Classroom Resources: Equilibrium
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Establishing Equilibrium, Equilibrium Constants, Reaction Quotient, Graphing  High School
Activity: Shaking Dice to Model Equilibrium Principles
In this activity, students work together in small groups using a variety of multisided dice to model the dynamic character of a chemical equilibrium. Students will collect, share and analyze data in order to understand that the rate of a chemical reaction depends on the concentration of reactants (and products) as modelled by the different sided dice.

Solubility, Concentration, Conductivity, Stoichiometry, Equilibrium Constants  High School
Lab: Experimental Determination of the Solubility Product Constant for Calcium Hydroxide
In this lab, students will predict and measure the relationship between the conductivity of a solution of calcium hydroxide and the mass of substance added to it. From the relationship, students will determine solubility and Ksp of calcium hydroxide. Ksp will be calculated using the molar concentration of ions in the solution and the equilibrium expression for the dissociation of calcium hydroxide.

Separating Mixtures, Covalent Bonding, Concentration, Review, Ionic Bonding, Culminating Project, Percent Composition, Redox Reaction, Calorimetry, Titrations, Indicators, Le Châtelier's Principle, Half Reactions, Beer's Law, Buffers, Enthalpy, Conductivity, Mixtures, Alloys, pH  High School
Lesson Plan: AP Chemistry Experimental Evidence Review
In this lesson, students will evaluate data from 16 simulated lab experiments that were designed to mirror the Recommended Labs from the College Board. Corresponding lab experiments and demonstration options have also been included for teacher reference.

Solubility, Entropy, Le Châtelier's Principle, Gibb's Free Energy , Equilibrium Constants, Enthalpy  High School
Lesson Plan: Relationship Between Free Energy and the Equilibrium Constant
In this lesson, students will explore the relationships between solubility and Keq (specifically Ksp), as well as Keq and ΔG°. First, a guided inquiry activity will introduce the relationship between standard free energy and equilibrium constant with the equation ΔG° = RTlnKeq. Then data collection regarding solubility of potassium nitrate at various temperatures will lead to the calculation of Ksp and ΔGo for the dissolution reaction at those temperatures. Students will manipulate the equations ΔG° = RTlnKeq and ΔG° = ΔH°  TΔS° to derive a linear relationship between 1/T and lnKeq, which will then be graphed to determine values for ΔH° and ΔS°.

Le Châtelier's Principle, Establishing Equilibrium, Equilibrium Constants, Reaction Quotient  High School
Activity: Le Châtelier's Principle Particulate View
In this activity, students will gain a better understanding of how applying a stress to a reaction system will shift the equilibrium. The students will be able to predict the direction a reversible reaction will shift based of the value of the reaction quotient (Q) and the equilibrium constant (K). This activity should be completed after students have completed the activity “Equilibrium Particulate View.”

Establishing Equilibrium, Equilibrium Constants, Reaction Quotient  High School
Activity: Equilibrium Particulate View
In this activity, students will gain a better understanding of what it means for a reaction to be in a state of equilibrium and how a reaction progresses over time to establish equilibrium. Students will also relate the equilibrium constant to the amount of products and reactants present at equilibrium.

Le Châtelier's Principle, Establishing Equilibrium  High School
Lab: A Greener Le Châtelier’s Principle Lab
In this lab, students will explore Le Châtelier’s Principle using nontoxic materials, while still visualizing the equilibrium shifts through color changes. Traditionally, equilibrium experiments and Le Châtelier’s Principle are illustrated using chemicals that undergo color changes as the equilibrium position shifts such as cobalt (IV) chloride and iron (III) thiocyanate. While these reactions effectively demonstrate Le Châtelier’s Principle, they utilize reagents that are toxic.

Le Châtelier's Principle, Establishing Equilibrium, Equilibrium Constants, Reaction Quotient  High School
Lesson Plan: Equilibrium Unit Plan
The AACT high school classroom resource library and multimedia collection has everything you need to put together a unit plan for your classroom: lessons, activities, labs, projects, videos, simulations, and animations. We constructed a unit plan using AACT resources that is designed to teach equilibrium to your students.

Le Châtelier's Principle, Equilibrium Constants, Reaction Quotient  High School
Lesson Plan: Q, K, and Le Chatelier
In this lesson students practice applying Q vs K as an explanatory tool in a simulation and demonstration. In both activities, students will consider how a change in concentration of one species subsequently effects all the species as equilibrium is reestablished.

