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Journal Articles: 21 results
Melting Point and Molecular Symmetry  R. J. C. Brown and R. F. C. Brown
In 1882 Thomas Carnelley observed that high molecular symmetry is associated with high melting point. The application of the rule to a number of different molecular crystals is discussed. The rule applies to different categories of crystal for different reasons, which can be explained by thermodynamic analysis.
Brown, R. J. C.; Brown, R. F. C. J. Chem. Educ. 2000, 77, 724.
Liquids |
Molecular Properties / Structure |
Phases / Phase Transitions / Diagrams |
Solids |
Thermodynamics |
Physical Properties |
Aromatic Compounds |
Crystals / Crystallography
Reply to Inflection at the Triple Point  Myers, R. Thomas
Response to challenges in graphing the triple point of water and correction to original article.
Myers, R. Thomas J. Chem. Educ. 2000, 77, 160.
Phases / Phase Transitions / Diagrams |
Physical Properties |
Water / Water Chemistry
Inflection at the Triple Point  Myers, R. Thomas
Challenges in graphing the triple point of water.
Myers, R. Thomas J. Chem. Educ. 2000, 77, 160.
Phases / Phase Transitions / Diagrams |
Physical Properties |
Water / Water Chemistry
Letters  
Challenges in graphing the triple point of water.
J. Chem. Educ. 2000, 77, 160.
Phases / Phase Transitions / Diagrams |
Physical Properties |
Water / Water Chemistry
A Discussion of the Term "Polymorphism"  Reinke, Helmut; Dehne, Heinz; Hans, Martin
Authors propose an extended definition for the term "polymorphism", especially in low molecular weight compounds.
Reinke, Helmut; Dehne, Heinz; Hans, Martin J. Chem. Educ. 1993, 70, 101.
Physical Properties |
Liquids |
Phases / Phase Transitions / Diagrams |
Solids |
Enrichment / Review Materials |
Hydrogen Bonding
A computer-aided optical melting point device  Masterov, Michael; Pierre-Louis, Bredy; Chuang, Raymond
The device should improve the precision of these determinations by eliminating human judgement from the process.
Masterov, Michael; Pierre-Louis, Bredy; Chuang, Raymond J. Chem. Educ. 1990, 67, A75.
Phases / Phase Transitions / Diagrams |
Physical Properties
Molecular association and structure of hydrogen peroxide  Gigure, Paul A.
The typical textbook treatment of molecular association and structure of hydrogen peroxide, and the implications of these concepts for the physical properties of hydrogen peroxide tend to be oversimplified and inaccurate.
Gigure, Paul A. J. Chem. Educ. 1983, 60, 399.
Molecular Properties / Structure |
Physical Properties |
Phases / Phase Transitions / Diagrams |
Hydrogen Bonding
Preparation of solid derivatives by differential scanning calorimetry  Crandall, E. W.; Pennington, Maxine
Derivatives of alcohols, amines, phenols, aldehydes, ketones, and haloalkanes are prepared and their phase transitions observed using a differential scanning calorimeter.
Crandall, E. W.; Pennington, Maxine J. Chem. Educ. 1980, 57, 824.
Phases / Phase Transitions / Diagrams |
Aldehydes / Ketones |
Alcohols |
Amines / Ammonium Compounds |
Phenols |
Physical Properties |
Calorimetry / Thermochemistry
The latent heat of vaporization of an organic solid: An undergraduate experiment  Khouw, B. H.; Pritchard, H. O.
A series of experiments based on a mass spectrometer to help students visualize the latent heat of vaporization for a relatively involatile solid.
Khouw, B. H.; Pritchard, H. O. J. Chem. Educ. 1975, 52, 730.
Phases / Phase Transitions / Diagrams |
Laboratory Equipment / Apparatus |
Physical Properties |
Mass Spectrometry |
Gas Chromatography
Phase changes of hexachloroethane  Shavitz, Richard
A demonstration of the sublimation of hexachloroethane.
