This letter comments on the paper "Analysis of Citric Acid in Beverages: Use of an Indicator Displacement Assay" ["J. Chem. Educ." 2010, 87 (8), 832-835 (EJ918557)]. Discrepancies in figures and host:indicator complex behavior are discussed and an alternative experimental protocol presented.

The lichen is an ideal subject for student study because it is omnipresent in school yards, easily collected and observed year-round, a pioneer of evolution on land, and a bioindicator of air pollution. After doing fieldwork on this unusual composite organism as an apprentice with a team of lichenologists, Sarah Thorne developed Learning Lichens.…

Because honeybees are so crucial to the ecosystems in which they exist, educating younger children on the usefulness and relative harmlessness of honeybees may be key to ensuring their survival among future generations. Described here is a unit that addresses the critical role of the honeybee in pollinating flowers using the 5E learning cycle…

This paper discusses the implementation of a two-stage hands-on technology learning activity, based on Dewey's learning experience theory that is designed to enhance preservice teachers' primary and secondary experiences in developing their competency to solve hands-on problems that apply science and mathematics concepts. The major conclusions…

A straightforward synthesis of 2-phenylimidazo[1,2-a]pyridine is described. The reaction is designed to demonstrate to students the preparation of a bridged N-heterocycle, in which the heteroatom occupies a bridgehead position. The product is obtained in moderate to high yield and is highly crystalline. The compound can be purified either by…

One of the topics students have understanding difficulties in science is pressure. The study investigates the effectiveness of an active-learning environment on the students' understanding of the concept of pressure. The sample consisted of 30 students from a public secondary school in Turkey. This study used a pre-test, post-test,…

We carried out a study of an instructional model that integrates flipped classroom with active learning, in-class activities into our biology course, using a mixed methods research design. According to the survey (n = 331), a majority of students found the flipped classroom engaging and helpful for class preparation and scheduling of learning.…

Within the science education community, it is widely accepted that quality science instruction is focused on knowledge construction and inquiry. The Ghanaian education system has many hallmark issues that inhibit such instruction, however, including a pervasive teacher-centred pedagogy, lack of laboratory materials, and minimal support systems for…

Due to the unique and advantageous physiochemical properties of nanoparticles, they have been increasingly incorporated into consumer products and emerging technologies. The manufacture, wear and tear of use, and disposal of these nano-enabled products will likely result in the release of nanoparticles into the environment. Unfortunately,…

This paper examines the differences and challenges encountered when trying to create informal blended (virtual and hands-on) engineering design STEM activities. It contrasts the creation of STEM activities for formal and informal learning environments, stressing that the differences extend far beyond the length of the activity or depth of any…

In light of extensive research demonstrating widespread misconceptions about electricity, this paper describes a learning study that targeted the most likely source of difficulty--failure of middle school pupils to develop a mental model that serves as a bridge between static and current electricity. During the intervention, pupils first envision…

As effective methods to foster students' understanding of scientific models in science education are needed, increased reflection on thinking about models is regarded as a relevant competence associated with scientific literacy. Our study focuses on the influence of model-based approaches (modeling vs. model viewing) in an out-of-school laboratory…

Students with disabilities spend the majority of their day in the general education classroom (U.S. Department of Education 2017). However, these students consistently underperform in science. This highlights the importance of using effective differentiated instruction. According to Mastropieri and colleagues (2006), differentiated instruction…

The new approach to teaching science presented by the Next Generation Science Standards (NGSS) warrants training high-quality science, technology, engineering, and mathematics (STEM) teachers to prepare the future STEM workforce. We share the implementation of an energy lesson using a nanoscience approach, well-aligned with the NGSS vision, in a…

A low-cost and simple setup to measure the densities of liquids is introduced herein. The results and reliability of this setup were evaluated for pure liquids, water-ethanol binary mixtures, and aqueous NaCl solutions. The constructed densitometer provided density values with acceptable relative errors (less than ±3.0%), which were compared to…