| A | B |
|---|
| chemical reaction | process by which substances change into different substances through the breaking and forming of chemical bonds |
| reactant | substance that is changed by a chemical reaction |
| product | substance formed by a chemical reaction |
| bond energy | amount of energy needed to break a bond between two particular atoms; or the amount of energy released when a bond forms between two particular atoms |
| equilibrium | condition in which reactants and products of a chemical reaction are formed at the same rate |
| activation energy | energy input necessary to initiate a chemical reaction |
| exothermic | chemical reaction that yields a net release of energy in the form of heat |
| endothermic | chemical reaction that requires a net input of energy |
