Since at least the 1960s, organic chemistry textbooks have featured pK[subscript a] tables for organic acids that include values for H[subscript 2]O and H[subscript 3]O[superscript +] (15.74 and -1.74, respectively) that are thermodynamically and chemically indefensible. Here we trace this error back to Brønsted's early contributions in the 1920s…

This study examines whether the use of oral drills and role-play method could improve students' interactive speaking achievement. This study used quantitative research using pre-experimental method with one group pre and posttest design. The study was conducted in SMP Advent II, Setia Budi, Bandung. The participants of this study were 30 students…

Species TOPOS is a free software package for generating three-dimensional (3-D) topographic surfaces ("topos") for acid-base equilibrium studies. This upgrade adds 3-D species distribution topos to earlier surfaces that showed pH and buffer capacity behavior during titration and dilution procedures. It constructs topos by plotting…

This lab experiment uses [superscript 31]P NMR spectroscopy of biomolecules to determine pK[subscript a] values and the binding energies of metal/biomolecule complexes. Solutions of adenosine nucleotides are prepared, and a series of [superscript 31]P NMR spectra are collected as a function of pH and in the absence and presence of magnesium or…

The purpose of this study was to determine the effect of using smartphones for online learning on teachers' and students' interactions in learning that occurred during the COVID-19 pandemic. Respondents were 303 elementary school students, randomly selected by filling out questions through a Google form application. 20 items were provided, 10…

Mokken models have recently started to become the preferred method of researchers from different fields in studies of nonparametric item response theory (NIRT). Despite increasing application of these models, some features of this type of modelling need further study and explanation. Invariant item ordering (IIO) is one of these areas, which the…

Images of teacher evaluation (and teacher value) represented through scores, which are plotted on charts and widely reported, have had a profound impact on how society views teachers' contributions, capacities, and worth and have, in turn, influenced school policies and practices. Drawing on a broader multimodal study, this article opens up a…

In the centenary of the death of Patrick Henry Pearse--one of the leaders of Ireland's 1916 Rebellion--it is interesting to reflect on the relevance of his writing for contemporary approaches to lifelong and lifewide learning. Pearse's essay "The Murder Machine" was forged within the tradition of progressive education movements in the…

Isothermal titration calorimetry was used to experimentally determine thermodynamic values for the ethylenediaminetetraacetic acid (EDTA)(aq) + M[superscript 2+](aq) reactions (M[superscript 2+] = Ca[superscript 2+] and Mg[superscript 2+]). Students showed that for reactions in a N-(2-hydroxyethyl)piperazine-N"-ethanesulfonic acid (HEPES)…

Objective: The present study explored the outcomes of a positive youth development (PYD) program entitled "Project P.A.T.H.S." based on a total of 12,281 Chinese adolescents in Hong Kong. Method: To understand the impact of this program, the study assessed the changes in developmental outcomes using a single group pretest and posttest…

This experiment describes a simple protocol for teaching acid-base titrations using potentiometry, conductivity, and/or photometry to determine end points without an added indicator. The chosen example examines the titratable acidity of a red wine with NaOH. Wines contain anthocyanins, the colors of which change with pH. Importantly, at the…

All pH calculations for simple acid-base systems used in introductory courses on general or analytical chemistry can be carried out by using a general procedure requiring the use of predominance diagrams. In particular, the pH is calculated as the sum of an independent term equaling the average pK[subscript a] values of the acids involved in the…

For many students biochemistry is a demanding course because they are expected to apply previously learned foundational concepts to new biological contexts. These foundational concepts serve as a scaffold onto which to build threshold concepts such as the physical basis of interactions. Unfortunately, many students possess misconceptions or gaps…

Undergraduate research is often regarded as the most powerful high impact practice because it encompasses several high impact practice strategies (e.g. faculty-student mentorship, collaborative learning, common intellectual experiences) within one experience. First-generation college Students of Color are often excluded from undergraduate research…

The study aimed to investigate the Emotional Intelligence (EI) and its relationship with self-efficacy among primary school teachers. The study was conducted to determine whether primary school teachers develop their EI that would increase their levels of self-efficacy. The participants of the study were composed of 118 primary school teachers.…