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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.
An incomplete concept map is shown below, which set of terms for A, B, C and D would result in a correct map based on the concept of wave mechanics applied to a hydrogen atom?
Examining Quantum Oddities within the Context of Other Major Scientific TheoriesPablo A. Molina This article presents an epistemological discussion on the conceptual hurdles shared by quantum theory and evolution, gravity, and special relativity, and offers students a logical structure to deal with waveparticle duality, the uncertainty principle, boundary conditions, and the quantization of energy. Molina, Pablo A. J. Chem. Educ.2008, 85, 1229.
Quantum Chemistry |
Theoretical Chemistry
The Mechanism of Covalent Bonding: Analysis within the Hückel Model of Electronic StructureSture Nordholm, Andreas Bäck, and George B. Bacskay Hckel molecular orbital theory is shown to be uniquely useful in understanding and interpreting the mechanism of covalent bonding. Using the Hckel model it can be demonstrated that the dynamical character of the molecular orbitals is related simultaneously to the covalent bonding mechanism and to the degree of delocalization of the electron dynamics. Nordholm, Sture; Bäck, Andreas; Bacskay, George B. J. Chem. Educ.2007, 84, 1201.
Covalent Bonding |
MO Theory |
Quantum Chemistry |
Theoretical Chemistry
Entropy and the Shelf Model: A Quantum Physical Approach to a Physical PropertyArnd H. Jungermann A quantum physical approach relying on energy quantization leads to three simple rules which are the key to understanding the physical property described by molar entropy values. Jungermann, Arnd H. J. Chem. Educ.2006, 83, 1686.
Interactive Electron ConfigurationsWilliam F. Coleman An application that allows students to drag electrons onto energy levels to construct electron configurations for atoms up to atomic number Ar. The student is responsible for obeying the fundamental rules of quantum mechanics.
Atomic Properties / Structure |
Periodicity / Periodic Table |
Enrichment / Review Materials
Solving the Hydrogen AtomTodd M. Hamilton After practicing with the particle-in-a-box problem, students solve the H atom symbolically using the derivatives feature in MathCad. The result is an expression for the energy levels of the hydrogen atom. Students will also prove that the radial part of the wavefunction is normalized and explore the concept of an orbital.
