Exothermic reactions are those reactions in which heat is evolved when products are formed. In these reactions heat energy of reactants is greater than the heat energy of products. Exothermic reactions are represented by negative sign. For example, neutralization is an exothermic reaction. When an acid and a base react, salt and water are formed and a large amount of heat is evolved during this reaction.
The reactions during which heat is absorbed to perform a reaction, are known as endothermic reactions. In endothermic reactions, heat of products is greater than the heat of reactants. These reactions are represented by a positive sign. For example, melting of ice and vaporization of water.
The reactions during which heat is absorbed to perform a reaction, are known as endothermic reactions. In endothermic reactions, heat of products is greater than the heat of reactants. These reactions are represented by a positive sign. For example, melting of ice and vaporization of water.
