Chem 331 Worksheet 9 - Iowa State University

Radical Chlorination,
Equilibrium, and Degrees of
Unsaturation
Supplemental Instruction
Iowa State University
Leader: Eric
Course: Chem 331
Instructor: Dr. Trahanovsky
Date: February 14, 2011
1. Write two possible termination steps for the light induced radical chlorination of methane
2. Write the equilibrium constant for the following chemical equation:
K eq =
CH 2 =CH 2 + HBr
CH 3 CH 2 Br
3. The K eq value for this reaction is equal to 7.1 x 10 7 . What does this mean for the products and
the reactants of the reaction?
4. Define /explain/illustrate the difference between:
a. Exergonic and endergonic:
b. Reaction rate and equilibrium position:
c. Intermediate and transition state:
d. A fast reaction and a slow one:
Supplemental Instruction
1060 Hixson-Lied Student Success Center 294-6624 www.si.iastate.edu

e. What can be used to make a reaction faster or slower? When it is used, which is
changed: the rate or the equilibrium position?
5. What is the average bond dissociation energy in kcal/mol?
6. Draw an energy diagram for a reaction that is exergonic and has two intermediates.
a. Label the axes.
b. Label the products, reactants, intermediates, transition states, the first ΔG ‡ , and ΔG o .
c. How many transition states are there?
7. How many degrees of unsaturation do the following molecules have? List the possible
structures that each molecule could contain and draw an example.
a. C 7 H 12
b. C 4 H 5 N
c. C 10 H 16 O
d. C 7 H 6 Br 2 Cl 2
Supplemental Instruction
1060 Hixson-Lied Student Success Center 294-6624 www.si.iastate.edu