2. Definition
bond: forces that hold one atom to another in
a compound
•To break a bond requires energy to be put
in to overcome the forces of attraction
•Bond breaking is endothermic.
•To make bonds causes a release of energy.
•Bond making is exothermic.
3. Compounds have less energy (more
stable) than the substances from which
they form.
Ex: water has less energy than the
hydrogen and oxygen from which it
formed.
The energy stored in a bond is potential.
