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Unformatted text preview: A constant half-life inversely proportional to the rate constant. 2. Simple Second-Order Rxns: 2 ] [ ] [ A k dt A d =-Leads to an integrated form: kt A A t + = ] [ 1 ] [ 1 and an expression for the half life: ] [ 1 A k = Second-order reactions are characterized by: Plot of 1/[A] vs time is linear with positive slope (equal to rate constant); A half-life that is not constant (increases as [A] falls). This works the other way around: If a plot of ln[A] vs time is linear with negative slope, then the reaction IS first order; if a plot of 1/[A] vs time is linear with positive slope, the reaction is second order....
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- Fall '07