Chemistry / Chem 1615 · Atom · ~20 seconds
Reactant Identity and Reaction Rate
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Two reactions that look similar can proceed at very different rates, since rate depends on the chemical identity of the specific substances reacting.
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Sodium reacts with air overnight to near completion, while iron exposed the same way is barely affected.
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Predicting sodium and iron react at comparable rates in air, both being "metal + oxygen" reactions, ignores their differing reactivity.