Frequently Asked Questions
Why is first-order half-life constant?
For a first-order reaction the half-life equals the natural log of two divided by the rate constant, with no concentration term, so it stays the same no matter how much reactant you start with.
How does reaction order change the half-life formula?
Zero-order half-life depends on initial concentration over twice the rate constant, first-order depends only on the rate constant, and second-order depends on one over the rate constant times the initial concentration.
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