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Transcript of Chemistry Timeline
Yellow is for historical events. First Transcontinental Railroad. 1860's Niels Bohr 1913 Wallace Carothers 1935 1918 Treaty of Versailles 1440 Gutenberg printing press. 1492 Dicovery of Americas 1534 Reformation of Catholic Church 1633 Galileo convicted of heresy. 1774 Joseph Priestley Discovered oxygen, carbon monoxide and nitrogen dioxide. 1776 Declaration of Independence. 1785 Antoine Lavoisier. Law of Conservation of Mass. Alessandro Volta 1800 Electrochemical cell and batteries. 1803 John Dalton Atomic theory stating that:
1) All matter consists of small, indivisible particles.
2) Atoms of different elements have unique characteristics and weights.
3) There are three types of atoms: simple, compound and complex. 1834 Michael Faraday Electricity and electrochemistry. 1861-1865 Civil War began on April 12th, 1861. 1864 Louis Pasteur Pasteurization. 1867 Alfred Nobel Dynamite, Nobel Prize. 1886 Eugen Goldstein Studied "canal rays" that had electric and magnetic properties opposite of an electron. 1895 Guglielmo Marconi Radio. 1896 Henri Becquerel Radioactivity. 1897 J.J. Thompson Experimentally determined charge to mass ratio of electrons. Studied "canal rays." 1900 Max Planck Observed spontaneous disintegration of radioactive elements into isotopes, discovered half-life. 1903 Marie Curie Radioactivity. 1905 Albert Einstein Proved existence of atoms, created General Theory of Relativity, discovered quanta. 1909 Robert Millikan Determined charge (e=1.602x10^-19 Coulomb) and mass, (e=9.11x10^-28 g) of an electron. 1911 Ernest Rutherford Studied radiations emitted from uranium and named alpha and beta particles. Established that the nucleus is very dense, very small and positively charged. Studied the structure of an atom. Worked out and presented a picture of the structure of an atom. 1914 Assassination of Archduke Ferdinand Henry Moseley Determined charges of the nuclei of most atoms. The "Atomic number of an element is equal to the number of protons in the nucleus." 1917 Bolshevik Revolution Ended WWI. 1922 Sir Frederick Banting Isolated insulin. 1923 Louis deBroglie Created basis for what is now known as "wave mechanics." Discovered the wave nature of electrons. 1927 Werner Heisenberg Principle of Indeterminacy stating that you cannot know the exact location and velocity of a particle at the same time. Philo Farnsworth Television. 1930 Erwin Schrödinger Viewed electrons as continuous clouds. "Wave mechanics." 1932 James Chadwick Proved existence of neutrons, prepared way for fission of uranium and atomic bombs. Neoprene and nylon. 1941 Pearl Harbor Pearl Harbor in Hawaii bombed by Japanese during WWII. 1942 Leo Szilard Nuclear chain reaction and atomic bomb. 1972 First Cellular Phone First cellular phone weighed 2.5 pounds, and took 10 hours to recharge! 1983 Original Concept for World Wide Web Kary Mullis Polymerase Chain Reaction. -And Dr. Charles Best