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Direct linkPriya Boora; Leah C. Zohner; Martha D. Morton; Chin Li Cheung – Journal of Chemical Education, 2025
This study reports an undergraduate laboratory experiment that explores the temperature-dependent kinetics of caffeine release during tea steeping by using quantitative [superscript 1]H NMR spectroscopy with a water suppression pulse sequence. Designed for introductory organic chemistry laboratory courses, the experiment emphasizes the real-world…
Descriptors: Science Instruction, Undergraduate Study, Science Laboratories, Laboratory Experiments
Michelle Lee; Nathan J. Vosburg; Emily A. Shimizu; Manuel A. Renteri´a-Go´mez; Roci´o Ga´mez-Montan~o; David A. Vosburg – Journal of Chemical Education, 2022
A new undergraduate organic laboratory experiment has been developed and implemented for the Ugi three-component synthesis of the topical anesthetic lidocaine with excellent atom economy. Paraformaldehyde, diethylamine, and 2,6-dimethylphenyl isocyanide were combined and conveniently stirred at room temperature for a week in methanol with acetic…
Descriptors: Undergraduate Study, Organic Chemistry, Laboratory Experiments, Climate
Gomez, Elaine; Paul, Melissa; Como, Charles; Barat, Robert – Chemical Engineering Education, 2014
This experiment and analysis offer an effective experience in greenhouse gas reduction. Ammoniated water is flowed counter-current to a simulated flue gas of air and CO2 in a packed column. The gaseous CO2 concentrations are measured with an on-line, non- dispersive, infrared analyzer. Column operating parameters include total gas flux, dissolved…
Descriptors: Science Experiments, College Science, Science Laboratories, Undergraduate Study
Tellinghuisen, Joel – Journal of Chemical Education, 2010
Liquid-vapor, solid-vapor, and solid-liquid-vapor equilibria are studied for the pure substance water, using modern equipment that includes specially fabricated glass cells. Samples are evaporatively frozen initially, during which they typically supercool to -5 to -10 [degrees]C before spontaneously freezing. Vacuum pumping lowers the temperature…
Descriptors: Chemistry, Climate, Science Instruction, Teaching Methods
Mitchell, Joseph D.; Petrov, Nikola P. – European Journal of Physics, 2009
We apply several physical ideas to determine the steady temperature distribution in a medium moving with uniform velocity between two infinite parallel plates. We compute it in the coordinate frame moving with the medium by integration over the "past" to account for the influence of an infinite set of instantaneous point sources of heat in past…
Descriptors: Physics, Climate, Motion, Science Instruction
Browne, Kerry P.; Laws, Priscilla W. – Physics Education, 2003
We are developing a new activity-based unit on global warming and the environment as part of the "Explorations in Physics Curriculum." We describe the current status of this unit, which focuses on helping students understand the greenhouse effect and its relationship to global warming. We outline several problems encountered in testing the unit…
Descriptors: Population Growth, Climate, Earth Science, Physics
