Across
- 4. enter
- 6. the starting substances in a chemical reaction
- 9. an attraction between atoms
- 11. light
- 12. let go
- 13. exit
Down
- 1. energy that comes from light
- 2. absorption
- 3. a result of a chemical reaction
- 5. any substance that has a defined composition
- 7. take in
- 8. molecule
- 10. A system of knowledge about the physical, chemical, and biological universe
- 14. the amount of matter in an object