Ch_8-2_Chemistry_of_the_Elements

Ch_8-2_Chemistry_of_the_Elements - TRENDS IN THE CHEMISTRY...

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TRENDS IN THE CHEMISTRY OF ELEMENTS Alkali Metals Low density (g/cm 3 ): Li 0.53, Na 0.97, K 0.89, Rb 1.53, Cs 1.93 Soft: Sodium cut with a knife (Potassium even softer) Small first ionization energy Small electronegativity
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Alkali Metals Continued As a group, most reactive metals: (M M + + e - M = Li, Na, K, Rb, Cs) 2M(s) + H 2 O(cold water) 2MOH(aq) +H 2 (g) Example: 2K(s) + H 2 O(l) Initial Reaction Shortly after reaction started Under Ar atmosphere Cs > Rb > K > Na > Li (Between solids; follows ease of ionization) Li > K Rb Cs > Na (Aqueous; larger hydration energy for smaller ions)
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TRENDS IN THE CHEMISTRY OF ELEMENTS Alkaline Earth Metals Low density ( but not as low as alkali metals) Small first and second ionization energy Small electronegativity Next most reactive group of metals: (M M 2+ +2e - )
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The activity series* for metals shows the relative tendency of metals to form ions. *Oxidation potentials The more active a metal the more it wants to be a positive ion. A partial list of metals is presented from the most active to the least active.
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This note was uploaded on 11/14/2010 for the course CHEM 230 taught by Professor Desilva during the Spring '08 term at Montclair.

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Ch_8-2_Chemistry_of_the_Elements - TRENDS IN THE CHEMISTRY...

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