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This unit focuses on the attractive forces felt between molecules. Both London Dispersion and Dipole‐Dipole intermolecular attractions will be discussed with emphasis on factors such as polarity and surface area as defining factors in how strong the intermolecular attractions will be and the affect this has on the properties of materials.
Students will be able to:
• Describe the difference between the kinds of molecules attracted via London Dispersion attractions and Dipole‐Dipole attractions.
• Indicate which type of intermolecular attraction is generally stronger
• Describe two factors that affect the strength of intermolecular attractions.
• Determine which substance would have the highest boiling point based upon its molecular structure.
• Explain why oil and water donʹt mix.
The molecular world is sticky. Weak electrostatic and van der Waals forces hold molecules in position.
Additional Related Concepts
An interesting extension is the employment of weak forces in filters such as Active Filters: http://molo.concord.org/database/activities/239.html
Another extension is Distillation and the Role of Weak Forces: http://molo.concord.org/database/activities/274.html
Fermi Lab's ARISE Project suggests the following enhancement to this SAM unit: http://www.concord.org/~barbara/SAM/ARISE/ARISE_SAM_intermolecular.pdf
The water from the well that supplies your house is running brown -- there are lots of polluting particles in it. How would you set up a system to get clear water?
Created by CC Project: SAM using Molecular Workbench
Last Update: 12/07/2015
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These materials are based upon work supported
by the National Science Foundation under grant numbers
9980620, ESI-0242701 and EIA-0219345
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