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Showing 1 to 15 of 35 results Save | Export
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Ciccioli, Andrea; Glasser, Leslie – Journal of Chemical Education, 2011
For most materials, the solid at and near the triple-point temperature is denser than the liquid with which it is in equilibrium. However, for water and certain other materials, the densities of the phases are reversed, with the solid being less dense. The profound consequences for the appearance of the "pVT" diagram of one-component materials…
Descriptors: Chemistry, Science Instruction, Water, Visual Aids
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Coursindel, Thibault; Martinez, Jean; Parrot, Isabelle – Journal of Chemical Education, 2010
In this laboratory activity, students are introduced to a three-step synthesis of hydantoin (imidazolidine-2,4-dione), a moiety that is found in many biologically active compounds. Using a microwave oven and solid-support technology, this synthetic experiment is designed for masters-degree candidates working in organic chemistry or upper-level…
Descriptors: Organic Chemistry, Science Instruction, Science Laboratories, Biology
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Bhattacharya, Apurba; Purohit, Vikram C.; Bellar, Nicholas R. – Journal of Chemical Education, 2004
High-pressure liquid chromatography (HPLC) is the preferred method of separating a variety of materials in complex mixtures such as pharmaceuticals, polymers, soils, food products and biological fluids and is also considered to be a powerful analytical tool in both academia and industry. The use of HPLC analysis as a means of monitoring and…
Descriptors: Chemistry, Scientific Methodology, Science Education, Industry
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Glasser, Leslie – Journal of Chemical Education, 2009
We present equations of state relating the phases and a three-dimensional phase diagram for ammonia with its solid, liquid, and vapor phases, based on fitted authentic experimental data and including recent information on the high-pressure solid phases. This presentation follows similar articles on carbon dioxide and water published in this…
Descriptors: Chemistry, Visual Aids
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Limpanuparb, Taweetham; Kanithasevi, Siradanai; Lojanarungsiri, Maytouch; Pakwilaikiat, Puh – Journal of Chemical Education, 2019
We discuss the use of a simple piece of equipment made of a 50 mL syringe attached to a 2 mL graduated pipet to demonstrate Boyle's law and Charles's law. A plot of the hydrostatic pressure against the reciprocal of the volume of the gas read from the equipment is linear as discussed in the paper and gives the atmospheric pressure at the…
Descriptors: Science Instruction, Science Experiments, Science Laboratories, Laboratory Experiments
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McGregor, Donna; Sweeney, William V.; Mills, Pamela – Journal of Chemical Education, 2012
A simple and inexpensive mercury-free apparatus to measure the change in volume of a gas as a function of pressure at different temperatures is described. The apparatus is simpler than many found in the literature and can be used to study variations in pressure, volume, and temperature. (Contains 1 table and 7 figures.)
Descriptors: Climate, Chemistry, Science Laboratories, Scientific Concepts
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Johnson, Michael R. – Journal of Chemical Education, 2006
In most general chemistry and introductory physical chemistry classes, critical point is defined as that temperature-pressure point on a phase diagram where the liquid-gas interface disappears, a phenomenon that generally occurs at relatively high temperatures or high pressures. Two examples are: water, with a critical point at 647 K (critical…
Descriptors: Chemistry, Thermodynamics, Science Instruction, College Students
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Suvachittanont, Surapong – Journal of Chemical Education, 1983
Describes use of activation volumes derived from the effect of pressure reaction rates in aiding the understanding of reaction mechanism. Topics discussed include determination and interpretation of activation volumes, high pressure equipment/techniques, and application of activation volumes in mechanistic elucidation of several inorganic…
Descriptors: Chemical Reactions, Chemistry, College Science, Higher Education
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Beaver, Rodney W.; And Others – Journal of Chemical Education, 1983
Describes an experiment on the qualitative analysis of several over-the-counter analgesic tablets. Background information, procedures used (including high pressure liquid chromatography), and typical student results are included. (JN)
Descriptors: Chemical Analysis, Chemistry, Chromatography, College Science
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Chan, W. F.; Lin, C. W. – Journal of Chemical Education, 2007
An HPLC undergraduate experiment on the analysis of traditional Chinese medicine (TCM) has been developed. Two commonly used herbs ("glycyrrhizae radix" and "cinnamomi ramulus") are studied. Glycyrrhizin, cinnamic acid, and cinnamaldehyde are chosen as markers for the herbs. The dried herbs in their natural state and a TCM…
Descriptors: Chemistry, Medicine, Undergraduate Study, Plants (Botany)
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Cloonan, Carrie A.; Andrew, Julie A.; Nichol, Carolyn A.; Hutchinson, John S. – Journal of Chemical Education, 2011
This article describes an activity that can be used as an inquiry-based laboratory or demonstration for either high school or undergraduate chemistry students to provide a basis for understanding both vapor pressure and the concept of dynamic phase equilibrium. The activity includes a simple setup to create a closed system of only water liquid and…
Descriptors: Chemistry, Inquiry, Active Learning, Science Experiments
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O'Connor, Kenneth J.; Zuspan, Kimberly; Berry, Lonnie – Journal of Chemical Education, 2011
Hydrogenation of alkenes is an important reaction in the synthesis of organic molecules. In this experiment, students conduct a high-yield microscale hydrogenation reaction of methyl "trans"-cinnamate using a readily available, safe, and convenient hydrogen source. The conditions are similar to those seen in an organic chemistry textbook for an…
Descriptors: Reaction Time, Organic Chemistry, Undergraduate Study, College Science
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Qvit, Nir; Barda, Yaniv; Gilon, Chaim; Shalev, Deborah E. – Journal of Chemical Education, 2007
This laboratory experiment provides a unique opportunity for students to synthesize three analogues of aspartame, a commonly used artificial sweetener. The students are introduced to the powerful and useful method of parallel synthesis while synthesizing three dipeptides in parallel using solid-phase peptide synthesis (SPPS) and simultaneous…
Descriptors: Chemistry, Laboratory Experiments, Teaching Methods, Spectroscopy
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Rodgers, V. E.; Angell, C. A. – Journal of Chemical Education, 1983
Describes an optical cell, suitable for high-pressure studies between at least -130 and +150 degrees Celsius, which may be assembled for about $50. Discusses experimental demonstration of principles involved when using the apparatus, including effects of pressure on coordination of ions in solution and on reaction rates in solution. (JN)
Descriptors: Chemical Equilibrium, Chemical Reactions, Chemistry, College Science
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Boatwright, Adrian L.; Puttick, Simon; Licence, Peter – Journal of Chemical Education, 2011
Used since the time of the ancient Egyptians as a method for transferring liquids from one vessel to another, the siphon is a dependable tool. Although, the act of siphoning beer from a fermentation barrel or wine from a demijohn is a skill that has been passed down from generation to generation, do we really know how the siphon works? It is…
Descriptors: Secondary School Science, Science Instruction, Scientific Principles, Science Experiments
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