1. collide
2. collision
3. collide
4. correct orientation
5. energy
6. Chemical Kinetics
7. reactants
8. appear
9. Iron filings have a greater surface area than the nail. This exposes a greater area of contact between the reactants.
10. If the volume is decreased, the gas molecules are closer together and have a greater chance of making effective collisions.
11. enzymes
12. lower
13. energy
14. reversible
15. concentration
16. Le Chatelier
17. equilibrium
18. reduce
19. F
20. A
21. E
22. I
23. G
24. C
25. B
26. H
27. D