What is the Rate of reaction? #chemistryshorts

Added: 2026-05-16

[00:00:00]What if I told you chemistry isn't just about what reacts, but how fast it happens? This is called the rate of a reaction or reaction rate. It tells us how quickly a chemical reaction takes place. In simple terms, the reaction rate measures how the concentration of substances changes over time. As a reaction happens, reactants are used up, so their concentration decreases.

[00:00:25]At the same time, products are formed, so their concentration increases.

[00:00:31]For a simple reaction where A turns into B, the rate can be expressed as follows.

[00:00:36]Rate equals negative change in concentration of A divided by change in time. And this is equal to the change in concentration of B divided by time.

[00:00:47]Here, A and B represent the concentrations of the reactant and the product, and T represents time. The negative sign is important because it ensures that the rate remains positive, even though reactants are decreasing.

[00:01:02]Reaction rates are usually measured in molarity per second, also written as M per second, or in moles per liter per second.