Exothermic Reactions 1. ΔrH Notation

The heat reaction can be given as a ΔrH value WHERE of the equation

Outside

The sign on ΔrH is WHAT since the enthalpy of the system is WHAT

The sign on ΔrH is NEGATIVE since the enthalpy of the system is DECREASING

In an exothermic reaction enthalpy is included as a WHAT

Product

Potential energy diagrams shows the potential energy of the WHAT and the WHAT of a chemical reaction

Potential energy diagrams shows the potential energy of the REACTANTS and the PRODUCTS of a chemical reaction

Reactants have more WHAT than the WHAT in an exothermic reaction

Reactants have more POTENTIAL ENERGY than the PRODUCTS in an exothermic reaction

The difference between the reactants and products is the WHAT

ΔrH

products have WHAT Ep than the reactants, therefor energy has been WHAT to the surroundings

products have LESS Ep than the reactants, therefor energy has been LOST to the surroundings