Chemistry / Chem 1624 · Atom · ~20 seconds
Concentration and Reaction Rate
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Raising a reactant's concentration usually raises a reaction's rate, since more particles per volume means more collisions between them.
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Phosphorus burns far more rapidly in pure oxygen than in ordinary air, where oxygen is only about a fifth of the gas present.
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"Usually" matters — exactly how rate responds to concentration is a separate, experimentally determined question, taken up next.