| A | B |
|---|
| Mole | a quantity of 6.02 x 1023 units of a substance; the amount of a substance equal to the sum of the atomic masses in grams; Avogadro’s number |
| Formula mass (FM) | the sum of the atomic masses of a substance in a.m.u. |
| Gram formula mass (GFM | the sum of the atomic masses of a substance in grams |
| Coefficient | the integer that appears in front of an element |
| Subscript | the integer to the lower right of an element which indicates the number of atoms present in the compound |
| Species | the individual products and reactants in a chemical reaction |
| Law of conservation of mass | in any chemical reaction |
| Law of conservation of energy | in any chemical reaction |
| Balanced equation | a chemical equation in which the number of moles of each element on the reactants side is equal to the number of moles of each element on the products side |
| Synthesis reaction | a chemical reaction in which two or more substances combine to form a compound |
| Decomposition reaction | a chemical reaction in which a compound is broken down into simpler substance |
| Single-replacement reaction | a chemical reaction in which a metal replaces a metal |
| Double-replacement reaction | a chemical reaction in which a metal replaces a metal AND a nonmetal replaces a nonmetal within two compounds; two compounds “trade” elements |
| Molecular formula | formula for a compound which provides the number and identity of the atoms of each element present |
| Empirical formula | formula for a compound which provides the simplest ratio of the elements present |
| Percent mass | % composition by mass = mass of part/mass of whole x 100 |
