Unit 14: Chemical Equilibrium

Goals:

  • To understand the nature of equilibrium and the difference between chemical and physical equilibrium.
  • To define the equilibrium comstant in terms of the law of mass action.
  • To write equilibrium constant expressions for both homogeneous and heterogeneous equilibria (different phases) and how to express equilibrium constants for multiple equilibria.
  • To explain the relationships between the rate constant and the equilibrium constant for a reaction. Why is the equilibrium constant a constant, and why does it vary with temperature?
  • To explain how knowing the equilibrium constant enables us to predict the direction of a net reaction towards equilibrium and to calculate equilibrium concentrations.
  • To explain the 4 factors that may affect the position of equilibrium: concentration, volume/pressure, temperature, catalyst.
  • To use LeChatelier's principle to predict the changes.

Course Goals and Essential Questions

  • How can we learn about things that are to small to see?
  • What relationships can I construct among basic concepts, skills, and understandings?
  • How can I best assess my own learning and progress?
  • How can I better use technology in my learning?
  • How can I become a better digital citizen?
  • How can I think more divergently, create, innovate?
  • How can I use my experience in chemistry to learn to think and communicate clearly, logically, and critically in preparation for college and a career?

Prior Knowledge and skills

  • Writing and balancing equations
  • Using reaction stoichiometry
  • Using molarity in calculations
  • Calculation of reaction rates and rate constants
Learning Targets Ch. 14.1 The Concept of Equilibrium; the Equilibrium Constant Q&P 14.1-14.1

Students will know and be able to.....

  1. Describe chemical equilibrium using the terms forward and reverse reactions and dynamic process.
  2. Write the equilibrium constant in terms of the equilibrium concentration of products and reactants and their respective stoichiometric coefficients for both homogenous and heterogeneous equilibria.
Learning Targets Ch. 14.2 Writing Equilibrium Constant Expressions Q&P 14.5-14.32

Students will know and be able to.....

  1. Express the relationship between Kp and Kc.
  2. Determine equilibrium constant given equilibrium concentration data.
  3. Demonstrate that if a reaction can be expressed as the sum of two or more reactions, the equilibrium constant for the overall reaction is given by the product of the equilibrium constants of the individual reactions.
Learning Targets Ch. 14.3 The Relationship Between Chemical Kinetics and Chemical Equilibrium Q&P 14.33-14.36

Students will know and be able to...

  1. Relate equilibrium constants to rate constants from chemical kinetics.
Learning Targets Ch. 14.4 What does the Equilibrium Constant Tell Us? Q&P 14.37-14.48

Students will know and be able to....

  1. Describe the relationship between reaction quotient and equilibrium constant and predict the direction a reaction will proceed to reach equilibrium.
  2. Use the concepts of equilibrium to determine concentration of all species in a solution.
Learning Targets Ch. 14.5 Factors that Affect Chemical Equilibrium Q&P 14.49-14.62

Students will know and be able to....

  1. Use Le Chátelier’s principle to describe how changing concentration, volume, pressure, or temperature will shift the reaction so that equilibrium will be maintained.
  2. Describe the effect of a catalyst has on equilibrium concentrations.

Links and Resources


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