Click on the title of a resource to view it. To save screen space, only the first 3 resources are shown. You can display more resources by scrolling down and clicking on “View all xx results”.
For the textbook, chapter, and section you specified we found
Crystallization of Supersaturated Sodium Acetate A supersaturated solution of sodium acetate is poured onto one small sodium acetate crystal. Crystals form from the liquid immediately upon contact with the seed crystal. A thermometer shows that the crystallization process is exothermic. A chemical hot pack is shown as an example of a commercially available supersaturated solution.
Precipitation / Solubility |
Solutions / Solvents |
Calorimetry / Thermochemistry
Scattering and Absorption of Light The effects of passing light through a colloidal suspension of milk in water and through a solution of copper sulfate are shown.
Solutions : FreezePtDepression (20 Variations) It takes 6.86 kg of ethylene glycol (antifreeze) to decrease the freezing point of 6.50 kg of water to -25.0oF (-31.7oC). How much sodium chloride (NaCl) would it take to decrease the freezing point of 6.50 kg of water to -25.0oF? (Assuming all the salt will dissolve in that amount of water.)
Hydrophilic Inorganic Macro-Ions in Solution: Unprecedented Self-Assembly Emerging from Historical "Blue Waters"Tianbo Liu, Ekkehard Diemann, and Achim Müller The behavior of supramolecular structures in solution is different from that of simple ions, polymers, surfactant micelles, and colloids. New research involving polyoxometalates, which are fully hydrophilic but tend to self-associate into macro-ionic structures, may change our understanding of inorganic ionic solutions. Liu, Tianbo; Diemann, Ekkehard; Müller, Achim. J. Chem. Educ.2007, 84, 526.
Aqueous Solution Chemistry |
Colloids |
Materials Science |
Nanotechnology |
Solutions / Solvents |
Spectroscopy |
Lasers |
Physical Properties
Sedimentation Time Measurements of Soil Particles by Light Scattering and Determination of Chromium, Lead, and Iron in Soil Samples via ICPPatricia Metthe Todebush and Franz M. Geiger In this two-part general chemistry laboratory activity, students study soil samples from home and from campus. In part one, the samples are placed in water and the suspended colloid fraction is separated using filtration, followed by a determination of colloid sedimentation rates via light scattering. In part two, the solid phase of the soil samples is dissolved in acid and analyzed for chromium, lead, and iron using an inductively coupled plasma spectrometer. The experiment can be expanded to include arsenic. Through these experiments students can draw conclusions about the physical and chemical behavior of solid components in soil, paying particular attention to their propensity for transporting and chemically transforming pollutants in the environment. Todebush, Patricia Metthe; Geiger, Franz M. J. Chem. Educ.2005, 82, 1542.
Colloids |
Geochemistry |
Water / Water Chemistry |
Aqueous Solution Chemistry |
Solids |
Surface Science |
Metals
Self-Assembled Colloidal Crystals: Visualizing Atomic Crystal Chemistry Using Microscopic Analogues of Inorganic SolidsNeal M. Abrams and Raymond E. Schaak Monodisperse spherical colloids spontaneously crystallize into close-packed crystals, in analogy to the simple crystal structures of many of the elements. Since colloids are orders of magnitude larger than atoms, students can directly observe crystal structure and behavior in a microscope using colloidal crystals. This laboratory exercise provides a modular series of materials science experiments appropriate for undergraduate chemistry and engineering majors. The individual modules include aspects of chemical synthesis (monodisperse SiO2 and polymer spheres), self-assembly (colloidal crystallization), and structural characterization through microscopy (optical and scanning electron microscopies) and optical spectroscopy (optical diffraction and UVvisible spectroscopy). Abrams, Neal M.; Schaak, Raymond E. J. Chem. Educ.2005, 82, 450.
