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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.
Artistic Periodic Table in Honor of MendeleevAntonio Marchal Ingrain A large periodic table was placed on the main faade of the Sciences Building at the University of Jan (Spain) in November 2007 in honor of Mendeleev on the 100th anniversary of his death and in recognition of the Spanish Year of Science. Ingrain, Antonio Marchal. J. Chem. Educ.2008, 85, 1489.
Periodicity / Periodic Table
The Different Periodic Tables of Dmitrii MendeleevMichael Laing Between 1869 and 1905 the Russian chemist Dmitrii Mendeleev published several tables with different arrangements of the chemical elements. Four of these are compared with periodic tables by Russian scientists from 1934 and 1969. Laing, Michael. J. Chem. Educ.2008, 85, 63.
Descriptive Chemistry |
Enrichment / Review Materials |
Periodicity / Periodic Table
Hydration of Acetylene: A 125th AnniversaryDmitry A. Ponomarev and Sergey M. Shevchenko The discovery the hydration of alkynes catalyzed by mercury ions by Mikhail Kucherov made possible industrial production of acetaldehyde from acetylene and had a profound effect on the development of industrial chemistry in the 1920th centuries. Ponomarev, Dmitry A.; Shevchenko, Sergey M. J. Chem. Educ.2007, 84, 1725.
