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Search results 2311 - 2320 of 3467 matching essays
- 2311: Oxygen
- ... abundant than any other element. Oxygen was discovered in 1774 by the British chemist Joseph Priestley and, independently, by the Swedish chemist Carl Wilhelm Scheele; it was shown to be an elemental gas by the French chemist Antoine Laurent Lavoisier in his classic experiments on combustion. Large amounts of oxygen are used in high-temperature welding torches, in which a mixture of oxygen and another gas produces a flame of much ...
- 2312: Mercury
- ... superconductive when cooled to within a few degrees of absolute zero. Mercury was once known as liquid silver or quicksilver which was studied by the alchemists. Mercury was first distinguished as an element by the French chemist Antoine Laurent Lavoisier in his experiment on the composition of air. At room temperature mercury is a shining, moving liquid that has a silvery-white color, and slightly volatile. Mercury remains a liquid over ...
- 2313: CODEINE (C18 H2, NO3 H3PO4 1/2 H2O)
- ... Sue Peterson, our two local pharmacists. We researched medical encyclopedias, journals, and magazines. Codeine is known medically as methylmorphine. It is a drug derived from opium, a poppy plant. It was discovered in 1832 by French chemist Pierre-Jean Robiquet. Codeine constitutes about 0.5 to 2.5 percent of this plant substance. The drug has been in use since the early 1900's and it shares most of the pharmacologic ...
- 2314: Historical Development of Atomic Structure
- ... professor at the University of Cambridge, the University of Manchester (both of which are in England), and at McGill College in Montreal, Canada. His importance comes after the discovery of radioactivity in 1896 by a French scientist named Becquerel. Rutherford identified the three main components of radioactivity: alpha, beta, and gamma particles. He also found the alpha particle to be a positively charged helium atom. Also, Rutherford was the first one ...
- 2315: Asimov On Chemistry by Isaac Asimov
- ... proved water to be an oxide. The Element of Perfection Asimov talks about astronomers in the mid 1800's, and how they made the spectroscope. Only then does he start to mention a element a french chemist belived to be new or maybe just a heavier from of nitrogen. Inert gases and there liquefaction points are then listed along when they when fisrt liquefied by a chemist. Welcome, Stranger! This talks ...
- 2316: Rubidium
- Rubidium The 37th Element Rubidium is located between potassium and cesium in the first Group on the Periodic Table. It's atomic number is 37and its atomic mass is 85.4678. In French and German it is rubidium, in Italian and Spanish it is rubidio. History and General Facts Rubidium was discovered spectroscopically in1861 by Robert Bunsen and Gustav Kirchhoff in Germany. They experimented with spectral lines of ...
- 2317: Solving the Mystery of the Romanovs
- ... the Romanovs In July of 1991, nine skeletal remains were exhumed from a mass grave in Siberia, Russia. The bones were discovered near a place where a Russian royal family was murdered during the Russian revolution. People began to question if the bones belonged to Czar Nicholas and Czarina Alexandra, three of the daughters, their son Alexi, and three traveling servants. To answer this question, scientists turned to mitochondria DNA sequence ...
- 2318: Our Solar System at a Glance
- ... the solar system. Mercury literally bakes and freezes at the same time. Days and nights are long on Mercury. The combination of a slow rotation relative to the stars (59 Earth days) and a rapid revolution around the Sun (88 Earth days) means that one Mercury solar day takes 176 Earth days or two Mercury years -- the time it takes the innermost planet to complete two orbits around the Sun! Mercury ...
- 2319: Uranium: Nuclear Friend or Nuclear Foe
- ... this year that the german chemist Martin Heinrich Klaproth identified the element uranium. Uranium was not isolated in a metallic state until 1841. The radioactive properties of uranium were first discovered in 1896 when a French physicist Antoine Henti Becquerel studied the properties of uranyl sulfate. Although science found uranium in 1789, the study of uranium dates back much further. As early as the sixteenth century it was recognized that men ...
- 2320: Helium
- Helium Helium, symbol He, inert, colorless, odorless gaseous element. In group 18 (or VIIIa) of the periodic table, helium is one of the noble gases. The atomic number of helium is 2. The French astronomer Pierre Janssen discovered helium in the spectrum of the corona of the sun during an eclipse in 1868. Helium is the lightest of all gases except hydrogen. Helium solidifies at -272.2° C (-457 ...
Search results 2311 - 2320 of 3467 matching essays
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