Loading....
Coupon Accepted Successfully!

 

Endothermic and Exothermic Reactions

The change in heat for chemical reactions at constant pressure is called enthalpy change, denoted by ΔH. The change in enthalpy (ΔH) of a reaction is represented as shown below:
 
ΔH = Hproducts – Hreactants
 
If the reaction is endothermic, the change in enthalpy is positive. In an endothermic reaction, the enthalpy of the reactants is less than the enthalpy of the products. So the reaction is accomplished by supplying energy to the reaction. On the other hand, the change in enthalpy is negative if the reaction is exothermic. Energy is released in this case. Also it is worth remembering that in an exothermic reaction, the enthalpy of the reactants is greater than the enthalpy of the products. Hence, if we have the enthalpy data, we can predict whether the reaction is endothermic or exothermic.





Test Your Skills Now!
Take a Quiz now
Reviewer Name