| A | B |
| Atomic Mass Unit | 1u is the relative mass compared to hydrogen. |
| Avogadro’s Hypothesis | That all gases at STP contain the same number of particles. |
| Avogadro’s number | The number of particles in exactly one mole of pure substance. |
| Diatomic | A molecule that contains two atoms. |
| Ideal Gas Model | An imaginary gas that behaves perfectly according to the Kinetic Theory. |
| Kinetic Molecular Theory | Statements of how ideal gases behave at standard temperature and pressure. |
| Molar Mass | The mass in grams of one mole of pure substance. |
| Mole | The same number of particles as is the amount of a substance that contains the same number of particles as the number of atoms in exactly 12g of carbon 12. |
| Relative Mass | The mass on an element as compared to the same element in a different amount. |
| STP | Is the conditions where there is 1 atm of gas at 0C. |