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Dauzvardis, Fabian; Lisensky, George – Journal of Chemical Education, 2021
Ion-selective electrodes are among the oldest and most important potentiometric sensing methods. In this experiment, students assemble their own reusable ion-selective electrode from glass tubes with an attached PTFE membrane, [(CH[subscript 3]CH[subscript 2]CH[subscript 2]CH[subscript 2]CH[subscript 2]CH[subscript 2]CH[subscript 2]CH[subscript…
Descriptors: Chemistry, Measurement Equipment, Science Activities, Laboratory Equipment
Lisensky, George; Dauzvardis, Fabian; Jacquez, Tess – Journal of Chemical Education, 2021
Chemical energy storage and use is a critical part of a sustainable world. In this laboratory experiment, students construct and use an inexpensive hydrogen fuel cell to power a calculator or a clock. The reusable cells are prepared from plastic syringes and a nickel mesh that is coated with a palladium metal catalyst by electroless deposition.…
Descriptors: Energy, Introductory Courses, Chemistry, Science Experiments
Lisensky, George C.; Dauzvardis, Fabian; Young, Megan M. K. – Journal of Chemical Education, 2021
For solid solutions with the same arrangement of atoms, the size of a unit cell depends on the size of the atoms in the unit cell. The distance between nuclei also helps determine how strongly electrons are held, which changes the band gap energy. Samples of semiconductor CH[subscript 3]NH[subscript3]Pb(I[subscript…
Descriptors: Chemistry, Molecular Structure, Electronic Equipment, Energy
Dauzvardis, Fabian; Knapp, Alexander; Shein, Kaung Nan Dar; Lisensky, George – Journal of Chemical Education, 2020
In this brief experiment, students create a superhydrophobic surface as an application of polar--nonpolar interactions and redox chemistry. Half of a zincgalvanized steel strip is coated in copper nanoparticles through electroless deposition. A layer of nonpolar octadecanethiol is added to half of that copper surface. Students classify the three…
Descriptors: Science Instruction, Science Experiments, Chemistry, Undergraduate Study
Lisensky, George; Dauzvardis, Fabian; Luo, Jiaqi; Horger, Jacob; Koenig, Emma – Journal of Chemical Education, 2020
Polymers and nanochemistry are important facets of chemistry. In this experiment, students synthesize monodispersed poly(methyl methacrylate) nanospheres from the addition or chain polymerization of a rapidly stirred aqueous mini-emulsion of methyl methacrylate. The 2,2'-azobis(2-methylpropionamidine) dihydrochloride serves as a heat activated,…
Descriptors: Science Instruction, Chemistry, Scientific Concepts, Molecular Structure