Chemistry / Chem 1632 · Atom · ~20 seconds
The Rate Law and Reaction Order
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A rate law expresses a reaction's rate as its rate constant times each reactant's concentration raised to that reactant's reaction order.
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rate = k[H2O2] states that hydrogen peroxide's decomposition is first order in hydrogen peroxide.
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A reaction order is usually a small positive integer, but it can be a fraction, zero, or negative — nothing guarantees a whole number.