How concentration changes with time. The integrated equations for zero order and first order reactions, half-life and the time for any fraction to react, and pseudo first order reactions.
3 lessons, about 1 h 50 min5 simulations11 problems8 practice questionsPython in every lesson
Created by StemPy LabSome reactions use up their reactant at a steady rate, however much is left. A single ticket counter does the same with a queue. For such a zero order reaction the concentration falls in a straight line, the reaction ends at a fixed time, and the half-life depends on how much you start with.
After you take a medicine, the body clears the same fraction of it every hour. That is a first order process, and many reactions follow it. The integrated equation gives the concentration at any time, and a graph of ln[R] against time is a straight line whose slope is minus k.
How long does a reaction take to half finish? For a first order reaction the answer is the same at every stage, and it is 0.693 divided by k. This makes half-life a quick tool for the time and for the order. Some reactions with two reactants also act as first order when one of them is in large excess.
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