| A | B |
|---|
| Mole | (6.02 X 10 ^23 units of a substance) the amount of a substance = 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 in front of an element, molecule, or compound that indicates the number of moles present |
| 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, mass can neither be created nor destroyed... mass reactants=mass products |
| Law of Conservation of Energy | In a chemical reaction, energy can neither be created nor destroyed... reactants energy=products energy |
| Balanced Equation | a chemical equation in which the # of moles of each element on reactant side is equal to # 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 A + B --> AB |
| Decomposition reaction | a chemical reaction in which a compound is broken down into a simpler substance AB --> A + B |
| Single-replacement reaction | a chemical reaction in which a metal replaces a metal OR a metal replaces a non-metal within a compound... A + BC --> AC + B |
| Double-replacement reaction | a chemical reaction in which a metal relplaces a metal AND a nonmetal replaces a nonmetal within two compounds; 2 compounds "trade" elements... AB + XY --> AY + XB |
| 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 |
