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Discovery VideosLyubov Hoffman Laroche, Gary Wulfsberg, Barbara Young The use of digital video for instruction has many advantages. In many situations the only way to present some chemical phenomena is through the use of video. The two video lessons presented here are examples intended to supplement our article in the August 2003 issue of JCE.
Descriptive Chemistry |
Periodicity / Periodic Table
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.
News from the Periodic Table: An Introduction to "Periodicity Symbols, Tables, and Models for Higher-Order Valency and Donor–Acceptor Kinships"Henry A. Bent and Frank Weinhold Proposes that alternative display topologies such as a 2D "left-step" or "step-pyramid" table or 3D "periodic towers" can supplement or supplant the standard periodic table by better emphasizing higher-order patterns of chemical association and reactivity, rather than the physical resemblances of standard-state elemental substances. Bent, Henry A.; Weinhold, Frank. J. Chem. Educ.2007, 84, 1145.
Atomic Properties / Structure |
Periodicity / Periodic Table |
Spectroscopy
Trends in Ionization Energy of Transition-Metal ElementsPaul S. Matsumoto Examines why, as the number of protons increase along a row in the periodic table, the first ionization energies of the transition-metal elements are relatively steady, but that for the main-group elements increases. Matsumoto, Paul S. J. Chem. Educ.2005, 82, 1660.
Atomic Properties / Structure |
Periodicity / Periodic Table |
Transition Elements
A Program of Computational Chemistry Exercises for the First-Semester General Chemistry CourseScott E. Feller, Richard F. Dallinger, and Paul Caylor McKinney A series of 13 molecular modeling exercises designed for the first-semester general chemistry course is described. The modeling exercises, which are used as both prelecture explorations and postlecture problems, increase in difficulty and in student independence. Feller, Scott E.; Dallinger, Richard F.; McKinney, Paul Caylor. J. Chem. Educ.2004, 81, 283.
