Concept preview

What you will be able to do

1. 01Define reaction rate and identify the factors affecting it.
2. 02Derive and use rate laws to determine reaction rates from experimental data.
3. 03Understand the relationship between reaction mechanisms and rate laws.
4. 04Interpret and analyse graphical representations of reaction rates.

The reaction rate is a fundamental concept in chemical kinetics, representing how quickly a chemical reaction proceeds. It is crucial for understanding how chemical processes occur in both natural and industrial settings. Mathematically, the rate of a reaction is defined as the change in concentration of a reactant or product per unit time. This can be expressed as $-\frac{d[\text{A}]}{dt}$ for a reactant $A$, where the negative sign indicates that the concentration of a reactant decreases over time. Conversely, for a product, the rate is expressed as $\frac{d[\text{B}]}{dt}$, where $B$ is a product. Reaction rates are typically measured in units of molarity per second (M/s). Understanding reaction rates allows chemists to control reactions to optimize yields and minimize by-products.