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Jan 1, 1000
Democritus
proposed the idea that matter was not infinitely divisible. He believed matter was made up of tiny individual particles called atomos. Democritus believed that atoms could not be created, destroyed, or further divided
460 BC -
Jan 1, 1000
Aristotle
declares existence of 4 elements air, fire, water, earth and two alternatives hot & cold, and dry & moist
638 BC -
Jan 1, 1215
magna carta
The Magna Carta is a document that King John of England was forced into signing. The purpose of the Magna Carta was to curb the King and make him govern by the old English laws that had prevailed before the Normans came. he Magna Carta demonstrated that the power of the king could be limited by a written grant. -
Jan 1, 1450
printing press
invented by Johannes Guttenberg and it made printing books, newspapers, etc faster to make and cheaper for the citizens -
shakespeare dies
one of the best writer of all time dies and leaeves behind 38 plays, 154 sonnets, two long narrative poems, and several other poems -
The American Revolution
battle between britian and the US for freedom from britian -
Antoine Lavoisier
mass conserved through course of chemical reaction -
Joseph Proust
Law of Definite Proportions -
Louisiana purchase
the US bought the Louisiana purchase from France and it nearly doubled the size of the US -
John Dalton
daltons atomic theory -
Amedeo Avogadro
Avogadro's law, states that equal volumes of gases, at the same temperature and pressure, contain the same number of molecules -
War of 1812
war between the US and Great Britian over the impressment of US sailors into the British Navy -
California Gold Rush
Gold was found in California and many people rushed to California to try and get rich off of gold -
William Crookes
theory of radiant matter, cathode rays -
Henri Becquerel
helped discover radiation -
J.J. Thomson
determine the charge-to-mass ratio of the charged particle, discovery of the electron and of isotopes -
Max Planck
thermodynamics, E=hv, black body radiation equation, matter can gain or lose energy only in small, specific amounts called quanta. That is, a quantum is the minimum amount of energy that can be gained or lost by an atom -
Albert Einstein
theory of special relativity, the photoelectric effect, Brownian motion -
Robert Millikan
discovered charge of electron -
Ernest Rutherford
studied alpha particles -
Madame Curie
researched radium, discovered radium and polonium, helped discover radiation -
Henry Moseley
discovered that atoms of each element contain a unique positive charge in their nuclei -
world war one
archduke Francis Ferdinand was assassinated and the nations went to war to avenge his death including German, Austria-Hungary, Ottoman Empire, Bulgaria, Serbia, Russia, France, Britain, Belgium, Romania, US, and Italy -
Niels Bohr
made the Bohr model an atom, the theory that electrons travel in discrete orbits around the atom's nucleus. -
Louis deBroglie
researched quantum theory, discovered wave nature of electrons -
Werner Heisenberg
the uncertainty principle and theory of quantum mechanics -
Erwin Schrodinger
quantum mechanical model of the atom, The Schrödinger equation, and Schrödinger's cat -
James Chadwick
discovered the neutron -
atomic bomb
bomb dropped on Hiroshima and Nagasaki Japan which made them surrender from WW2 -
Period: to
chemistry colin kern
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terrorist attacks
al-Qaeda hijacked four passenger jets. The hijackers intentionally crashed two planes into the Twin Towers of the World Trade Center in New York City; both towers collapsed within two hours. Hijackers crashed American Airlines Flight 77 into the Pentagon in Arlington, Virginia. The fourth jet, United Airlines Flight 93, crashed into a field near Shanksville, Pennsylvania, after passengers attempted to take control before it could reach
