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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.
Optical Properties of Fluorescent Mixtures: Comparing Quantum Dots to Organic DyesBenjamin M. Hutchins, Thomas T. Morgan, Miné G. Ucak-Astarlioglu, and Mary Elizabeth Williams Visually observed fluorescent colors of quantum dots in conjunction with spectroscopic data show students the additive emission of such mixtures; while some appear to emit white light, their fluorescence peaks remain spectroscopically resolved. Hutchins, Benjamin M.; Morgan, Thomas T.; Ucak-Astarlioglu, Miné G.; Williams, Mary Elizabeth. J. Chem. Educ.2007, 84, 1301.
Dyes / Pigments |
Fluorescence Spectroscopy |
Materials Science |
Nanotechnology |
Photochemistry |
Qualitative Analysis |
Spectroscopy |
UV-Vis Spectroscopy
Cotton Effect in Copper–Proline Complexes in the Visible RegionVictor Volkov and Rolf Pfister This article suggests taking advantage of the visible dd electronic transition of Cu2+, which allows one to contrast the normal optical rotatory dispersion response of d- and l-proline in aqueous solution with the strong Cotton effect observed when these amino acids are complexed with a metal cation. Volkov, Victor; Pfister, Rolf. J. Chem. Educ.2005, 82, 1663.
Inorganic Molecules; A Visual DatabaseCharles E. Ophardt, Evan M. Davis, Dustin Underwood Inorganic Molecules: A Visual Data Base contains text and graphics describing 66 molecules and ions commonly used as examples in general chemistry courses. For each molecule, fifteen molecular properties are presented visually by eight or nine different molecular models created by the CAChe Scientific Molecular Modeling program.
Spectrophotometer, Scanning UV-Visible (ChemPages Lab)John W. Moore, Jerrold J. Jacobsen, Joe L. March Spectrophotometer, Scanning UV/Visible: this is a resource in the collection "ChemPages Laboratory Resources". A scanning ultraviolet/visible (UV/Vis) spectrophotometer operates on the same principles as a Spectronic 20?. They both can be used for qualitative and quantitative analysis. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
