| A | B |
| Acid | Any substance that increase H+ ion concentration |
| Atom | Smallest particle of an element |
| Base | Decreases H+ ion concentration |
| Electrolyte | Substance that dissociates in solution to form ions |
| Element | Substance that cannot be broken down |
| Ion | Atom that has become electrically charged |
| Lipid | Water-insoluable, organic |
| Protein | Organic Compound composed of amino acids |