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Sodium Chloride Crystal Cleavage A knife is placed on a large sodium chloride crystal parallel to a cleavage plane. When the knife is tapped, the crystal breaks cleanly, creating two smaller crystals.
Crystals / Crystallography |
Ionic Bonding |
Solids
Piezoelectric Effect Sounds accompany the discharges of electricity.
A piezoelectric crystal is connected to a light bulb. When the crystal is pressed, the light flashes.
Crystals / Crystallography |
Molecular Properties / Structure |
Solid State Chemistry |
Solids
Thermochromism: Mercury(II) Iodide When red-orange Mercury(II) Iodide (HgI2) is heated, it undergoes a phase transition at 126oC to a pale yellow form. As the heated sample cools, it gradually returns to the original red-orange color.
Exploring Solid-State Structure and Physical Properties: A Molecular and Crystal Model ExerciseThomas H. Bindel This laboratory allows students to examine relationships among the microscopicmacroscopicsymbolic levels using crystalline mineral samples and corresponding crystal models. The exercise also reinforces Lewis dot structures, VSEPR theory, and the identification of molecular and coordination geometries. Bindel, Thomas H. J. Chem. Educ.2008, 85, 822.
Crystals / Crystallography |
Molecular Properties / Structure |
Molecular Modeling |
Solids |
VSEPR Theory |
Lewis Structures |
Physical Properties
Using Two-Dimensional Colloidal Crystals To Understand Crystallography Stephanie A. Bosse and Nikolaus M. Loening Describes a simple experiment that uses micrometer-sized latex spheres to form two-dimensional colloidal crystals. Diffraction patterns formed by passing a laser beam through these crystals reveal their symmetry and allow the determination of the size of the particles that make up the crystal. Bosse, Stephanie A.; Loening, Nikolaus M. J. Chem. Educ.2008, 85, 93.
Colloids |
Crystals / Crystallography |
Lasers |
X-ray Crystallography
Stuffed Derivatives of Close-Packed StructuresBodie E. Douglas Examines a variety of stuffed silica crystal structures in terms of the close-packing of one set of atoms or ions (P sites) with other atoms or ions in tetrahedral (T) or octahedral (O) sites and filled or partially filled layers in the regular pattern, PTOT. Douglas, Bodie E. J. Chem. Educ.2007, 84, 1846.
