Chemistry / Chem 2066 · Atom · ~20 seconds
A Spontaneous Direction Is Nonspontaneous Reversed
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A process spontaneous in one direction under given conditions is nonspontaneous in the reverse direction under those same conditions.
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Iron rusts spontaneously in moist air, but rust never spontaneously reverts to iron and oxygen.
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"Nonspontaneous" does not mean impossible — it means the reverse direction needs a continual outside energy input to proceed.
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