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A zero order reaction is a reaction in which the rate is independent of the concentration of reactants. This means that the rate law of a zero order reaction is rate = k. I believe the reaction 2NH3 (g) --> N2 (g) + 3H2 (g) is a zero order reaction because the rate does not depend on the concentration of ammonia.
A zero order reaction is one where changing the concentration of your reactants does not change the initial rate of the reaction, meaning that your reaction rate is independant of that reactant. Zero order reaction K values will have M/s units.
Zero order reactions are reactions in which the rate of the reaction only depends on the rate constant, not the concentration of reactant. The book gives an example, which is the reaction 2 NH3(g) --> N2(g) + 3 H2(g). Experiments show that no matter the initial concentration of NH3, the reaction always proceeds at the same rate.
Professor Lavelle gave an example of zero order reactions as a saturated catalyst reaction, therefore the rate of reaction is no longer dependent on the concentration of the reactants but rather on the speed at which catalysts can interact with the reactants.
A zeroth-order reaction has a rate that does not depend on the concentration of the reactant. This is commonly observed in enzyme-catalyzed reactions when the enzyme is saturated with the substrate and increasing the substrate has no effect on the rate of the reaction since there are no more enzymes to bind to the substrates. Therefore, the rate of the reaction is constant.
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