| A | B |
|---|
| matter | anything that has mass and takes up space |
| exothermic reaction | a reaction that releases energy in the form of heat |
| endothermic reaction | a reaction in which energy is absorbed |
| precipitate | a solid formed from a solution during a chemical reaction |
| chemistry | study of the properties of matter and how matter changes |
| chemical equation | short, easy way to show a chemical reaction using symbols instead of words |
| reactant | substances at the beginning of a reaction |
| product | the substances at the end of a reaction |
| conservation of mass | during a chemical reaction, matter is not created or destroyed |
| open system | system where matter can enter from or escape to the surroundings |
| closed system | matter is not allowed to enter of leave |
| coefficient | a number placed in front of a chemical formula in an equation |
| synthesis | when two or more elements or compounds combine to make a more complex substance |
| decomposition | breaks down compounds into simpler products |
| replacement | one element replaces another in a compound, or when two elements in different compounds trade places |
