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Paramagnetism: Compounds Vials of a number of compounds (NaCl, MnSO4, FeSO4, CoCl2, NiSO4, ZnSO4, K4Fe(CN)6, [Co(NH3)6]Cl3, [Ni(NH3)6]Cl2, and H2O) are hung from a thread. When a magnet is brought near, some of the vials are attracted.
Magnetic Properties |
Atomic Properties / Structure
Paramagnetism: Oxidation States of Manganese Manganese(III) oxide, with 4 unpaired electrons per Mn atom, is more strongly attracted to a magnet than is manganese(IV) oxide, with only 3 unpaired electrons per Mn atom. Potassium permanganate, a compound of Mn(VII), has no unpaired electrons and is not attracted to a magnet.
An incomplete concept map is shown below, which set of terms for A, B, C and D would result in a correct map based on the concept of wave mechanics applied to a hydrogen atom?
Guitar Strings as Standing Waves: A DemonstrationMichael Davis This demonstration uses an acoustic guitar to produce three unique harmonic vibrations, each of which is representative of a standing wave and illustrates the concept of quantization. Davis, Michael. J. Chem. Educ.2007, 84, 1287.
Atmospheric Chemistry |
Atomic Properties / Structure |
Atomic Spectroscopy
Flame Tests: Which Ion Causes the Color?Michael J. Sanger Students determine which of the ions in a series of ten commercially-available ionic compounds are responsible for the observed colors by performing flame test experiments using cotton swabs and a Bunsen burner. Sanger, Michael J. J. Chem. Educ.2004, 81, 1776A.
Atomic Properties / Structure |
Qualitative Analysis |
Student-Centered Learning
A Framework for Presenting the Modern AtomJames J. Leary and Tadd C. Kippeny A flow chart is presented that summarizes major empirical and theoretical accomplishments that contributed to the modern view of the atom. A chronology is included to show the time dependence of the various contributions. Suggestions are made about how this chart can be used in a variety of contexts as a framework for discussing science as a process. Leary, James J.; Kippeny, Tadd C. J. Chem. Educ.1999, 76, 1217.
The Amount of Substance: MolesEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
