The Relation Between Reactant Concentration and Time Review Questions 13.21 Write an equation relating the concentration of a re- actant A at t = 0 to that at t = t for a first-order re- action. Define all the terms and give their units. Do the same for a second-order reaction. 13.22 Define half-life. Write the equation relating the half- life of a first-order reaction to the rate constant. 13.23 Write the equations relating the half-life of a second- order reaction to the rate constant. How does it differ from the equation for a first-order reaction?

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