Across
- 7. The minimum energy needed to start a reaction
- 9. More of this exposed area makes reactions faster
- 11. A biological catalyst
- 12. A weak mixture with fewer particles
- 13. A small‑size form that reacts quickly
- 14. The total area exposed for reacting
- 16. A helper that speeds up a reaction without being used up
- 18. Mixing that helps particles collide more
- 19. Tiny pieces that must collide to react
- 20. A starting substance in a reaction
- 21. Adding this usually speeds up reactions
- 22. Needed for particles to react
- 24. What happens when conditions decrease reaction rate
Down
- 1. How often particles collide
- 2. In gases, more of this means more collisions
- 3. A substance formed after a reaction
- 4. Another word for reaction rate
- 5. When particles bump into each other
- 6. A combination of substances not chemically joined
- 8. More particles in the same space
- 10. Higher levels of this make particles move faster
- 15. How fast a chemical reaction happens
- 17. What happens when conditions increase reaction rate
- 23. A state of matter where pressure changes matter most