OBJECTIVE. Identify the reaction order from the rate law....

OBJECTIVE. Identify the reaction order from the rate law. What is the order in each reactant and the overall order for a reaction that has the following rate law? (a) rate $=k\left[\mathrm{O}_{3}\right][\mathrm{NO}]^{2}$ (b) rate $=k\left[\mathrm{NO}_{2}\right]^{1 / 2}\left[\mathrm{Cl}_{2}\right]^{2}$ (c) rate $=k\left[\mathrm{CH}_{3} \mathrm{Br}\right]\left[\mathrm{OH}^{-}\right]^{0}$

OBJECTIVE. Identify the reaction order from the rate law.
What is the order in each reactant and the overall order for a reaction that has the following rate law?
(a) rate $=k\left[\mathrm{O}_{3}\right][\mathrm{NO}]^{2}$
(b) rate $=k\left[\mathrm{NO}_{2}\right]^{1 / 2}\left[\mathrm{Cl}_{2}\right]^{2}$
(c) rate $=k\left[\mathrm{CH}_{3} \mathrm{Br}\right]\left[\mathrm{OH}^{-}\right]^{0}$

Key Concepts

Zero Order Reaction

In a zero order reaction, the rate of the reaction is independent of the concentration of one or more reactants, meaning the exponent in the rate law is zero. This indicates that a change in the concentration of that reactant does not affect the overall rate of the reaction.

Overall Reaction Order

The overall reaction order is the sum of the orders of all the individual reactants in the rate law. It provides insight into how the reaction rate as a whole is influenced by the combined effect of changes in the concentrations of all reactants.

Fractional Reaction Order

A fractional reaction order occurs when the exponent in the rate law is a fraction. This implies a more complex relationship between reactant concentration and reaction rate, often indicative of a multi-step reaction mechanism or an equilibrium process influencing the rate.

Rate Law

The rate law is an equation that expresses the rate of a chemical reaction as a function of the concentration of its reactants. It shows how the speed of the reaction depends on the concentrations of the substances involved and includes a rate constant that is characteristic for that reaction at a given temperature.

Reaction Order

The reaction order with respect to a particular reactant is determined by the exponent to which its concentration is raised in the rate law. This exponent indicates how changes in the concentration of that reactant will affect the reaction rate. For instance, an exponent of 1 means that the rate is directly proportional to the concentration of that reactant.

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