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Unformatted text preview: exponential curve; graph of ln [A] vs. t is a
straight line with a negative slope where slope = k the rate constant. Halflife of a first
order reaction is a constant; t1/2=0.693/k. Integrated form of first order equation: ln [A]t ln
= − kt + ln [A]0 OR ln [A]0 – ln[A]t = kt OR
equations are given in the Data Book). [ A]0
= kt
[ A]t
; [A]t = [A]0ekt (the last two o
If the rate quadruples when concentration doubles: rate = k [A]2. Graph of 1/[A]
against time is a straight line for a second order reaction with a positive slope = k.
© IBID Press 2007 2 CHAPTER 6 KINETICS
(IB TOPICS 6 AND 16) SUMMARY
o
For a thirdorder reaction, if rate = k[A]3, then as [A] doubles, rate increases 8
times.
o
Rate increases with temperature when concentrations are constant, k increases
rapidly with T and is temperature dependent, producing a straight line graph...
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 Spring '10
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