Example of endothermic reaction take place inside the engine of motors vechiles
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A chemical reaction involves the conversion of reactant molecules to products. This conversion requires cleavage of old chemical bonds and the formation of new chemical bonds in the molecule. All chemical bonds have certain strength and require some energy for dissociation. This energy is provided by collision between reactant molecules or by external heating. Similarly the formation of chemical bonds releases some energy. The overall change in energy during a chemical reaction is known as heat of reaction. It is denoted by 'ΔHΔH' and expressed in Kj/mol.
On the basis of energy change, chemical reactions can be classified as endothermic and exothermic reaction. Exothermic reactions can be defined as the reaction in which energy is released in the form of heat. For such reaction, the energy level of products is less compared to reactant molecules. Therefore the value of ΔHΔH is a negative quantity. For example combustion is an exothermic reaction in which energy is released in the form of heat. Unlike exothermic reaction, in an endothermic reaction the energy is absorbed in the form of heat. Let’s discuss some other aspects of endothermic reactions with appropriate examples.