| A | B |
|---|
| atom | basic unit of all matter |
| protons | positively charged subparticles in atoms |
| neutrons | found in the nucleus of an atom without charge |
| electrons | negatively charged particles that orbit around the nucleus |
| chemical bond | force that holds 2 or more atoms together |
| covalent bond | electrons are shared |
| ionic bond | electrons are gained or lost |
| O | chemical symbol for oxygen |
| N | chemical symbol for nitrogen |
| H | chemical symbol for hydrogen |
| C | chemical symbol for carbon |
| pH | indicates whether a substance is an acid or base |
| less than 7 | acids |
| bases | pH is more than 7 |
| atomic number | number of protons in an atom |
| atomic mass | total number of protons & neutrons in an atom |
| nucleus | location of protons & neutrons in an atom |
| orbits | location of electrons in an atom |
| valence number | number of electrons in the outer orbit |
| lewis structure | shows the symbol + the valence electrons |
| structural formula | indicates the atoms and their arrangement |
| molecular formula | shows the atom types & the number of each |
| element | made up of only 1 type of atom |
| compound | substance formed by the bonding of 2 or more different types of atoms |
| mixture | composed of 2 or more types of atoms NOT chemically combined |
| solution | mixture in which the molecules are evenly distributed |
| suspension | mixture of water and non dissolved materials |
| solute | what is being dissolved |
| solvent | what is doing the dissolving |
| hydrogen ions (H+) | causes an acid |
| hydroxide ions (OH) | causes a base |
| neutral | equal number of H+ and OH- ions |
| dissociate | means that a molecule is breaking apart |
