| A | B |
|---|
| A compound or an element | Pure Substance |
| cannot be broken down. | Element |
| Two or more elements chemically combined | Compound |
| Mixed but not chemically combined | Mixture |
| Takes the best characteristics from each substance. | Composite |
| Mass is neither gained nor lost. | Conservation of Mas |
| A liquid is split with an electric curent. | Electrolysis |
| The most common element in the universe | Hydrogen |
| The most common element in the Earth's crust | Oxygen |
| A new substance is formed. | Chemical Change |
| No new substance is formed. | Physical Change |
| Matter can escape this system. | Open System |
| Matter can't escape this system. | Closed System |
