| A | B |
|---|
| checmical change | a change that produces one or more substances that differ from the original substances |
| physical change | a change in which the apperance of a substance changes but the properties stay the same |
| energy level | one of the spaces around the nucleus of an atom in which an electron moves |
| ion | an atom that has either a positive or a negative charge |
| chemical bond | the attractive force that holds atoms together |
| chemical formula | a way to write the kinds and numbers of atoms in a compound |
| subscript | a number in a formula that tells the number of atoms of an element in a compound |
| radical | group of two or more atoms that acts like one atom |
| acid | a compound that reacts with metals to produce hydrogen |
| base | a compound that contains the gydroxyl (OH) radical |
| indicator | a substance that changes color when in an acid or a base |
| ph | a number that tells whether a substance is an acid or a base. |
