Chemistry / Chem 1618 · Atom · ~20 seconds
Physical State and Surface Area
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State
A reaction between different phases occurs only at their shared interface, so a solid divided into smaller pieces reacts faster.
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Iron powder reacts with dilute hydrochloric acid far faster than one iron nail of the same total mass.
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More surface area speeds a heterogeneous reaction only where phases meet — total mass does not itself set the rate.
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