In this lesson we will explore the factors that determine the energies and rates of chemical reactions.  We will learn to calculate the energy changes that are associated with chemical reactions and we will become familiar with the collision theory of reaction rates.  We will also revisit Le Chatelier's principle and attempt to understand the behavior of systems in dynamic equilibrium based on the ideas behind the collision theory.  Finally, we will learn to calculate the concentrations of reactants and products at equilibrium using the equilibrium constant expression.

You will have completed this lesson when you can:

1. Describe the chemical reaction process using the collision theory.

2. Describe the bonding and energy changes that take place during chemical reactions.

3. Draw, label, and interpret reaction diagrams.

4. Do calculations involving amounts of chemicals and heats of reaction ( H).

5. List the factors which affect reaction rates.

6. Describe how and why the reaction rate is affected by:
    a. concentrations of reactants
    b. surface area of solid reactants
    c. temperature
    d. activation energy
    e. catalyst

7. Use the collision theory to explain how chemical equilibrium is attained.

8. Use the collision theory to explain how chemical equilibrium is altered.

9. Use the collision theory to explain the effects of the following on systems at equilibrium:
    a. change in concentrations
    b. change in temperature
    c. change in pressure
    d. competing reactions

10. Write equilibrium constant expressions for a variety of chemical reactions.

11. Calculate the numerical value of equilibrium constants given the equilibrium concentrations (or similar data).

12. Calculate the concentration of one substance at equilibrium given the concentrations of the other substances and the value of the equilibrium constant.

ASSIGNMENTS:

Find the following topics in your text and read about them:
    Reaction Rates
    Collision Theory
    Heat of Reaction ( H_rx)
    Reaction Diagrams
    Equilibrium Constants

HBPA-6: Chapter 8 section 5, Chapter 16

Practice problems in the text:
    HBPA-6: Chapter 16 exercises 2-4, 10, 29-38.