Chemistry / Unit 9 Chem 1657 short lesson, about 20 seconds
The First-Order Integrated Rate Law
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The idea
For a first-order reaction, the natural log of concentration falls linearly with time, so ln[A] plotted against time gives a straight line.
In practice
Plotting ln[H2O2] against time during its decomposition produces a straight line, confirming first-order behavior.
Where people slip
A curved ln[A]-versus-time plot rules out first order — it does not merely weaken the case for it.
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