11.6 Classification of Solids by Type of Attraction of Units
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Plastic Sulfur Yellow powdered sulfur is heated until it becomes molten and brown. At first it flows freely, but then it becomes very viscous. Upon further heating, the viscous sulfur flows freely again and ignites. The burning liquid sulfur is poured into a beaker of water. When removed from the water, the sulfur is rubbery and flexible.
Designing and Conducting a Purification Scheme as an Organic Chemistry Laboratory PracticalKate J. Graham, Brian J. Johnson, T. Nicholas Jones, Edward J. McIntee, and Chris P. Schaller Describes an open-ended laboratory practical that challenges students to evaluate when different purification techniques are appropriate. Graham, Kate J.; Johnson, Brian J.; Jones, T. Nicholas; McIntee, Edward J.; Schaller, Chris P. J. Chem. Educ.2008, 85, 1644.
IR Spectroscopy |
Microscale Lab |
Molecular Properties / Structure |
NMR Spectroscopy |
Physical Properties |
Separation Science
The Electrochemical Synthesis of Transition-Metal AcetylacetonatesS. R. Long, S. R. Browning, and J. J. Lagowski The electrochemical synthesis of transition-metal acetylacetonates can assist in the transformation of an entry-level laboratory course into a research-like environment where all members of a class are working on the same problem, but each student has a personal responsibility for the synthesis and characterization of a specific compound. Long, S. R.; Browning, S. R.; Lagowski, J. J. J. Chem. Educ.2008, 85, 1429.
Coordination Compounds |
Electrochemistry |
IR Spectroscopy |
Physical Properties |
Synthesis |
Transition Elements |
UV-Vis Spectroscopy
On Capillary Rise and NucleationR. Prasad A comparison of capillary rise and nucleation shows that both phenomena result from a balance between two competing energy factors: a volume energy and a surface energy. This comparison may help to introduce nucleation with capillary rise, a topic familiar to students. Prasad, R. J. Chem. Educ.2008, 85, 1389.
Boiling and Freezing PointsEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Physical Properties
Floating Squares (GCMP)David M. Whisnant Floating Squares: this is a resource in the collection "General Chemistry Multimedia Problems". In this problem we will coat a piece of notecard with graphite (from pencil lead). We then will float the piece in two beakers containing water and a second solvent. General Chemistry Multimedia Problems ask students questions about experiments they see presented using videos and images. The questions asked apply concepts from different parts of an introductory course, encouraging students to decompartmentalize the material.
Physical Properties
Floating FootballsEd Vitz A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
