Zero-Order Reactions

In a zero-order reaction, the rate of the reaction is independent of the concentration of the reactant. This can be seen in the differential rate law which shows how the rate of a reaction depends on the concentration of the … Read more

Second-Order Reactions

In a second-order reaction, the rate of the reaction is proportional to the square of the concentration of the reactant. This can be seen in the differential rate law which shows how the rate of a reaction depends on the … Read more

First-Order Reactions

In first-order reactions, the rate of the reaction is directly/linearly proportional to the concentration of the reactant. This can be seen in the differential rate law which shows how the rate of a reaction depends on the concentration of the … Read more

Half Life and Radioactivity Practice Problems

In these practice problems, we will work on the kinetics of radioactive reactions. Most often, in chemistry at least, you will be asked to determine the activity, quantity, the decay rate of radioactive isotopes, the time required to drop the … Read more

The Arrhenius Equation

When discussing the reaction order, we mentioned that the rate of a first- and second-order reaction depends on the concentration of the reactant. For example, the rate for a simple first-order reaction can be shown as:   A → Products … Read more

Activation Energy

A chemical reaction between two molecules occurs when they collide with proper orientation and sufficient kinetic energy. During the collision, the kinetic energy is used to stretch, bend, and ultimately break bonds, initiating the chemical reaction where new bonds and … Read more

The Half-Life of a Reaction

The half-life (t1/2) of a reaction is the time required for the concentration of a reactant to drop to one-half of its initial value. The half-life depends on the order of the reaction, and it is obtained from the corresponding … Read more

Determining Reaction Order Using Graphs

In the previous post, we talked about the integrated rate law and its use for determining the concentration of a reactant at a given time when the reaction order was provided.   Now, there are questions where the reaction order … Read more

Units of Rate Constant k

Knowing the units of the rate constant is important as it is used often for solving problems related to the rate laws.   k Units of a Zero-Order Reaction Zero-order indicates that the rate does not depend on the concentration, … Read more

How Are Integrated Rate Laws Obtained

We talked about the integrated rate laws in the previous post. Remember, they show the correlation between the concentration of reactants and time. There is a question that I got asked quite a few times when teaching the contacts and … Read more