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Product 12566

By: Jim and Julie Ealy, Retired , The Peddie School, Hightstown, NJ

The Pink & Blue: The Effect Of Concentration & Temperature on Equilibrium Demonstration Kit is an updated classic, proving the power of balance in a reversible chemical reaction. Students are then able to explain LeChâtelier's Principle.

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Demonstrate the power of balance in a reversible chemical reaction with this updated version of a classic demonstration! A solution of cobalt chloride turns from pink to blue and back again in a series of transformations as the concentrations of reactants and products and the temperature are changed. Students observe how a reaction at equilibrium responds immediately to conditions that upset its chemical balance. As students visualize the dynamic nature of equilibrium, they are able to explain in their own words how LeCh,telier's Principle works and why it makes good chemical sense. Whether you want to show only qualitative effects or to develop a more quantitative treatment with equilibrium constant examples, this demonstration is perfect for your classroom needs. Teacher Demonstration Notes included. Enough materials are provided to perform the demonstration seven times. Concepts: Equilibrium, LeCh,telier's Principle, endothermic vs. exothermic reactions. Time Required: 20 minutes Chemicals Provided: Cobalt chloride solution, hydrochloric acid, silver nitrate solution. Note: Perform this demonstration in a fume hood or well-ventilated lab.

Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Asking questions and defining problems
Planning and carrying out investigations
Analyzing and interpreting data
Engaging in argument from evidence
Obtaining, evaluation, and communicating information

Disciplinary Core Ideas

MS-PS1.B: Chemical Reactions
HS-PS1.B: Chemical Reactions

Crosscutting Concepts

Patterns
Cause and effect
Systems and system models

Performance Expectations

MS-PS1-2. Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.
HS-PS1-2. Construct and revise an explanation for the outcome of a simple chemical reaction based on the outermost electron states of atoms, trends in the periodic table, and knowledge of the patterns of chemical properties.
HS-PS1-5. Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.
HS-PS1-6. Refine the design of a chemical system by specifying a change in conditions that would produce increased amounts of products at equilibrium.