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Product 12626

By: Mark Langella, Mahopac High School, Mahopac, NY

The Intermolecular Attractions Multi-Demonstration Kit for chemistry shows students what happens when molecules attract each other—or don’t. Students study hydrogen bonding, dipole–dipole attractions, cohesive and adhesive forces and more.

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Molecules can’t be seen, but we can see the forces between molecules. Use this set of four demonstrations to show students what happens when molecules attract each other—or don’t!
• Floating Oil Droplet—The difference in densities of water and ethyl alcohol causes an oil droplet to “float” in the middle of a beaker.
• Bubble Shapes—Straws and twist ties are used to create beautiful geometric bubbles when dipped in a soap solution.
• Capillary Action—Measure and compare the ability of water and ethyl alcohol to rise in a glass capillary tube.
• Vanishing Volume—What happens to the 5 mL that was lost when 50 mL portions of water and ethyl alcohol are added together?

Use each demonstration separately to illustrate different types of intermolecular forces, or perform them all together for review or assessment.

Concepts: Surface tension, hydrogen bonding, dipole–dipole attractions, cohesive and adhesive forces, London dispersion forces.
Time Required: 30 minutes


Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Asking questions and defining problems
Developing and using models

Disciplinary Core Ideas

MS-PS1.A: Structure and Properties of Matter
HS-PS1.A: Structure and Properties of Matter

Crosscutting Concepts

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

Performance Expectations

MS-PS1-1. Develop models to describe the atomic composition of simple molecules and extended structures.