Across
- 3. a number placed in front of a chemical formula
- 4. a reaction which energy is absorded
- 7. substances in the beginning
- 9. rapid reaction
Down
- 1. cells in your body
- 2. breaks down componds
- 4. reaction that releases energy
- 5. material that increases the rate of a reaction
- 6. material that releases energy when burns
- 8. two or more element compounds combined to make substance