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.