First-order reactions and half-life
Set the starting concentration and the half-life to see the rate constant, the concentration now and the rate.
Learn first order reactions properly
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Questions students ask
How do you recognise a first-order reaction?
Its half-life is constant: the concentration halves in the same time however much is left.
What formula does it use?
[A] = [A]₀e^(−kt); half-life = ln 2 / k.
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