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Product 12884

By: The Flinn Staff

With the It’s Just a Phase Heating and Cooling Curves Thermodynamics Laboratory Kit, students measure heating and cooling curves to identify an unknown solid. Students investigate the solid–liquid phase changes and determine the energy changes that occur.

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It seems counterintuitive—when freezing weather is predicted, orange growers spray the trees with water to prevent the fruit from freezing! The water actually releases heat when it solidifies. The purpose of this experiment is to investigate the solid–liquid phase changes for an unknown organic solid and determine the energy changes that take place when a solid melts or a liquid freezes. Students measure the heating and cooling curves for the solid and identify the unknown based on its melting point. Kit contains three low-melting organic “unknowns” and borosilicate glass test tubes. Reproducible student handouts, detailed background information, complete Teacher Notes with sample data and answers to all questions and all chemicals and consumable supplies needed to perform the lab are provided.

Complete for 30 students working in pairs. Fifteen digital thermometers are recommended and available separately.

Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Asking questions and defining problems
Developing and using models
Planning and carrying out investigations
Analyzing and interpreting data
Using mathematics and computational thinking
Constructing explanations and designing solutions

Disciplinary Core Ideas

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

Crosscutting Concepts

Patterns
Cause and effect
Systems and system models
Energy and matter
Stability and change

Performance Expectations

HS-PS1-3. Plan and conduct an investigation to gather evidence to compare the structure of substances at the bulk scale to infer the strength of electrical forces between particles.
HS-PS3-1. Create a computational model to calculate the change in the energy of one component in a system when the change in energy of the other component(s) and energy flows in and out of the system are known.
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).