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Unformatted text preview: action order n and m we study the rate as a function of [A] (WHILE HOLDING [B] CONSTANT) and the rate as a function of [B] (WHILE HOLDING [A] CONSTANT) Chapter 5.2 Cont’d Rate always has UNITS Let’s leave [B] constant (they’ll cancel) Chapter 5.3 Reactant Concentrations and Time From a practical standpoint, it is often very important to know the concentrations of chemical species as a function of time.  [A]t is the concentration of A for time t  [A]0 is the initial concentration of A For a first order reaction [A]t vs. time is an exponential function (exponential decay). [A] disappears more rapidly if k is large If we take the ln (natural logarithm) on both sides = This is an equation of a line The time required for half of the reactant to decompose does not depend on the initial concentration • This is called half life; Zero Order Reactions therefore ...
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 Winter '12
 Dr.ZhifengDing
 Chemistry, Atom, Mole, Stoichiometry

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