AP Chemistry 5.1-5.3 Rate Laws

Front

What is a rate law in chemistry?

Back

A rate law is an equation that relates the rate of a chemical reaction to the concentration of its reactants, typically expressed as Rate = k[A]^m[B]^n, where k is the rate constant, and m and n are the orders of the reaction with respect to reactants A and B.

Front

What does the rate exponent indicate in a rate law?

Back

The rate exponent indicates the order of the reaction with respect to a particular reactant, showing how the rate of reaction changes with changes in the concentration of that reactant.

Front

How do you determine the overall order of a reaction?

Back

The overall order of a reaction is determined by summing the individual orders of all reactants in the rate law.

Front

What is the significance of a zero-order reaction?

Back

In a zero-order reaction, the rate of reaction is constant and does not depend on the concentration of the reactants.

Front

What is a first-order reaction?

Back

A first-order reaction is one where the rate is directly proportional to the concentration of one reactant, meaning if the concentration doubles, the rate also doubles.

Front

What is a second-order reaction?

Back

A second-order reaction can either involve one reactant raised to the second power or two reactants each raised to the first power, resulting in a rate that is proportional to the square of the concentration of one reactant or the product of the concentrations of two reactants.

Front

How can you experimentally determine the order of a reaction?

Back

The order of a reaction can be determined by analyzing the change in reaction rate as the concentration of reactants is varied, often using methods like the method of initial rates.

Front

What is the rate constant (k) in a rate law?

Back

The rate constant (k) is a proportionality factor that is specific to a particular reaction at a given temperature and is influenced by factors such as temperature and the presence of catalysts.

Front

What is the effect of temperature on the rate constant (k)?

Back

Generally, an increase in temperature results in an increase in the rate constant (k), leading to a faster reaction rate.

Front

What is the relationship between concentration and reaction rate in a second-order reaction?

Back

In a second-order reaction, if the concentration of a reactant is doubled, the rate of reaction increases by a factor of four.