
A zero order reaction takes 5 minutes to decrease the original concentration of the reactants by half. How much longer will it take (in minutes) to have the concentration drop to a quarter of its original concentration?

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A.
Zero order reactions proceed at a constant rate. The time it takes to go from one-half to one-quarter of the original amount will be only half the time needed to go from all of the reactants to one-half of them. (Fun Fact: A first-order reaction would take 5 minutes.)
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