Chem 126 - Chapter 15

Chem 126 - Chapter 15 - Chapter 15 Rates of Chemical...

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Unformatted text preview: Chapter 15 Rates of Chemical Reactions How fast? By what path? Quantifying a Reaction Rate Time Concentration [A] [B] B A How fast? The rate of a Chemical Reaction The rate of reaction is the increase in molar concentration of a product of a reaction per unit time or the decrease in molar concentration of a reactant per unit time. The typical unit of reaction rate is given below.-1 mol units of reaction rate = Ms L s = What Affects the Rate of a Reaction The concentration of reactants The concentration of a catalyst A catalyst is a substance that increases the rate of reaction without being consumed in the overall reaction. The temperature at which the reaction occurs. The surface area of a solid reactant or catalyst. Measuring a Reaction Rate How could you measure the rate of the following chemical reaction? 2 2 Ag O( ) 2Ag( ) + O ( ) s s g g The rate of reaction is given by the following expression: 2 d[O ] rate of rxn = dt Another Reaction Time Concentration [A] B A -d[A] rate - slope dt = = Another Reaction What are the rate expressions for the above reaction? We define the rate of reaction as the following:-d[A] rate of disappearance of A dt =-1 d[A] d[B] rate of reaction 2 dt dt = = 2A B d[B] rate of appearance of B dt = The Rate Law The rate law is an equation that relates the rate of reaction to the concentration of reactants (and possibly a catalyst) raised to various exponents (or powers). x y z rate k[A] [B] [C] = Rate constant The Rate Law For the reaction below. .there will be a rate law of the general form: cC bB aA + x y z rate k[A] [B] [C] = Dissecting the Rate Law For the above rate law: k is called the rate constant x, y and z are the reaction orders of A, B and C, respectively. x+y+z is the overall order of the reaction x y z rate k[A] [B] [C] = Determining a Rate Law Without additional information, what can we write for the rate law for this reaction? To further specify the rate law, we need some experimental data....
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This note was uploaded on 04/09/2008 for the course CHEM 126 taught by Professor Bussell during the Winter '07 term at Western Washington.

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Chem 126 - Chapter 15 - Chapter 15 Rates of Chemical...

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