Chemistry / Unit 9 Chem 1618 short lesson, about 20 seconds
Physical State and Surface Area
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The idea
A reaction between different phases occurs only at their shared interface, so a solid divided into smaller pieces reacts faster.
In practice
Iron powder reacts with dilute hydrochloric acid far faster than one iron nail of the same total mass.
Where people slip
More surface area speeds a heterogeneous reaction only where phases meet — total mass does not itself set the rate.
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