| A | B |
| Exothermic | gives off heat energy |
| Endothermic | requires heat energy |
| Synthesis | the atoms of two or more substances are arranged to form a compound a+b->ab |
| Decomposition | Reaction occurs when the molecules of a compound break down |
| Single Replacement Reaction | Occurs when a combined element is replaced by an uncombined element |
| Double Replacement Reaction | occurs when elements in different compounds replace each other or exchange |
| Neutralization | a type of double replacement in which an acid and a base exchange ions |
| Law of the Conservation of Mass | total mass of reactants equal to the total mass of the product |