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Product 12560

By: Walter Rohr, Retired, Eastchester High School, Eastchester, NY

The Demonstrate Phase Changes of Carbon Dioxide Chemical Equilibrium Demonstration Kit is an ingenious idea to introduce phase diagrams and triple point using dry ice. Using a unique device, all three phases of CO2 can be easily and safely observed.

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Product Details

An ingenious idea to introduce and demonstrate phase diagrams and triple point using dry ice. At atmospheric pressure, carbon dioxide exists only as a solid or gas. However, in a closed system, liquid carbon dioxide will exist when the pressure exceeds 5 atmospheres. The triple point is when all three states of carbon dioxide (solid, liquid and gas) are simultaneously present in a closed system.

Using a unique device called a Triple Point of CO2 Apparatus, all three phases of CO2 can now be easily and safely observed. The apparatus comes with a large pressure gauge to monitor the pressure changes in the apparatus. This is a terrific lab activity with detailed instructions and teaching notes.

Concepts: Equilibrium, phase diagrams, triple point, sublimation.
Time Required: 20 minutes
Materials Provided: Triple point of CO2 apparatus.
Note: Dry ice is required but not provided.

Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Developing and using models

Disciplinary Core Ideas

MS-PS1.A: Structure and Properties of Matter
MS-PS3.A: Definitions of Energy
HS-PS1.A: Structure and Properties of Matter
HS-PS2.B: Types of Interactions
HS-PS3.A: Definitions of Energy
HS-PS3.B: Conservation of Energy and Energy Transfer

Crosscutting Concepts

Scale, proportion, and quantity
Systems and system models
Energy and matter

Performance Expectations

MS-PS1-4: Develop a model that predicts and describes changes in particle motion, temperature, and state of a pure substance when thermal energy is added or removed.
HS-PS3-2: Develop and use models to illustrate that energy at the macroscopic scale can be accounted for as a combination of energy associated with the motion of particles (objects) and energy associated with the relative position of particles (objects).
HS-PS3-4: Plan and conduct an investigation to provide evidence that the transfer of thermal energy when two components of different temperature are combined within a closed system results in a more uniform energy distribution among the components in the system (second law of thermodynamics).