Chemistry / Unit 9 Chem 1672 short lesson, about 20 seconds
Half-Life Defined
Captions available
The idea
A reaction's half-life is the interval over which the reactant concentration drops to one-half its value.
In practice
Hydrogen peroxide's concentration falls from 1.000 M to 0.500 M in one half-life, then to 0.250 M next.
Where people slip
Each half-life removes half of whatever remains at its start, not half of the original starting amount.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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