| A | B |
|---|
| endothermic | a reaction absorbing heat energy from the surroundings |
| exothermic | a reaction giving off heat energy to the surroundings |
| open system | a reaction situation in which gases or other products may leave the confines of the apparatus |
| closed system | a reaction situation designed to contain all the products, including gases, of a reaction |
| Conservation of Mass | concept that the total mass of the reactants is the same as the total mass of the products of a reaction |
| phlogiston | false theory that a fire-like substance released during certain chemical reactions |
| Antoine Lavoisier | French scientist who disproved phlogiston theory, identified oxygen as an element, and formulated the concept of Conservation of Mass |
| pH | a scale of measurement of the acid or base nature of a substance |
| sodium bicarbonate | baking soda |
| carbon dioxide | CO2 |
| reactants | substances at the beginning of a chemical reaction |
| products | substances at the end of a chemical reaction |
