1. Endothermic & Exothermic Reactions
Created by:
Mrs. Dube

2. 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

3. 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

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

5. 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?