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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.
Effectiveness of a MORE Laboratory Module in Prompting Students To Revise Their Molecular-Level Ideas about SolutionsLydia T. Tien, Melonie A. Teichert, and Dawn Rickey This study investigates the effectiveness of a ModelObserveReflectExplain (MORE) laboratory module in prompting three different populations of general chemistry students to revise their molecular-level ideas regarding chemical compounds dissolved in water. Tien, Lydia T.; Teichert, Melonie A.; Rickey, Dawn. J. Chem. Educ.2007, 84, 175.
Aqueous Solution Chemistry |
Conductivity |
Ionic Bonding |
Solutions / Solvents
Entropy and the Shelf Model: A Quantum Physical Approach to a Physical PropertyArnd H. Jungermann A quantum physical approach relying on energy quantization leads to three simple rules which are the key to understanding the physical property described by molar entropy values. Jungermann, Arnd H. J. Chem. Educ.2006, 83, 1686.
Alcohols |
Alkanes / Cycloalkanes |
Carboxylic Acids |
Covalent Bonding |
Ionic Bonding |
Physical Properties |
Quantum Chemistry |
Thermodynamics
What Happens When Chemical Compounds Are Added to Water? An Introduction to the Model–Observe–Reflect–Explain (MORE) Thinking FrameAdam C. Mattox, Barbara A. Reisner, and Dawn Rickey This article describes a laboratory designed to help students understand how different compounds behave when dissolved in water, and introduces the modelobservereflectexplain (MORE) thinking frame, an instructional tool that encourages students to connect macroscopic observations with their understanding of the behavior of particles at the molecular level. Mattox, Adam C.; Reisner, Barbara A.; Rickey, Dawn. J. Chem. Educ.2006, 83, 622.
Lattice EnergyWilliam F. Coleman PowerPoint presentation covering various aspects of the concept of lattice energy at the introductory and intermediate inorganic chemistry level. The presentation will open directly in the browser if your system has been so configured.
Crystals / Crystallography |
Ionic Bonding |
Solids |
Enrichment / Review Materials
Radius RatioWilliam F. Coleman This is a set of animations that demonstrates properties of the spherical holes formed when uniform spheres are packed. Cubic, octahedral and tetrahedral packing arrangements may be examined without anything in the holes,and with the repective holes filled. The sizes of the various holes relative to the spheres being packed are shown, which can lead students into an exploration of the radius ratio concept. An example is given of computing the relative size of an octahedral hole.
Crystals / Crystallography |
Ionic Bonding |
Solids |
Enrichment / Review Materials
Ionic BondingEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
