Reaction and Arrhenius Notes

Reaction and Arrhenius Notes - CHEM 103 Chemistry in the...

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CHEM 103 Chemistry in the Modern World Arrhenius Equation Arrhenius was a Swedish chemist (1859-1927) Explained electrical conductivity of ionic solutions Concluded that electrolytes dissociate into electrically opposite positive and negative ions Proposed that motions of these oppositely charged ions constitute a current His 1884 thesis passed the defense with the lowest possible grade (the value of his work was not understood by his thesis committee) This work won him the Nobel Prize in 1903 Discovered Arrhenius Rate Law, describing rate of chemical reactions Arrhenius Equation: Form Useful for Computation Write logarithmic form for two different absolute temperatures Subtract the two equations to eliminate ln A
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Unformatted text preview: Reaction Mechanisms Reaction mechanism is a step-by-step sequence by which reaction occurs at a molecular level To understand a chemical reaction, we must know its mechanism Study of chemical kinetics provides information on steps involved in a reaction Each step is a single molecular event, or elementary reaction Reaction intermediates can form in an elementary reaction and react in a subsequent step Overall chemical equation for reaction is sum of elementary reaction steps Reaction intermediates cancel in the sum and do not appear in net equation for reaction Catalysts are used in one step and regenerated in a subsequent step...
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