Across
- 3. A system in which no matter can enter or escape
- 5. A system in which matter can enter from or escape.
- 8. What you start with in a chemical equation.
- 9. Substance that slows or stops a chemical reaction
- 10. What you end up with after a chemical reaction
- 11. When compounds break down into simpler substances.
Down
- 1. When one element replaces another in a compound
- 2. Substance that speeds up a chemical reaction
- 4. A chemical reaction where energy is released
- 6. A chemical reaction where energy is absorbed
- 7. When two or more compounds combine to make a more complex substance.