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Enter your query below to search our database containing over 45,000+ essays and term papers
Search results 5191 - 5200 of 7307 matching essays
- 5191: Technetium
- Technetium Author: Nalin Balan NUCL 200 Atomic Number: 43 Atomic Symbol: Tc Atomic Weight: (97) Electron Configuration: -18-13-2 History, Properties and Uses: (Gr. technetos, artificial) Element 43 was predicted on the basis of the periodi c table, and was erroneously reported as having been discovered in 1925, at which ...
- 5192: Silicon
- ... The energy gap of silicon is 1.1 eV. This value permits the operation of silicon semiconductors devices at higher temperatures than germanium. Now I will give you some brief history of the evolution of electronics which will help you understand more about semiconductors and the silicon chip. In the early 1900's before integrated circuits and silicon chips were invented ...
- 5193: Fossil Fuels: Our Society's Dependency
- ... conclusion I don't think the need for a substitute for fossil fuels will be fully met until the demand arises. A substitute maybe found before the need, but as history demonstrates the use of it will either be delayed or will not occur. As for the economy jobs will be lost, but jobs will also be created in new areas ...
- 5194: Frank J. Horgan Filtration Plant
- ... to supply the residents of Toronto with drinking water. Its average production of drinking water is 355 million litres per day. It is also the newest filtration plant in Toronto. History The Frank J. horgan Filtration Plant was built from 1974 to 1979 on property acquired from the city of Scarborough, It opened on May 22,1980. When it opened, it ...
- 5195: Historical Development of Atomic Structure
- ... the atom (also the first component of the nucleus): the proton. The proton has a relative atomic mass of one and has a positive charge. Rutherford also went down in history as the first man to artificially cause a nuclear reaction when, in 1919, he bombarded nitrogen gas with radioactive alpha particles, which resulted in atoms of an oxygen isotope and ...
- 5196: "How Is Helium Produced?"
- ... Helium is supplied to distribution centres throughout the world in liquid form in large cryogenic containers. The Helium is filled into liquid containers, gas cylinders and cylinder packs as necessary. History of Helium Production: Government involvement in helium conservation dates to the Helium Act of 1925 which authorized the Bureau of Mines to build and operate a large-scale helium extraction ...
- 5197: The Sun
- ... galaxy we find our Sun the most important. For the sun supports life on earth and keeps the planets in a certain "line".Without the sun we could not survive. History of the Sun People have studied the stars since day one. Many cultures have studied and worshiped the sun. This was the earliest form of studying the moon. In 1611Galileo ...
- 5198: Rubidium
- ... 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 light, now called spectroscopy. They noticed that, when ...
- 5199: Aluminum: The Element
- ... aluminum bronze, alnico, and aluminum alloy, ect. Aluminum is strongly electropositive and extremely reactive. In contact with air, aluminum instantly becomes covered with a rough transparent layer of aluminum oxide. History- A Danish chemist, known as Hans Cristian Oersted, first isolated aluminum in 1825, using a chemical process involving potassium amalgam. Between 1827 and 1845, Friedrich Wohler, a German chemist, improved ...
- 5200: Essay on Metals
- ... s expensive because it's rare but why do we use it in jewellery? Gold has a couple of fairly unique properties that have made it attractive to jewellers throughout history. Prime among these is its resistance to corrosion. The only chemical that can dissolve or even tarnish pure gold is "royal water", a mixture so fiendish few of us are ...
Search results 5191 - 5200 of 7307 matching essays
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