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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
Use of the Primitive Unit Cell in Understanding Subtle Features of the Cubic Close-Packed StructureJohn A. Hawkins, Linda M. Soper, Jeffrey L. Rittenhouse, and Robert C. Rittenhouse Examines the pedagogical advantages in presenting the primitive rhombohedral unit cell as a means of helping students to gain greater insight into the nature of the cubic close-packed structure. Hawkins, John A.; Soper, Linda M.; Rittenhouse, Jeffrey L.; Rittenhouse, Robert C. J. Chem. Educ.2008, 85, 90.
Crystals / Crystallography |
Metals |
Solids
Filling in the Hexagonal Close-Packed Unit CellRobert C. Rittenhouse, Linda M. Soper, and Jeffrey L. Rittenhouse The illustrations of the hcp unit cell that are used in textbooks at all levels and also in crystallography and solid-state reference works are incomplete, in that they fail to include fractions of middle layer atomic spheres with centers lying outside of the unit cell. Rittenhouse, Robert C.; Soper, Linda M.; Rittenhouse, Jeffrey L. J. Chem. Educ.2006, 83, 175.
