Unit 5: Kinetics

5. an expression that describes the rate of change of the reactants in terms of their concentration
7. a _____________________ distribution graph that shows the probability distribution of particle speed for a given temperature
8. _____________ order reactions have rate constants with units 1/s.
11. the spontaneous decomposition of an unstable nucleus
15. an elementary step involving two molecules
17. the particular arrangement of elementary steps to produce a specific overall reaction
18. reactions that are composed of a single step that comprise more complex reactions
20. the elementary step that describes the rate law of a reaction.

1. the change in concentration of a reactant or product per unit time
2. time required for some quantity to reduce its size by 50%
3. a chemical species that is created and used in a single complex reaction
4. positive change in enthalpy, thermal energy is absorbed into a system
6. a measurement of the total heat in a system
9. a species formed in a chemical reaction; found on the right of the arrow in a chemical equation
10. the amount of energy required to produce a reaction
12. a chemical species that enables a reaction to proceed at an increased rate
13. negative change in enthalpy, thermal energy is released into a system
14. an elementary step involving a single molecule
16. ______________ theory states that atoms must collide at the correct orientation with enough energy to react
19. a substance that is consumed in a chemical reaction; found on the left of the arrow in a chemical equation