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Sofia F. Palme; Andrew H. Johnson; Graeme R. A. Wyllie – Journal of Chemical Education, 2024
A major challenge when designing new experiments for the general chemistry laboratory is introducing students to the necessary techniques while keeping the experiment engaging and accessible. This work presents a new multiweek activity designed to introduce students to advanced instrumentation in the form of high-performance liquid chromatography…
Descriptors: Chemistry, Science Education, Color, Food
Daniel F. McCain; Evelyn K. McCain – Journal of Chemical Education, 2024
The following activity was developed to allow students to actively participate in and measure the kinetics of a multistep process. Each group of students is given a stack of blank coloring pages, each with a rainbow design printed on it. Each student in a group is given a different color crayon and colors in their portion of the picture before…
Descriptors: Kinetics, Color, Visual Aids, Chemistry
Gold at the End of the Rainbow: A Simple and Colorful Modification of the Golden Penny Demonstration
Thomas S. Kuntzleman; Levi T. Hogan – Journal of Chemical Education, 2022
The "Golden Penny" demonstration is a popular experiment that involves treating copper coins with chemical reagents to form brass, an alloy of copper and zinc that has a golden color. Reported here is a very simple modification for forming golden color on copper coins that does not require the use of chemical reagents. Instead, golden…
Descriptors: Science Instruction, Science Experiments, Metallurgy, Chemistry
Thomas S. Kuntzleman; Andrea Matti; Dajena Tomco – Journal of Chemical Education, 2024
A mixture of salt water and isopropyl alcohol is immiscible, forming two separate liquids with the organic layer on top and aqueous layer on bottom. When universal indicator is added to such a mixture, all of the indicator compounds in the universal indicator preferentially dissolve in the alcohol--except for phenolphthalein at high pH. Mixtures…
Descriptors: Chemistry, Color, Science Education, Scientific Concepts
Simeen Sattar – Journal of Chemical Education, 2024
Lakes are artists' pigments made from colorants bound to an inert substrate, usually hydrated aluminum oxide. Before the late 19th century, lakes were made from natural pigments extracted from plants and insects, extracted either directly from the dyestuff or indirectly from waste materials generated in the manufacture of dyed textiles. The first…
Descriptors: Color, Science Experiments, Laboratory Experiments, Science Education
Michael J. Jenkins; Miranda A. Phillips; Zi-Ling Xue – Journal of Chemical Education, 2023
This experiment demonstrates that copper(II) chloride dihydrate (CuCl[subscript 2]·2H[subscript 2]O) in different solvents (acetone, isopropyl alcohol, or water) displays divergent colors and visible-near IR spectra. Both the reactions of these solutions with 2 equiv of sodium hydroxide (NaOH) and the direct solid-state reaction of CuCl[subscript…
Descriptors: Science Experiments, Laboratory Experiments, Scientific Concepts, College Science
Electrochemistry Under Microscope: Observing the Diffusion Layer and Measuring Diffusion Coefficient
Lida Khalafi; Nastaran Nikzad; Asayiel Alhajeri; Brandon Bacon; Karla Alvarado; Mohammad Rafiee – Journal of Chemical Education, 2023
The area near the electrode surface is called the diffusion layer, and to understand electrochemistry, it is crucial that students have a knowledge of the phenomena occurring at the diffusion layer. Here, we present a demonstration and activity to visualize and analyze the expansion of a micrometer-sized diffusion layer. The electrode process…
Descriptors: Science Education, Chemistry, Laboratory Equipment, Scientific Concepts
Jovica Todorov; Gregory S. McCarty; Leslie A. Sombers – Journal of Chemical Education, 2023
There is an increasing need for fundamental electrochemistry concepts to be taught in the undergraduate curriculum, given the broad applicability of electrochemical technologies in addressing a wide range of global issues from critical energy shortages to real-time medical diagnostics. However, many electrochemical concepts are often taught in…
Descriptors: Chemistry, Color, Undergraduate Study, College Science
Jaconiano, Yasmim R.; Goulart, Juliana S.; Barros, José C.; Michel, Ricardo C. – Journal of Food Science Education, 2021
It began in 1869, and today we have 118 elements listed in the Periodic table, thanks to Mendeleev's work. Carbon, hydrogen, oxygen, and nitrogen are elements presented in many organic compounds. Some of them can exhibit photophysical and photochemical properties. Herein, we proposed an easy to make an experiment in chemistry classes to connect…
Descriptors: Chemistry, Food, Color, Scientific Concepts
Cortel, Adolf – Physics Teacher, 2021
Chladni patterns are one of the most fascinating physics demonstrations. They can be produced very easily using commercially available apparatus based on metallic plates attached to a mechanical driver, similar to a loudspeaker without the membrane, and a signal generator. The figures are observed using sand sprinkled on the surface of the plate.…
Descriptors: Physics, Demonstrations (Educational), Visual Aids, Color
Chen, Yu; Kim, Hee Ra; Ahn, Yu Jin; Kim, Jung Bog – Physics Teacher, 2022
The laser pointer has been widely used to demonstrate some simple optics phenomena, like reflection, refraction, total reflection, and diffraction. However, the rays of laser light cannot be seen in the air because the scattered light is too weak. Many physics teachers use milk or smoke to visualize rays of laser light in physics labs, but it is…
Descriptors: Science Experiments, Physics, Optics, Light
Thomas S. Kuntzleman; Dean J. Campbell – Journal of Chemical Education, 2022
So-called "Color Wonder" markers contain colorless dyes that only display color when used to mark on special "Color Wonder" paper. These markers make use of leuco dyes that only develop color in the presence of acid. These markers provide science educators with a novel chemical system that can be implemented in inquiry-based…
Descriptors: Chemistry, Science Instruction, Science Experiments, Laboratory Experiments
Hanisch, C.; Ziese, M.; Oehme, W. – Physics Teacher, 2021
White light refracted by a glass edge or a prism might be split into the colors of the rainbow but, when restricted by a suitable arrangement of edges, might also yield a sequence of colors complementary to the rainbow. We studied the creation of these color fields experimentally with a setup consisting of RGB light-emitting diodes that cover all…
Descriptors: Science Instruction, Light, Color, Science Experiments
Meng Wang; Jingwen He; Wei Lei; Qianfu Luo; Wenjun Wu; Wei-Hong Zhu – Journal of Chemical Education, 2024
The essence of university courses lies in their scientific rigor, while the enjoyment of learning serves as a motivation. In this regard, we have developed a comprehensive experiment project by incorporating dithienylethene-based photochromic units into sensitizers for renewable energy, specifically dye-sensitized solar cells, through organic…
Descriptors: Undergraduate Study, Student Research, College Science, Scientific Concepts
Hugo Y. Samayoa-Oviedo; Emily Halpern; Samantha A. Mehnert; Julia Laskin – Journal of Chemical Education, 2022
The laboratory experiment presented here describes the use of a calcium ion-selective electrode (Ca-ISE) to determine the concentration of zinc in a supplement tablet. This approach was developed to show students how to expand the range of applications of Ca-ISE to enable the determination of metal ions other than Ca[superscript 2+]. To determine…
Descriptors: Laboratory Experiments, Chemistry, Medicine, Science Instruction