| Across |
| 3. |
Needed to break bonds |
| 6. |
absorbes heat |
| 10. |
When two or more elements mix together |
|
|
| Down |
| 1. |
A source of energy |
| 2. |
a substance that takes part in and undergoes change during a reaction |
| 4. |
Joined by a chemical reaction |
| 5. |
A process in which a chemical substance changes because of the addition of oxygen |
| 7. |
releases heat |
| 8. |
Substance reacts with oxygen and gives off heat |
| 9. |
To separate |
|
