AP Chem 5.3 Integrated Rate laws Part I

Front

What is the rate constant (k) for a first-order reaction?

Back

The rate constant (k) is a proportionality factor that relates the rate of a reaction to the concentration of reactants. For a first-order reaction, it has units of s^-1.

Front

What is the integrated rate law for a zero-order reaction?

Back

[A] = -kt + [A]₀ where [A] is the concentration at time t, k is the rate constant, and [A]₀ is the initial concentration.

Front

How does the rate of a first-order reaction change with concentration?

Back

For a first-order reaction, the rate is directly proportional to the concentration of the reactant. If the concentration doubles, the rate also doubles.

Front

What is the half-life of a first-order reaction?

Back

The half-life (t_1/2) of a first-order reaction is constant and is given by the formula t_1/2 = 0.693/k.

Front

What is the effect on the rate of a second-order reaction if the concentration of A is halved?

Back

For a second-order reaction, if the concentration of A is halved, the rate will decrease by a factor of four.

Front

What is the integrated rate law for a first-order reaction?

Back

ln([A]/[A]₀) = -kt, where [A] is the concentration at time t, [A]₀ is the initial concentration, and k is the rate constant.

Front

What is the relationship between rate constant and temperature?

Back

The rate constant (k) generally increases with an increase in temperature due to higher kinetic energy of the molecules.

Front

What is a second-order reaction?

Back

A second-order reaction is one where the rate is proportional to the square of the concentration of one reactant or the product of the concentrations of two reactants.

Front

What is the unit of the rate constant for a second-order reaction?

Back

The unit of the rate constant (k) for a second-order reaction is L/(mol·s).

Front

How do you determine the order of a reaction from experimental data?

Back

The order of a reaction can be determined by analyzing the concentration vs. time data and fitting it to the integrated rate laws.