| A | B |
|---|
| Thales | The origin of the Earth could be explained by natural phenomena. |
| Aristotle | Added the "fifth element", the aether to explain the heavens. |
| Robert Boyle | Wrote "The Skeptical Chymist" and laid the foundations for modern chemistry. |
| Joseph Priestly | Discovered "improved air" |
| Antoine Lavoisier | The Law of Conservation of Mass, Oxygen is an element. |
| John Dalton | The Modern Atomic Concept, The Law of Multiple Proportions |
| Joseph Proust | The Law of Definite Proportions |
| Joseph Gay-Lussac | If mass and volume of a gas are held constant, the pressure of a gas will increase as temperature increases. |
| Amedeo Avogadro | The Mole Concept |
| Michael Faraday | Developed the concept of electrolytes and non-electrolytes. invented the electric motor and electric generator., |
| Frederich Wohler | first to make an organic compound in the laboratory |
| Adolph Kolbe | Because proficient at "synthesizing" organic compounds when most chemists still believed it couldn't be done. |
