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1000 BCE
Alchemists
Alchemists (~1000-1650)
Among other things, the alchemists sought a universal solvent, attempted to change lead and other metals into gold, and tried to discover an elixir which would prolong life. -
465 BCE
Democritus
Democritus (465 BC)
First to propose that matter exists in the form of particles. Coined the term 'atoms'. -
384 BCE
Aristotle
Believed in four enemy’s air earth fire and water -
1100
Lodestone
1100s
Oldest written description of lodestone used as a compass. -
Sir Robert
Boyle, Sir Robert (1637-1691)
Formulated the fundamental gas laws. First to propose the combination of small particles to form molecules. Differentiated between compounds and mixtures. -
Torricelli
Torricelli, Evangelista (1643)
Invented the mercury barometer. -
Bradley James
Bradley, James (1728)
Uses aberration of starlight to determine the speed of light to within 5%. accuracy. -
Scheele
Scheele, C.W. (1742-1786)
Discovered chlorine, tartaric acid, metal oxidation, and sensitivity of silver compounds to light (photochemistry). -
Le Blanc
Le Blanc, Nicholas (1742-1806)
Invented process for making soda ash from sodium sulfate, limestone, and coal. -
Anton la voisier
Father of modern chemistry becuase he relied on quantitative observation to develop conclusions -
Volta
Volta, A. (1745-1827)
Invented the electric battery. -
Jenner
Jenner, Edward (1749-1823)
Development of smallpox vaccine (1776). -
Benjamin Franklin
Franklin, Benjamin (1752)
Demonstrated that lightning is electricity. -
Proust
The law of f definite proportions called the law of constant composition states that a chemical compound always contains exactly the same proportion of elements by mass -
Dalton John
Dalton, John (1766-1844)
Proposed atomic theory based on measurable masses (1807). Stated law of partial pressure of gasses. -
Avogadro
Avogadro, Amedeo (1776-1856)
Proposed principle that equal volumes of gasses contain the same number of molecules. -
Sir Humphrey
Davy, Sir Humphry (1778-1829)
Laid foundation of electrochemistry. Studied electrolysis of salts in water. Isolated sodium and potassium. -
Gay Lussac
Gay-Lussac, J.L. (1778-1850)
Discovered boron and iodine. Discovered acid-base indicators (litmus). Improved method for making sulfuric acid. Researched behavior of gasses. -
Berzelius
Berzelius J.J. (1779-1850)
Classified minerals according to their chemical composition. Discovered and isolated many elements (Se, Th, Si, Ti, Zr). Coined the terms 'isomer' and 'catalyst'. -
Coulomb
Coulomb, Charles (1795)
Introduced the inverse-square law of electrostatics. -
Walther Herman
Nernst, Walther Hermann (1864-1941)
Nobel Prize in 1920 for work in thermochemistry. Performed basic research in electrochemistry and thermodynamics. -
Air John Joseph Thomson
Conintues experimenting has n the crt J.J. Thomas doubt the ray deflected away from the negitive plate and toward the positive -
Ernest Rutherford
Stretched a sheet of gold foil i a tin cat and coated the inside with a flourecent paint -
Chadwick
Prices the existence of another subatomic particle that had no charge named it the neutron