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Colors of Elements in a Flame Aqueous solutions of various compounds are sprayed into a Meeker burner flame from an atomizer.
Atomic Properties / Structure |
Descriptive Chemistry |
Spectroscopy
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?
E = mc2 for the Chemist: When Is Mass Conserved?Richard S. Treptow Einstein's famous equation is frequently misunderstood in textbooks and popular science literature. Its correct interpretation is that mass and energy are different measures of a single quantity known as massenergy, which is conserved in all processes. Treptow, Richard S. J. Chem. Educ.2005, 82, 1636.
Atomic Properties / Structure |
Nuclear / Radiochemistry |
Theoretical Chemistry |
Thermodynamics
Einstein RevisitedLeonard Fine Examines Einstein's contributions to chemistry, particularly his work on the photoelectric effect, molecular dimensions, and Brownian motion. Fine, Leonard. J. Chem. Educ.2005, 82, 1601.
Quantum Chemistry |
Kinetic-Molecular Theory
Turning on the Light: Lessons from LuminescencePatricia B. OHara, Carol Engelson, and Wayne St. Peter The goal of this article is to provide secondary school science teachers with a background in an array of luminescent phenomena including fluorescence, phosphorescence, and chemiluminescence that will enable them to teach their students fundamental properties of light and matter. Instructions for building and operating a simple spectrofluorometer and five detailed lesson plans are provided in the Supplemental Material for experiments that utilize these processes. O'Hara, Patricia B.; Engelson, Carol; St. Peter, Wayne. J. Chem. Educ.2005, 82, 49.
The Nature of Electromagnetic RadiationEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
