Discovery - 100 Greatest Discoveries - 3 of 9 - Chemistry

Discovery - 100 Greatest Discoveries - 3 of 9 - Chemistry
XviD | 4000 kbps | 1280x720 | 29.97 fps | AC3 | 45 min | RS | 1.36 GB

Scientists have transformed the way we think and live throughout the centuries. What are the most important scientific discoveries of all time? In no particular order, we present the top 100 in eight different categories:

Astronomy - Explore the universe *** Biology - Explore the world around you *** Chemistry - Explore the world under a microscope *** Earth Science - Explore the Earth under your feet *** Evolution - Explore the past *** Genetics - Explore what makes you, you *** Medicine - Explore developments in health *** Physics - Explore how stuff works

Joseph Priestley initiated the study of chemistry in 1770 with the discovery of oxygen.
From there, witness the development of plastics and a familiar table that has confounded high school chemistry students for generations.

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Chemistry 1. Oxygen (1770s) Joseph Priestley discovers oxygen; later, Antoine Lavoisier clarifies the nature of elements. Priestley produces oxygen in experiments and describes its role in combustion and respiration. Then, by dissolving fixed air in water, he invents carbonated water. Priestley, oblivious to the importance of his discovery, calls the new gas "dephlogisticated air." Lavoisier gives oxygen its name and correctly describes its role in combustion. Lavoisier then works with others to devise a chemical nomenclature, which serves as the basis of the modern system. 2. Atomic Theory (1808) John Dalton provides a way of linking invisible atoms to measurable quantities like the volume of a gas or mass of a mineral. His atomic theory states that elements consist of tiny particles called atoms. Thus, a pure element consists of identical atoms, all with the same mass, and compounds consist of atoms of different elements combined together. 3. Atoms Combine Into Molecules (1811 onward) Italian chemist Amedeo Avogadro finds that the atoms in elements combine to form molecules. Avogadro proposes that equal volumes of gases under equal conditions of temperature and pressure contain equal numbers of molecules. 4. Synthesis of Urea (1828) Friedrich Woehler accidentally synthesizes urea from inorganic materials, proving that substances made by living things can be reproduced with nonliving substances. Until 1828, it was believed that organic substances could only form with the help of the "vital force" present in animals and plants. 5. Chemical Structure (1850s) Friedrich Kekule figures out the chemical structure of benzene, bringing the study of molecular structure to the forefront of chemistry. He writes that after years of studying the nature of carbon-carbon bonds, he came up with the ring shape of the benzene molecule after dreaming of a snake seizing its own tail. The unusual structure solves the problem of how carbon atoms can bond with up to four other atoms at the same time. 6. Periodic Table of the Elements (1860s – 1870s) Dmitry Mendeleyev realizes that if all of the 63 known elements are arranged in order of increasing atomic weight, their properties are repeated according to certain periodic cycles. He formulates the periodic table of the elements and predicts the existence of elements that have not yet been discovered. Three of those elements are found during his lifetime: gallium, scandium and germanium. 7. Electricity Transforms Chemicals (1807 – 1810) Humphry Davy finds that electricity transforms chemicals. He uses an electric pile (an early battery) to separate salts by a process now known as electrolysis. With many batteries he is able to separate elemental potassium and sodium in calcium, strontium, barium and magnesium. 8. The Electron (1897) J.J. Thomson discovers that the negatively charged particles emitted by cathode ray tubes are smaller than atoms and part of all atoms. He calls these particles, now known as electrons, "corpuscles." 9. Electrons for Chemical Bonds (1913 onward) Niels Bohr publishes his model of atomic structure in which electrons travel in specific orbits around the nucleus, and the chemical properties of an element are largely determined by the number of electrons in its atoms' outer orbits. This paves the way to an understanding of how electrons are involved in chemical bonding. 10. Atoms Have Signatures of Light (1850s) Gustav Kirchhoff and Robert Bunsen find that each element absorbs or emits light at specific wavelengths, producing specific spectra. 11. Radioactivity (1890s – 1900s) Marie and Pierre Curie discover and isolate radioactive materials. After chemically extracting uranium from uranium ore, Marie notes the residual material is more "active" than the pure uranium. She concludes that the ore contains, in addition to uranium, new elements that are also radioactive. This leads to the discovery of the elements polonium and radium. 12. Plastics (1869 and 1900s) John Wesley Hyatt formulates celluloid plastic for use as a substitute for ivory in the manufacture of billiard balls. Celluloid is the first important synthetic plastic and is used as a substitute for expensive substances such as ivory, amber, horn and tortoiseshell. Later, Leo Baekeland invents hardened plastics, specifically Bakelite, a synthetic substitute for the shellac used in electronic insulation. 13. Fullerenes (1985) Robert Curl, Harold Kroto and Rick Smalley discover an entirely new class of carbon compound with a cage-like structure. This leads to the discovery of similar tube-like carbon structures. Collectively, the compounds come to be called buckminsterfullerenes, or fullerenes. The molecules are composed entirely of carbon and take the form of a hollow sphere, ellipsoid, tube or ring. Named for Richard Buckminster Fuller, the architect who created the geodesic dome, they are sometimes called "buckyballs" or "buckytubes."

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Docus
This is the folder name!

For questions or problems please leave me a pm, I can't always keep track of all comments to my posts. Thanks!
of course please leave a comment here too (even without problem)

All RAR files have a 2% recovery record , so you can repair them by selecting all files (of the set) in the WinRar file browser, right-clicking on them and choosing "repair". You'll get a set of files starting with fixed_ and all re-re-re downloading should be eliminated.

Edit Del

Posted By: aragonit Date: 31 Dec 2007 06:50

The pass is (as for the whole series) www.docs4you.org

Edit Del

Posted By: Flasher8 Date: 02 Jan 2008 21:10

Where are the download links??
Unable to find in your folder/s as well???

Would appreciate your posting the links soon.

Thanks in advance.

Edit Del

Posted By: Flasher8 Date: 02 Jan 2008 21:13

Where are the download links??
Unable to find in your folder/s as well???

Would appreciate your posting the links soon.

Thanks in advance.

Edit Del

Posted By: Flasher8 Date: 02 Jan 2008 21:14

Where are the download links??
Unable to find in your folder/s as well???

Would appreciate your posting the links soon.

Thanks in advance.

Edit Del

Posted By: EErbp Date: 10 Jan 2008 00:35

Here are the links! http://rapidshare.com/users/Q7HYJ2

To find this link, goto "http://rapidshare.com/users/8FFJHY" which is the link in Docus just below the graphics in the main window above. Then, find "Docus ID=19" in the table. Just below the button you will find the link I entered above: namely "http://rapidshare.com/users/Q7HYJ2". I'm not sure why this cryptic process is needed. Could be a simple misteak. [ ;) ]
Thanks you aragonit for the DL. Nice stuff. I am looking forward to the rest of the series.
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