Discovered the neutron (a nn-charged particl from radioactive ecay) |
| Niels Bohr (1885-1962) | 1913 planetary model |
| Heisenberg, Schrodinger, de Broglie (20th Century) | Quantum Mechanical Model (1926)- based upon the work of several men, a new model was developed that is still used today |
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