| A | B |
|---|
| Subscript | # of atoms in a molecule (small #) |
| Chemical Equation | abbreviated way to show a chemical reaction |
| Major Parts of a Chemical Reaction | Products, Reactants |
| Coefficient | # of molecules in a chemical formula (# in front) |
| # of Oxygen atoms in 4H2O | 4 |
| # of Hydrogen atoms in 4H2SO4 | 8 |
| # of Mg atoms in MgO | 1 |
| # of Carbon atoms in 2NaHCO3 | 2 |
| Chemical Change | molecules break apart and/or rearrange to form new sustances |
| Physical Change | molecules keep the same arrangment of atoms and no new substance forms |
| Examples of Physical Changes | Dissolving salt, Evaporating Water, Ripping a Piece of Paper, Crushing a ping pong ball |
| Examples of Chemical Changes | Electrolysis, baking a cake, burning a candle, rotting food |
| Precipitate | Solid formed in a chemical reaction |
| Signs of a Chemical Reaction | Light, Change in Temperature, new odor, making a new solid or gas |
