Endothermic & Exothermic Reactions Created by: Mrs. Dube

Endothermic reactions Endothermic reactions absorb energy Endothermic reactions often produce a decrease in temperature; you end up with less energy The bond energies of the reactants are greater than the products Photosynthesis is an endothermic reaction; energy from the sun is absorbed

Exothermic Reactions Exothermic reactions release energy Exothermic reactions often produce an increase in temperature; extra energy is released The bond energies of the reactants (what you start with) are less than the bond energies of the products (what you end up with) All combustion reactions are exothermic

Supplying Energy Exothermic and endothermic reactions work together to supply energy Exothermic Reactions: Reactants  Products + Energy   Endothermic Reactions: Reactants + Energy  Products

How do exothermic reactions differ from endothermic reactions? Quiz Quickie How do exothermic reactions differ from endothermic reactions? Give an example of an exothermic reaction you may have encountered in your daily life. What endothermic reaction do we rely upon to provide us with the oxygen we breathe?