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Isotopes: Heavy Water Ice Cubes An H2O ice cube is shown to float in a beaker of liquid water, while an ice cube of D2O (heavy water) is shown to sink in liquid water.
Hydrogen Bonding |
Isotopes |
Physical Properties |
Atomic Properties / Structure |
Water / Water Chemistry
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.
Atoms,_Molecules_and_Ions : CalcAtmWeight (10 Variations)
Chlorine has two naturally occurring isotopes, 35Cl and 37Cl, with masses of 34.9689 amu and 36.9659 amu, respectively. Calculate the abundances of these isotopes of chlorine.
Illustrating the Concepts of Isotopes and Mass Spectrometry in Introductory Courses: A MALDI-TOF Mass Spectrometry Laboratory ExperimentNancy Carter Dopke and Timothy Neal Lovett This article describes a matrix-assisted laser desorption/ionization (MALDI) mass spectrometry experiment in which students prepare peptide samples for mass analysis and then collect and analyze mass spectral data. The lab provides hands-on experience with research instrumentation and reinforces the concepts of isotopes, molecular masses, and molecular formulas. Dopke, Nancy Carter; Lovett, Timothy Neal. J. Chem. Educ.2007, 84, 1968.
Isotopes |
Mass Spectrometry |
Proteins / Peptides
Guitar Strings as Standing Waves: A DemonstrationMichael Davis This demonstration uses an acoustic guitar to produce three unique harmonic vibrations, each of which is representative of a standing wave and illustrates the concept of quantization. Davis, Michael. J. Chem. Educ.2007, 84, 1287.
