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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.
Lanthanum (La) and Actinium (Ac) Should Remain in the d-blockLaurence Lavelle This paper discusses the reasons and implications of placing lanthanum and actinium in the f-block and lutetium and lawrencium in the d-block. Lavelle, Laurence. J. Chem. Educ.2008, 85, 1482.
Atomic Properties / Structure |
Inner Transition Elements |
Periodicity / Periodic Table |
Transition Elements
Mistake of Having Students Be Mendeleev for Just a DayBrett Criswell This article discusses several conceptual features underlying a genuine understanding of the periodic table and describes a set of activities focused on promoting such awareness in students using the FERA (focus, explore, reflect, and apply) learning cycle model. Criswell, Brett. J. Chem. Educ.2007, 84, 1140.
Periodicity / Periodic Table
The Place of Zinc, Cadmium, and Mercury in the Periodic TableWilliam B. Jensen Explanation for why the zinc group belongs with the main group elements; includes several versions of periodic tables. Jensen, William B. J. Chem. Educ.2003, 80, 952.
