Ch14_Outline VIC_Students

Ch14_Outline VIC_Students - Chemical Kinetics Chapter 14...

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Unformatted text preview: Chemical Kinetics Chapter 14 Chemical Kinetics VIC AGBASI Mountain View College Dallas, TX Chemistry, The Central Science , 11th edition Theodore L. Brown; H. Eugene LeMay, Jr.; and Bruce E. Bursten Chemical Kinetics Kinetics Kinetics : the study of how fast reactions take place Some reactions are fast Photosynthesis, explosions Some reactions are slow conversion of diamond to graphite, rusting of iron 2 vic agbasi/Chem1412/MVC/2011 Chemical Kinetics Kinetics In kinetics we study the rate at which a chemical process occurs, and the reaction mechanism (exactly how the reaction occurs). 3 vic agbasi/Chem1412/MVC/2011 Chemical Kinetics Importance of Studying Reaction Rates Speed up desirable reactions Minimize damage by undesirable reactions Useful in- drug design,- pollution control, and - food processing 4 vic agbasi/Chem1412/MVC/2011 Chemical Kinetics Factors That Affect Reaction Rates Physical State of the Reactants In order to react, molecules must come in contact with each other. The more homogeneous the mixture of reactants, the faster the molecules can react. 5 vic agbasi/Chem1412/MVC/2011 Chemical Kinetics Factors That Affect Reaction Rates Physical State of the Reactants In order to react, molecules must come in contact with each other. The more homogeneous the mixture of reactants, the faster the molecules can react. For reactions that involve solid reactants, the greater the surface area of the solid, the faster the rate of reaction 6 vic agbasi/Chem1412/MVC/2011 Chemical Kinetics Factors That Affect Reaction Rates Concentration of Reactants As the concentration of reactants increases, so does the likelihood that reactant molecules will collide. 7 vic agbasi/Chem1412/M VC/2011 Chemical Kinetics Factors That Affect Reaction Rates Temperature At higher temperatures, reactant molecules have more kinetic energy, move faster, and collide more often and with greater energy. 8 vic agbasi/Chem1412/MVC/2011 Chemical Kinetics Factors That Affect Reaction Rates Presence of a Catalyst Catalysts speed up reactions by changing the mechanism of the reaction. Catalysts are not consumed during the course of the reaction. 9 vic agbasi/Chem1412/MVC/2011 Chemical Kinetics Rate of Reaction Expressed as either: Rate of disappearance of reactants (decrease or negative) OR Rate of appearance of products (increase or positive) 10 vic agbasi/Chem1412/MVC/2011 Chemical Kinetics Rate of Reaction A B 11 vic agbasi/Chem1412/MVC/2011 Chemical Kinetics Rate of Reaction Equation A B rate = Why the negative on [A]? [A] [B] or t t - 12 vic agbasi/Chem1412/MVC/2011 Chemical Kinetics Reaction Rates The reaction rates of chemical reactions are the amounts of a reactant reacted or the amount of a product formed per unit time....
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Ch14_Outline VIC_Students - Chemical Kinetics Chapter 14...

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