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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.
A-DNA and B-DNA: Comparing Their Historical X-ray Fiber Diffraction ImagesAmand A. Lucas This paper provides a comparative explanation of the structural content of the diffraction diagrams of A-DNA and B-DNA that facilitated the discovery of the double-helical structure of DNA by Watson and Crick in 1953. This analysis is supported a method that simulates both A-DNA and B-DNA X-ray images optically. Lucas, Amand A. J. Chem. Educ.2008, 85, 737.
Biophysical Chemistry |
Conformational Analysis |
Crystals / Crystallography |
X-ray Crystallography |
Nucleic Acids / DNA / RNA
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
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.
