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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
Dean J. Campbell; Thomas S. Kuntzleman; Kayla Lippincott; Abe Yassin; Khitab Dar; Q. Ott – Journal of Chemical Education, 2023
The relationship between surface area and dynamics of processes can be demonstrated by adding iron at room temperature to liquid nitrogen. The rate at which the liquid nitrogen boils to produce gas is related to the surface area of the iron. Adding iron in the form of consistent units that have measurable sizes can be readily connected to…
Descriptors: Metallurgy, Mathematical Concepts, Science Education, Scientific Concepts
Peer reviewedSommers, Trent S.; Nahir, Tal M. – Journal of Chemical Education, 2005
Theoretical and experimental evidence for the dependence of viscosities of the real gases on temperature is described, suggesting that this dependence is greater than that predicted by the kinetic theory of gases. The experimental results were obtained using common modern instrumentation and could be reproduced by students in analytical or…
Descriptors: Physics, Laboratory Experiments, Climate, Chemistry
