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Hydrogen Balloon Explosions Balloons containing various substances and hydrogen are exploded, revealing characteristic flame colors. In all cases except one, the substance had been mixed with methanol and water.
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
Mendeleev on the Periodic Law: Selected Writings, 1869–1905 (William B. Jensen, ed.)Theodor Benfey The periodic properties of the elements is the chemists central organizing principle. Here are 13 of Mendeleevs complete or partial publications that illuminate his developing ideas on periodicity. Benfey, Theodor. J. Chem. Educ.2007, 84, 1279.
Descriptive Chemistry |
Periodicity / Periodic Table |
Theoretical Chemistry
A Kool Reaction from the Fine PrintSusan A. S. Hershberger and Arlyne M. Sarquis Students investigate the reduction of artificial food dyes by citric acid-promoted oxidation of a metal in the form of fine or coarse steel wool. The artificial red and yellow food dyes present in drink mixes contain azo linkages (nitrogennitrogen double bonds) that are readily reduced to colorless products under mild reducing conditions. Hershberger, Susan A. S.; Sarquis, Arlyne M. J. Chem. Educ.2006, 83, 1792A.
Characteristics of MaterialsAmerican Chemical Society What makes diapers absorbent? Is peanut butter stickier than syrup or jelly? Strong, stretchy, sticky, or sweet—everything around us has special properties which make them unique. See if you can identify and compare the characteristics of materials.
