In every-day language, synonyms of “equilibrium” include balance, symmetry, parity, equality, and stability. These every-day words may suggest that “things have stopped – and activity is static.” While it is true the expression equilibrium in chemistry applies to the absence of changes in concentrations of reactants or products – at the molecular level, things are dynamic, not static. Here, students are introduced to the law of chemical equilibrium (once called “the law of mass action”). Changes in volume and/or pressure are examined for their respective impact on equilibrium. Students further familiarize themselves with concepts dealing with solubility and usages of the equilibrium constant (denoted as “K”).
Lesson 1 (or “Day 1”) Material
Lesson 2 (or “Day 2”) Material
- Day 2 Instructor Presentation
- Day 2 Student Handout
- Day 2 Rubric
- Read Chem 46 – Chemical Kinetics
- Read Chem 46 – Definition & Explanation
- Read Chem 46 – Law of Mass Action
Lesson 3 (or “Day 3”) Material
Lesson 4 (or “Day 4”) Material
12:48 Reaction Quotient Q and Equilibrium Constant K
6:47 Chemical Equilibria and Reaction Quotients
6:08 Chemical Equilibrium Problem Solving
Compare Contrast and Debate
Kickoff Debate Background:
- Advanced debate – students should frame an argument for or against the importance of this topic twenty years from today.
Resources Documents and Links
Notes and Notices
- Science & Engineering Practice: Construct explanations and design solutions.
- Cross-Cutting Concept: Stability and Change.