Across
- 3. mass cannot be created of destroyed
- 6. a substance that is formed in a chemical reaction
- 7. when heat is released
- 8. are the biological substances that act as catalysts and help complex reactions occur everywhere in life
- 9. a process in which one or more substances are transformed into others
- 10. a symbolic representation of a chemical reaction
- 11. slows down a chemical reaction
Down
- 1. makes a new substance with new properties
- 2. a substance that takes part in a chemical reaction
- 4. speeds up a chemical reaction
- 5. when heat is absorbed