CHEM 1211 Sample Module Nine Exam Name:_______________

Module Nine: Chemical Kinetics Chapter 15

_________(10) A. Law of Mass Action

_________(10) B. Factors Forming Rate Constant k’

_________(10) C. Key Terms Chapter 15

_________(20) D. Determination of Rate Orders from Lab Data

_________(20) E. Mechanism of Reaction

_________(05) F. Discussion Question Chapter 15

_________(10) M. Multiple Choice Applications Chapter 15

_________(85) Module Nine Total

Part A: Law of Mass Action 10 points

In the reaction: A + B à C + D ; assuming the reaction is first order with respect to both the reactants A and B; the rate expression is: Rate = k’[A][B]. The reverse reaction is not a factor in the initial concentration changes. Demonstrate the Law of Mass Action in explaining why you multiple the concentrations A times the concentration of B in the rate expression

( [A][B] ) . What does this product represent? Is this product a number greater or less than one?