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The correct difference between first and second order reactions is that:

1. The rate of a first-order reaction does not depend on reactant concentrations, the rate of a second-order reaction does depend on reactant concentrations
2. The rate of a first-order reaction depends on reactant concentrations, the rate of a second-order reaction does not depend on reactant concentrations
3. The rate of a first-order reaction depends on reactant concentrations, the rate of a second-order reaction depends on reactant concentrations
4. The rate of a first-order reaction does not depend on reactant concentrations, the rate of a second-order reaction does not depend on reactant concentrations

Correct answer: The rate of a first-order reaction depends on reactant concentrations, the rate of a second-order reaction depends on reactant concentrations

Solution

In a first-order reaction, the rate depends linearly on the concentration of one reactant, while in a second-order reaction, the rate depends on the square of the concentration of one reactant or the product of the concentrations of two reactants.

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