A modified apparatus for measuring surface tension with the bubble-pressure method is proposed. Compared with a traditional instrument, this apparatus improved the accuracy of maximum pressure difference measurement and achieved the hydrostatic pressure correction. The apparatus was employed to determine the surface tension values of distilled…

In a well-known bronze plating experiment, a Cu coupon is subjected to Sn plating and heating with a Bunsen burner. Currently, aqueous NaOH or HCl is typically used as the plating solution; however, the use of a strong acid or base provides operational risks, particularly in educational settings (e.g., schools). Herein, we introduce a modified…

An undergraduate laboratory experiment for the synthesis of biologically significant bis-4-hydroxycoumarins using a new catalyst is described here. An experimental setup plan, monitoring the reaction by TLC, isolation of the product, safe laboratory handling procedures, and significance of data reproducibility of the result are the main learning…

A laboratory experiment was developed to introduce undergraduate chemistry students to the chemical characterization of agroindustrial waste extracts by gas chromatography-mass spectrometry (GC--MS). The students prepared hexane and dichloromethane extracts from black pepper ("Piper nigrum" L.) waste. GC--MS analysis revealed the…

Joseph Priestley, discoverer of oxygen, lived in Nantwich, Cheshire, UK, from 1758 to 1761. In 2019, an exhibition featuring his life and achievements, and also celebrating the International Year of the Periodic Table, was developed by the Nantwich Museum. The historical research of Priestley's life, development of the exhibition, and rationale…

The liquid nitrogen cloud demonstration is an effective, dramatic, large-scale demonstration to illustrate gas laws and cloud/fog (aerosol) formations for classes and large-scale outreach events. When performed at full scale, it is common to produce a cloud 20-30 feet in height. Its effect can be further enhanced by adding brightly colored…

Reaction coordinate diagrams (RCDs) are an important tool used to visualize the energetics of a chemical reaction. RCDs provide information about the kinetics of the reaction, the mechanism by which the reaction occurs, and the relative thermodynamic stability of the molecules in a reaction. Previous research studies have characterized student…

Artificial intelligence (AI) is receiving a lot of attention in various fields. There is a need for educating students in AI technology. In this context, we have created a new type of carbon dioxide fountain by integrating AI with the well-established Arduino-carbon dioxide fountain experiment. This experiment consists of an Arduino…

The role of science teachers in the formation of students' approaches to chemistry subjects is very important. Metaphors can be used as a data collection tool to determine what meanings science teachers, who are preparing to step into the teaching profession, attribute to some concepts. It is important to know how chemistry is perceived by science…

A handheld refractometer (HHR) is a versatile instrument in the chemistry lab or in the workplace. It is also inexpensive enough (<$25 U.S.) that all students in a chemistry lab can have one or students completing laboratories remotely can purchase one. We report four applications of two different HHRs: one HHR for which the scale reads…

This experimental lab set is for students taking college chemistry courses. It includes four laboratory works and completely illustrates the important parts of chemical kinetics, namely the determination of the rate constant and the determination of the factors influencing its value. They can be used in a laboratory set for a physical chemistry…

A short course for high school students was converted from a two-week, in-person laboratory course to a remote and virtual four-week course due to the COVID-19 pandemic. Students met virtually each day to participate in activities that included the following: presentations, demonstrations, interviews, group discussions, lessons, and virtual tours…

Active learning and student-centered learning are becoming the preferred teaching approach in higher education. Once heavily based on lectures, science instructors are adopting new teaching methods to promote active learning. Lecture-based courses can be modified to increase student engagement by including in-class discussions, activities, and…

Chemical screening libraries often feature natural product extracts (NPEs) due to the intriguing biological activities they possess and the structural diversity found in their individual components. A research project originally designed to create an extract library of every specimen in the University of Rhode Island (URI) Heber W. Youngken Jr.…

The published study of Nurrenbern and Pickering in 1987 raises awareness among chemistry educators that students' success in answering numerical questions does not necessarily reflect their degree of understanding of the related chemical concepts. Efforts have been made to provide more opportunities for students to improve their ability in…