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Hardness of Solid Substances - Grinding A number of metals and nonmetals are ground with a mortar and pestle. The nonmetals shown here are all soft (due to weak intermolecular forces), but the metals vary in hardness.
Sodium Chloride Crystal Cleavage A knife is placed on a large sodium chloride crystal parallel to a cleavage plane. When the knife is tapped, the crystal breaks cleanly, creating two smaller crystals.
Bonding : MatchBondStrength (8 Variations)
Match each of the following molecules to the best energy value for each bond. Do not use the table of bond energies in your book, but predict these values using your knowledge of bond length and bond strength.
Possible energies are: 300 kJ/mol, 330 kJ/mol, 415 kJ/mol and 950 kJ/mol.
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
Ionic BlocksRichard S. Sevcik, Rex Gamble, Elizabet Martinez, Linda D. Schultz, and Susan V. Alexander "Ionic Blocks" is a teaching tool designed to help middle school students visualize the concepts of ions, ionic compounds, and stoichiometry. It can also assist high school students in reviewing their subject mastery. Sevcik, Richard S.; Gamble, Rex; Martinez, Elizabet; Schultz, Linda D.; Alexander, Susan V. J. Chem. Educ.2008, 85, 1631.
Ionic Bonding |
Nomenclature / Units / Symbols |
Nonmajor Courses |
Stoichiometry
Reply to More on CIO and Related RadicalsMark Kobrak and Warren Hirsch We thank Prof. Jensen for bringing Dr. Linnetts work on oxygenhalogen diatomics to our attention. We were not aware that quartet theory had been applied in this way. Kobrak, Mark; Hirsch, Warren. J. Chem. Educ.2008, 85, 783.
