Purpurogallin (PPG), an orange-red crystalline compound from nutgalls and oak bark, is an exemplar of numerous, ubiquitous natural colorants, biosynthesized through oxidative dimerization-decarboxylation of phenolic compounds. It possesses antioxidant, anticancer, and anti-inflammatory effects. Herein, a robust method is presented to allow…

Potash, an essential raw material of the 18th century, used to be produced from the ashes of plants. Known since antiquity, it was in 1807 that Humphry Davy put an end to the decades-long controversy about its nature as a compound. The technology behind potash production was implemented in Brazil by the Portuguese naturalist Frei Velloso. The…

As a member of the team that created elements 104 and 105 at Lawrence Berkeley Laboratory, James Andrew Harris [1932-2000] was the first African American credited in the discovery of an element. This factoid has been posted on social media, used in a quiz game, and repeated on numerous Web sites. The story (if any context is offered at all) is…

Over 200 years ago, Alessandro Volta published his observations of a steady voltage when a piece of electrolyte-soaked cardboard was sandwiched between two dissimilar metals. This observation initiated a century of argument as to the origin of voltaic electricity (contact vs chemical) and catalyzed practical advances, such as the first…

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…

Metabolism is a challenging subject for bioscience students due to the intrinsic complexity of the metabolic network, as well as that of the overlapping mechanisms of metabolic regulation. Collaborative learning based on a problem-based learning approach can help students to successfully learn and understand metabolism. In the present article, we…

The long and complex history to define the composition of water as H[subscript 2]O is summarized. This case study could be useful not only to introduce the history of chemistry in the classroom but also to teach the basic tenets of the nature of science (NOS). Water has been present in several turning points in the history of chemistry such as the…

Knowing about the evolution of atomic models throughout history is a fundamental topic to learn about atomic structure. This paper describes how identifying keywords from a musical YouTube video provides a stimulating activity for learning this topic in a chemistry class in middle school. The main goal was to show how a fun and interesting…

This article describes three historical cases of drug discovery and how they were adapted as examples to teach chemical analysis to students pursuing a pharmacy (UK MPharm) and pharmaceutical sciences (BSc Pharmaceutical Sciences) degree. The selected cases were the synthesis of benzodiazepines and the discovery of warfarin and neuromuscular…

Oscillating chemical reactions in the homogeneous phase have been studied intensively only since the mid-1960s, but they were known since 1920, having as forerunners the chemist William C. Bray and an "atypical" chemist Alfred J. Lotka. This contribution is the result of a careful reading of their literature and patient research into…

The pandemic COVID-19 has brought the closure of schools of all levels and all universities in Italy, since early March 2020 up to the end of the teaching period (first half of June 2020). However, almost all universities guaranteed the continuity of educational and professional courses by using several distance education modalities. The purpose…

Shot noise is one of the essential concepts in instrumental analysis, which places a fundamental limit on quantitative measurements when the magnitude of the analytical signal is very small. The introduction of an abstract scientific concept with a brief historical perspective often shows the human side of science. In the scientific literature,…

The Committee on Polymer Education (PolyEd) had its initial planning meeting in 1974. The Intersociety Polymer Education Council (IPEC) has been active since 1990 as an outgrowth of PolyEd. Because of the activities of PolyEd and IPEC, basic polymer concepts have become a required part of undergraduate education and a more common topic in the…

The visualization of latent fingerprints often involves the use of a chemical substance that creates a contrast between the fingerprint residues and the surface on which the print was deposited. The chemical-aided visualization techniques can be divided into two main categories: those that chemically react with the fingerprint residue and those…

We present ideas about how to incorporate discussion of a paintings collection in chemistry classrooms. Specifically, it is a collection of paintings that have illustrated calendars since 1900, from a traditional Spanish explosives company (founded by Alfred Nobel and now known as Maxam). The case is discussed in relation to the "chemistry in…