Chemical Kinetics

4. The time it takes for the reactant concentration to drop to half of the initial concentration
5. a factor appears in the Arrhenius equation, and is related to both the collision frequency of the reactants and the orientation of the molecule at the time of collision.
7. the minimum energy required to initiate a chemical reaction
9. a state spotted the high point on the diagram
15. A substance that changes the speed of a chemical reaction without undergoing a permanent chemical change itself
16. The site of the enzyme where the catalysis occurs
18. the number of molecules present in an elementary step
19. a species which appears in an elementary step which is not a reactant or product
21. A substance that speeds up a biochemical reaction but is not shown in the overall chemical reaction
22. the reaction that if doubling the concentration causes an 2^2 increase in rate
26. the limit value of the average rate when the time interval △t tends to zero

1. a step-by-step detailed description of a chemical reaction
2. the average value of the change in the concentration of a substance over a period of time
3. the molecularity of the reaction 2N2O(g) → 2N2(g)+O2(g)
6. measured by the change in concentration with time.
8. its total value is 2 in the equation v = k[A][B]
10. the substance present at the transition state
11. the reactant in the reaction catalyzed by the enzyme
12. Reactions under this condition are limited by the area of contact of the reactants
13. determination of the proportions (by weight or number of molecules) in which elements or compounds react with one another
14. a coefficient in the rate equation, which is independent of the concentration of reactants, and its value can be determined experimentally
17. Involving either all gases or all liquids
20. any process that occurs in a single step
23. the study of how fast chemical reactions occur.
24. a type of RNA based enzyme which can catalyze the cleavage of other RNA
25. molecules approach to each other and generate strong effects