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Magic Sand The grains of Magic Sand have been specially treated in a way that greatly reduces the attraction of water molecules to their surfaces.
Noncovalent Interactions
Floating Squares Graphite (from a pencil lead) is applied to one side of an index card and a piece of the card is immersed in a beaker containing hexane and water (two layers). The graphite-coated side always faces the hexane layer. When the two liquids are carbon tetrachloride and water the graphite-coated side always faces the carbon tetrachloride.
Noncovalent Interactions |
Physical Properties
Hydrophobic Effect Hydrophobic Effect: Octanoic acid forms a monolayer on the surface of water under certain conditions.
Solutions : GeneralSurfactants (20 Variations)
You can make homemade soap by combining a fat (tallow, lard, vegetable oil, etc.) with a source of alkali (lye). What is the purpose of the fat in soap?
A New "Bottom-Up" Framework for Teaching Chemical BondingTami Levy Nahum, Rachel Mamlok-Naaman, Avi Hofstein, and Leeor Kronik This article presents a general framework for bonding that can be presented at different levels of sophistication depending on the student's level and needs. The pedagogical strategy for teaching this model is a "bottom-up" one, starting with basic principles and ending with specific properties. Levy Nahum, Tami; Mamlok-Naaman, Rachel; Hofstein, Avi; Kronik, Leeor. J. Chem. Educ.2008, 85, 1680.
Atomic Properties / Structure |
Covalent Bonding |
Ionic Bonding |
Lewis Structures |
Materials Science |
MO Theory |
Noncovalent Interactions
Stilling Waves with Ordered Molecular MonolayersEd Vitz The amazing ability of a film of oil one molecule thick to dissipate the relatively large energy of water waves can be readily demonstrated, but an explanation of the effect has been elusive until recently. Vitz, Ed. J. Chem. Educ.2008, 85, 1064.
Lipids |
Molecular Properties / Structure |
Noncovalent Interactions |
Surface Science |
Water / Water Chemistry |
Fatty Acids
A Lab Experience To Illustrate the Physicochemical Principles of DetergencyJ. A. Poce-Fatou, M. Bethencourt-Núñez, C. Moreno, F. J. Moreno-Dorado, and J. J. Pinto-Ganfornina This article presents a lab to study the role of a surfactant and builder in laundry detergent efficiency as determined through measurements of the diffuse reflectances of polyester samples impregnated with linseed oil. Poce-Fatou, J. A.; Bethencourt-Núñez, M.; Moreno, C.; Moreno-Dorado, F. J.; Pinto-Ganfornina, J. J. J. Chem. Educ.2008, 85, 266.
Dipole ForcesEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Molecular Properties / Structure |
Noncovalent Interactions
London ForcesEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Noncovalent Interactions
Intermolecular Forces (Netorials)Rachel Bain, Mithra Biekmohamadi, Liana Lamont, Mike Miller, Rebecca Ottosen, John Todd, and David Shaw Intermolecular Forces: this is a resource in the collection "Netorials". In this resource there is a review of Lewis structures, molecular geometry, electronegativity, or molecular polarity. After that, you can learn about the forces of attraction that exist between molecules. This module explores London forces and dipole-dipole forces (including hydrogen bonds). The Netorials cover selected topics in first-year chemistry including: Chemical Reactions, Stoichiometry, Thermodynamics, Intermolecular Forces, Acids & Bases, Biomolecules, and Electrochemistry.
