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Di Vincenzo, Antonella; Floriano, Michele A. – Journal of Chemical Education, 2020
An application for visualizing the dynamic properties of an equimolar binary mixture of isotropic reactive particles is presented. By introducing a user selectable choice for the activation energy, the application is useful to demonstrate qualitatively that the reaction rate depends on the above choice and on temperature. The application is based…
Descriptors: High School Students, Undergraduate Students, Molecular Structure, Chemistry
Caspari, I.; Kranz, D.; Graulich, N. – Chemistry Education Research and Practice, 2018
Research in organic chemistry education has revealed that students often rely on rote memorization when learning mechanisms. Not much is known about student productive resources for causal reasoning. To investigate incipient stages of student causal reasoning about single mechanistic steps of organic reactions, we developed a theoretical framework…
Descriptors: Organic Chemistry, Science Instruction, Logical Thinking, Scientific Principles
Goldston, M. Jenice; Pan, Shanlin; Boykin, Karen; Allison, Elizabeth; Wehby, Scott – Science Teacher, 2016
Nanoscience development affects almost every discipline of science, engineering, and technology. Not surprisingly, "the science of small" is also finding its way into science classrooms. In general, "nano" refers to a billionth of a meter--about 1/50,000 the width of a hair follicle. The term "nanoparticle" usually…
Descriptors: Molecular Structure, Technology, Chemistry, Science Instruction
Young, Clive – School Science Review, 2017
Matter can be described and explained in a number of ways, using models of increasing complexity depending on the intended audience. Under the current National Curriculum for England, the kinetic theory of matter is taught to 11- and 12-year-olds in secondary schools to explain the structure of solids, liquids and gases and their behaviour when…
Descriptors: Science Instruction, Secondary School Science, National Curriculum, Scientific Principles
Raff, Lionel M. – Journal of Chemical Education, 2014
The thermodynamic criteria for spontaneity and equilibrium in multireaction systems are developed and discussed. When N reactions are occurring simultaneously, it is shown that G and A will depend upon N independent reaction coordinates, ?a (a = 1,2, ..., N), in addition to T and p for G or T and V for A. The general criteria for spontaneity and…
Descriptors: Science Instruction, Chemistry, Thermodynamics, Scientific Principles
Erceg, Nataša; Aviani, Ivica; Mešic, Vanes; Gluncic, Matko; Žauhar, Gordana – Physical Review Physics Education Research, 2016
In this study, we investigated students' understanding of concepts related to the microscopic model of gas. We thoroughly reviewed the relevant literature and conducted think alouds with students by asking them to answer open-ended questions about the kinetic molecular theory of gases. Thereafter, we transformed the open-ended questions into…
Descriptors: Foreign Countries, Scientific Concepts, Natural Resources, Concept Formation
Lolur, Phalgun; Dawes, Richard – Journal of Chemical Education, 2014
Additive manufacturing, commonly known as 3D printing, is gaining popularity in a variety of applications and has recently become routinely available. Today, 3D printing services are not only found in engineering design labs and through online companies, but also in university libraries offering student access. In addition, affordable options for…
Descriptors: Science Instruction, College Science, Undergraduate Study, Chemistry
Pieraccini, M.; Selleri, S. – Physics Education, 2013
Catt's anomaly is a sort of "thought experiment" (a "gedankenexperiment") where electrons seem to travel at the speed of light. Although its author argued with conviction for many years, it has a clear and satisfactory solution and it can be considered indubitably just an apparent paradox. Nevertheless, it is curious and…
Descriptors: Science Instruction, Physics, Science Experiments, Molecular Structure
Redzic, Dragan V. – European Journal of Physics, 2012
Charges and fields in a straight, infinite, cylindrical wire carrying a steady current are determined in the rest frames of ions and electrons, starting from the standard assumption that the net charge per unit length is zero in the lattice frame and taking into account a self-induced pinch effect. The analysis presented illustrates the mutual…
Descriptors: Scientific Concepts, Science Instruction, Physics, Energy
Sweeney, William; Lee, James; Abid, Nauman; DeMeo, Stephen – Journal of Chemical Education, 2014
An experiment is described that determines the activation energy (E[subscript a]) of the iodide-catalyzed decomposition reaction of hydrogen peroxide in a much more efficient manner than previously reported in the literature. Hydrogen peroxide, spontaneously or with a catalyst, decomposes to oxygen and water. Because the decomposition reaction is…
Descriptors: Science Instruction, Science Experiments, Energy, Scientific Principles
Kirschenbaum, Louis J.; Ruekberg, Ben – Journal of Chemical Education, 2012
Our previous work correlated bond angles of group V and group VI hydrides (AH[subscript 3]E and AH[subscript 2]E[subscript 2], respectively, where E represents a lone electron pair) to the electronegativities of the atoms using the fraction of s character to relate the two. Here we have extended the correlation to the AH[subscript 2]X[subscript 2]…
Descriptors: Science Instruction, College Science, Scientific Principles, Correlation
Koutandos, Spyridon – European Journal of Physics Education, 2012
In this article we discuss the concept of equilibrium establishment in four most usual instances as is electrostriction and vaporization as related to the concept of equilibrium shell formation. Two more cases are then studied which are of relevance. One is the Brownian movement, the study of which is essential for pedagogical reasons as to…
Descriptors: Science Instruction, Physics, Energy, Scientific Concepts
Laursen, Anders B.; Varela, Ana Sofia; Dionigi, Fabio; Fanchiu, Hank; Miller, Chandler; Trinhammer, Ole L.; Rossmeisl, Jan; Dahl, Soren – Journal of Chemical Education, 2012
The electrochemical hydrogen evolution reaction (HER) is growing in significance as society begins to rely more on renewable energy sources such as wind and solar power. Thus, research on designing new, inexpensive, and abundant HER catalysts is important. Here, we describe how a simple experiment combined with results from density functional…
Descriptors: Chemistry, Energy, Energy Conservation, Science Instruction
Flener-Lovitt, Charity – Journal of Chemical Education, 2014
A thematic course called "Climate Change: Chemistry and Controversy" was developed for upper-level non-STEM students. This course used the socioscientific context of climate change to teach chemical principles and the nature of science. Students used principles of agnotology (direct study of misinformation) to debunk climate change…
Descriptors: Science Instruction, College Science, Undergraduate Study, Teaching Methods
Pappenfus, Ted M.; Schliep, Karl B.; Dissanayake, Anudaththa; Ludden, Trevor; Nieto-Ortega, Belen; Lopez Navarrete, Juan T.; Ruiz Delgado, M. Carmen; Casado, Juan – Journal of Chemical Education, 2012
A series of experiments for undergraduate courses (e.g., organic, physical) have been developed in the area of small molecule organic materials. These experiments focus on understanding the electronic and redox properties of a donor-acceptor molecule that is prepared in a convenient one-step microscale reaction. The resulting intensely colored…
Descriptors: Chemistry, Science Instruction, College Science, Undergraduate Study