Answer:
The rate of the reaction is proportional to the square of the concentration of the reactant.
Explanation:
Let us assume a hypothetical reaction in which the rate determining step is the elementary reaction;
2A------> A2
The rate of reaction will be given by:
Rate= k[A]^2
Hence for a second order reaction having only one reactant, the rate of reaction is proportional to the square of the concentration of the reactant. The proportionality constant k, is known as the rate constant of the reaction.