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Phase Changes By using a coolant at a temperature below the boiling point of the gases chlorine, bromine and iodine, the gases are condensed into liquid form.
Phases / Phase Transitions / Diagrams
Critical Point of Benzene A sealed tube containing benzene liquid and vapor is heated. As the critical temperature is approached, the meniscus flattens. At the critical temperature the meniscus disappears, and separate liquid and vapor phases can no longer be detected.
Phases / Phase Transitions / Diagrams
Steam and Superheated Steam When a gas burner heats the steam coil strongly, the steam becomes superheated and is at a high enough temperature to ignite a match and react quickly with steel wool
Fog Machines, Vapors, and Phase DiagramsEd Vitz This series of demonstrations elucidate the operation of commercial fog machines using common laboratory materials and can be adapted for elementary through tertiary levels. The formation of fogs is discussed in terms of the phase diagram for water and other chemical principles. Vitz, Ed. J. Chem. Educ.2008, 85, 1385.
Liquids |
Phases / Phase Transitions / Diagrams |
Physical Properties |
Water / Water Chemistry
Using Graphs of Gibbs Energy versus Temperature in General Chemistry Discussions of Phase Changes and Colligative PropertiesRobert M. Hanson, Patrick Riley, Jeff Schwinefus, and Paul J. Fischer The use of qualitative graphs of Gibbs energy versus temperature is described in the context of chemical demonstrations involving phase changes and colligative properties at the general chemistry level. Hanson, Robert M.; Riley, Patrick; Schwinefus, Jeff; Fischer, Paul J. J. Chem. Educ.2008, 85, 1142.
Phases / Phase Transitions / Diagrams |
Physical Properties |
Thermodynamics
"Concept Learning versus Problem Solving": Does Particle Motion Have an Effect?Michael J. Sanger, Eddie Campbell, Jeremy Felker, and Charles Spencer 210 students were asked to answer a static, particulate-level, multiple-choice question concerning gas properties. Then they viewed an animated version of the question and answered the multiple-choice question again. The distribution of responses changed significantly after students viewed the animation. Sanger, Michael J.; Campbell, Eddie; Felker, Jeremy; Spencer, Charles. J. Chem. Educ.2007, 84, 875.
