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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.
E = mc2: An Intuitive DerivationJames J. Leary and William H. Ingham Einstein's famous equation E = mc2 is derived using a thought experiment that can easily be understood by any serious student of chemistry. Leary, James J.; Ingham, William H. J. Chem. Educ.2007, 84, 1651.
Millikan: Good to the Last (Oil) DropEarl F. Pearson In this analogy, drop-shaped pieces of magnet represent oil drops, steel BBs represent the electrons, and the mass of a BB represents the charge of an electron. The smallest possible difference in mass between any two samples of BBs should be the mass of a single BB. Pearson, Earl F. . J. Chem. Educ.2006, 83, 1312A.
The Amount of Substance: MolesEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
