| A | B |
|---|
| law of conservation of mass | during a chemical reaction, matter is neither created nor destroyed |
| open system | matter can enter from or escape to the surroundings |
| closed system | matter cannot enter or leave |
| coefficient | a number placed in front of a chemical formula in an equation |
| synthesis, decomposition, replacement | three types of chemical reactions |
| synthesis | when 2 or more elements or compounds combine to make a more complex substance |
| decomposition | when compounds break down into simpler products |
| replacement | when 2 elements in different compounds trade places or replace each other |
| chemical equation | a way to show chemical reactions using symbols instead of words |
| product | reactant + reactant = |
