Review Session Exam 3 - Review Session Exam 3 Chapter 5...

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Click to edit Master subtitle style Review Session Exam 3 Chapter 5 through Ionic Bonding – Chapter 7 (plus anything needed from Exams 1 & 2)
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Exam Topics Humphrey Davy in the early 1800’s passed electricity through compounds and noted: that the compounds decomposed into elements. concluded that compounds are held together by electrical forces. Michael Faraday in 1832-1833 realized that the amount of reaction that occurs during electrolysis is proportional to the electrical current passed through the compounds
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Exam Topics J.J. Thomson modified the cathode ray tube experiments in 1897 by adding two adjustable voltage electrodes. Studied the amount that the cathode ray beam was deflected by additional electric field. Thomson used his modification to measure the charge to mass ratio of electrons. Charge to mass ratio e/m = -1.75881 x 108 coulomb/g of e- Thomson named the cathode rays electrons. Thomson is considered to be the “discoverer of electrons”.
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Exam Topics In 1909 Millikan determined the charge and mass of the electron. Millikan determined that the charge on a single electron = -1.60218 x 10-19 coulomb. Using Thomson’s charge to mass ratio we get that the mass of one electron is 9.11 x 10-28 g.
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Exam Topics Eugene Goldstein noted streams of positively charged particles in cathode rays in 1886. Particles move in opposite direction of cathode rays. Called “Canal Rays” because they passed through holes (channels or canals) drilled through the negative electrode. Canal rays must be positive. Goldstein postulated the existence of a positive fundamental particle called the “proton”.
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Exam Topics Ernest Rutherford directed Hans Geiger and Ernst Marsden’s experiment in 1910. l - particle scattering from thin Au foils Gave us the basic picture of the atom’s structure. In 1913 H.G.J. Moseley realized that the atomic number determines the element . The elements differ from each other by the number of protons in the nucleus. The number of electrons in a neutral atom is also equal to the atomic number.
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Exam Topics James Chadwick in 1932 analyzed the results of α -particle scattering on thin Be films. Chadwick recognized existence of massive neutral particles which he called neutrons. Chadwick discovered the neutron.
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Exam Topics Mass number is given the symbol A. A is the sum of the number of protons
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This note was uploaded on 08/26/2008 for the course CHEM 1211 taught by Professor Atwood during the Spring '07 term at University of Georgia Athens.

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Review Session Exam 3 - Review Session Exam 3 Chapter 5...

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