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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.
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.
Electronegativity and the Bond TriangleTerry L. Meek and Leah D. Garner The dependence of bond type on two parameters, electronegativity difference (??) and average electronegativity (?av), is examined. It is demonstrated that ionic character is governed by the partial charges of the bonded atoms, and metallic character by the HOMOLUMO band gap. Meek, Terry L.; Garner, Leah D. J. Chem. Educ.2005, 82, 325.
Atomic Properties / Structure |
Covalent Bonding |
Metallic Bonding |
Ionic Bonding |
Main-Group Elements
How We Teach Molecular Structure to FreshmenMichael O. Hurst Examination of how textbooks discuss various aspects of molecular structure; conclusion that much of general chemistry is taught the way it is for historical and not pedagogical reasons. Hurst, Michael O. J. Chem. Educ.2002, 79, 763.
Covalent Bonding |
Atomic Properties / Structure |
Molecular Properties / Structure |
Lewis Structures |
VSEPR Theory |
Valence Bond Theory |
MO Theory
Electronegativity and Bond Type: Predicting Bond TypeGordon Sproul Important limitations with using electronegativity differences to determine bond type and recommendations for using electronegativities in general chemistry. Sproul, Gordon. J. Chem. Educ.2001, 78, 387.
