# Rate of a Chemical Reaction

Rate is defined as the change in the amount of the substance or concentration of the substance with respect to time.

$$RATE\text{ }=\text{ }\frac{\left[ Concentration \right]}{Time}$$.

Let us consider a general reaction,

Reactants → Products

During the progress of a chemical reaction,

Concentration of the reactants are decreases with time and concentration of products increases with time.

The following image shows diagrammatic representation of RATE OF REACTION.In above chemical reaction,

• Represents the REACTANT molecules
• Represnts the PRODUCT molecules

Rate of a reaction for chemical reactions,

$$RATE=-\frac{[\operatorname{Re}ac\tan ts]}{Time}=+\frac{[products]}{Time}$$.

UNITS OF RATE OF REACTION:

Units = Concentration.time¯¹

= Mole.Lit¯¹.time¯¹

= Mole.dm¯³.time¯¹

Time can be expressed in terms of Years, Months, Days, Hours, Minutes, and Seconds.