Shavitz, Richard J. Chem. Educ. 1975, 52, 231.
Phases / Phase Transitions / Diagrams |
Physical Properties
An attachment for semiautomatic melting point determination  Vogel, George
This simple yet rugged device notifies the experimenter when a small crystalline sample in a capillary tube first begins to melt.
Vogel, George J. Chem. Educ. 1969, 46, 789.
Laboratory Equipment / Apparatus |
Phases / Phase Transitions / Diagrams |
Physical Properties |
Laboratory Management
Purification of low-melting compounds  Kaye, Irving Allan
Presents a procedure that addresses difficulties to purification by recrystallization caused by the tendency of some low-melting compounds to precipitate from solution as oils.
Kaye, Irving Allan J. Chem. Educ. 1969, 46, 696.
Phases / Phase Transitions / Diagrams |
Physical Properties |
Separation Science |
Crystals / Crystallography |
Solutions / Solvents |
Laboratory Management |
Precipitation / Solubility
Basic organic laboratory techniques and problem solving: The nitration of 4-nitrophenol  Pearson, Robert E.
The experiment described requires application of melting point data and the technique of recrystallization to identify the product of a simple chemical reaction.
Pearson, Robert E. J. Chem. Educ. 1969, 46, 692.
Physical Properties |
Phases / Phase Transitions / Diagrams |
Qualitative Analysis |
Phenols
Microboiling point determination at atmospheric pressure  Chaco, M. C.
This microboiling point determination uses a melting-point capillary
Chaco, M. C. J. Chem. Educ. 1967, 44, 474.
Phases / Phase Transitions / Diagrams |
Microscale Lab |
Physical Properties
Melting point depression  Di Pippo', Ascanio G.; Joseph, Miriam
The eutectic temperature of the piperonal / resorcinol system is well below room temperature.
Di Pippo', Ascanio G.; Joseph, Miriam J. Chem. Educ. 1965, 42, A413.
Physical Properties |
Phases / Phase Transitions / Diagrams
Melting point apparatus  Brown, Richard K.
Describes a simple melting point apparatus that relies on a soldering iron element for heat.
Brown, Richard K. J. Chem. Educ. 1965, 42, 433.
Phases / Phase Transitions / Diagrams |
Laboratory Equipment / Apparatus |
Physical Properties
A constant-level oil-bath melting point apparatus  Powell, H. B.; Mellon, E. K., Jr.; Burow, D. F.
Presents a modification of the Theile-Denis melting point apparatus.
Powell, H. B.; Mellon, E. K., Jr.; Burow, D. F. J. Chem. Educ. 1964, 41, 345.
Laboratory Equipment / Apparatus |
Phases / Phase Transitions / Diagrams |
Physical Properties
A simple melting-point apparatus  Gero, Alexander
The melting-point apparatus described in this paper is distinguished by extreme simplicity of construction and negligible cost.
Gero, Alexander J. Chem. Educ. 1954, 31, 645.
Laboratory Equipment / Apparatus |
Phases / Phase Transitions / Diagrams |
Physical Properties
A cheap hot stage  Kiplinger, C. C.
Describes an inexpensive air bath and its use in melting point determinations.
Kiplinger, C. C. J. Chem. Educ. 1954, 31, 33.
Laboratory Equipment / Apparatus |
Physical Properties |
Phases / Phase Transitions / Diagrams
A rapid method for routine checking of melting points  Hughes, Virgil E.
Offers a device and procedure for checking the melting points of ten samples simultaneously.
Hughes, Virgil E. J. Chem. Educ. 1951, 28, 479.
Phases / Phase Transitions / Diagrams |
Physical Properties |
Laboratory Equipment / Apparatus
An improved melting point apparatus  Nickels, J. E.
Describes an improved form of the Hershberg precision melting point apparatus.
Nickels, J. E. J. Chem. Educ. 1951, 28, 303.
Laboratory Equipment / Apparatus |
Physical Properties |
Phases / Phase Transitions / Diagrams