Catalysts, Entropy, Equilibrium Constants, Enthalpy, Activation Energy, Energy Diagrams, Reaction Quotient, Spontaneous vs. Nonspontaneous Reactions  High School
Lesson Plan: Making Connections in Kinetics, Equilibrium and Thermochemistry
In this lesson students will understand the connections between the equilibrium constant (K) and the reaction quotient (Q) as well as how they determine the favorability of a reaction. Additionally students will be able to determine if a reaction is kinetically favored or thermodynamically favored.

Le Châtelier's Principle, Equilibrium Constants, Reaction Quotient  High School
Activity: Equilibrium in a Beaker
In this activity, students will model equilibrium reactions using plastic chips to represent atoms. The goal of the lesson is to connect the symbolic model of an equilibrium reaction to its particle model.

Reaction Rate, Exothermic & Endothermic, Le Châtelier's Principle, Hess's Law, Activation Energy  High School
Lab: Kinetics and Equilibrium
In this lab, students will investigate the reaction of the hydrogen sulfite ion (HSO3) and the iodate ion (IO3) to determine the effect that changing concentration and temperature has on the reaction rate.

Le Châtelier's Principle, Establishing Equilibrium, Equilibrium Constants, Reaction Quotient  High School
Lesson Plan: Discovering Equilibrium
In this lesson students manipulate sets of given conditions to discover what equilibrium is, and how the equilibrium is established from different starting conditions. Students then refer back to the activity as the foundation framework for the rest of Essential Knowledge 6.A, 6.B.1 and 6.B.2. This lesson focuses on both a qualitative and quantitative understanding of equilibrium.

Le Châtelier's Principle, Establishing Equilibrium  High School
Activity: Simulation Activity: Predicting Shifts in Equilibrium: Q vs K
In this simulation, students will take a 15 question quiz. Each quiz questions has two parts. The first part requires the student to calculate the value of the reaction quotient, Q. In the second portion of the question, the students will compare the value of Q to the equilibrium constant, K, and predict which way the reaction will shift to reach equilibrium. The simulation includes five different reactions which each have three scenarios: Q > K, Q = K, and Q < K.

Le Châtelier's Principle, Establishing Equilibrium  High School
Simulation: Predicting Shifts in Equilibrium: Q vs K
In this simulation, students will take a 15 question quiz. Each quiz question has two parts. The first part requires the student to calculate the value of the reaction quotient, Q. In the second portion of the question, the students will compare the value of Q to the equilibrium constant, K, and predict which way the reaction will shift to reach equilibrium. The simulation includes five different reactions which each have three scenarios: Q > K, Q = K, and Q < K.

Establishing Equilibrium  High School
Activity: Equilibrium Introduction
In this activity, students perform a handson activity that models chemical equilibrium based on the article Equilibrium: A Teaching/Learning Activity by Audrey H. Wilson from the Journal of Chemical Education, Vol. 75, No. 9, September 1998.

Concentration, Reversible Reactions, Le Châtelier's Principle  High School
Lab: Le Chatelier’s Soda
In this lab, students will observe how the equilibrium of a chemical reaction is affected when a change in pressure, temperature, and concentration is applied to the system.

Establishing Equilibrium  High School
Animation: Equilibrium Animation
In this animation, students will visualize equilibrium with the help of water and a piece of chalk (calcium carbonate). **This video has no audio**

Heat, Temperature, Exothermic & Endothermic, Le Châtelier's Principle, Establishing Equilibrium, Equilibrium Constants, Reaction Quotient  High School
Demonstration: Le Châtelier’s Principle
In this demonstration, students will witness a system at equilibrium and apply different stresses to see how the equilibrium shifts.

Heat, Temperature, Exothermic & Endothermic, Activation Energy, Le Châtelier's Principle, Establishing Equilibrium, Equilibrium Constants, Reaction Quotient  High School
Activity: Reversible Reactions Simulation
In this activity, students will investigate how temperature, activation energy, initial amounts of products and reactants, and type of reaction (exo or endothermic) effect the equilibrium position of a reaction using a simulation.

Observations, Chemical Change, Chemical Change, Reaction Rate, Acid Base Reactions, Limiting Reactant, Chemical Change, Indicators, Le Châtelier's Principle  High School
Demonstration: Milk of Magnesia Magic
In this demonstration, students will observe a color change in a milk of magnesia solution as vinegar is added.

Reaction Rate, Reversible Reactions, Le Châtelier's Principle, Establishing Equilibrium, Equilibrium Constants, Graphing  High School
Lab: Dynamic Equilibrium Simulation
In this lab, students will explore equilibrium using paper clips to mimic a chemical reaction.