Chemistry / Chem 1672 · Atom · ~20 seconds
Half-Life Defined
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A reaction's half-life is the interval over which the reactant concentration drops to one-half its value.
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Hydrogen peroxide's concentration falls from 1.000 M to 0.500 M in one half-life, then to 0.250 M next.
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Each half-life removes half of whatever remains at its start, not half of the original starting amount.