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Harris, Jerry D.; Rusch, Aaron W. – Journal of Chemical Education, 2013
An experiment for analytical chemistry is presented that utilizes
simultaneous thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) to characterize colorless, hydrated salts with anhydrous melting points less than 1100 degrees C. The experiment could be used to supplement the lecture discussing gravimetric techniques. It is…
Descriptors: Chemistry, Thermodynamics, College Science, Science Laboratories
Mathabathe, Kgadi C.; Potgieter, Marietjie – Chemistry Education Research and Practice, 2014
The ability to make realistic judgments of one's performance is a demonstration of the possession of strong metacognitive skills. In this study we investigate the relationship between accuracy of self-evaluation as an expression of metacognitive skill, and learning gain in stoichiometry. The context is an academic development programme at a South…
Descriptors: Metacognition, Chemistry, Achievement Gains, Accuracy
Tang, Hui; Kirk, John; Pienta, Norbert J. – Journal of Chemical Education, 2014
This paper includes two experiments, one investigating complexity factors in stoichiometry word problems, and the other identifying students' problem-solving protocols by using eye-tracking technology. The word problems used in this study had five different complexity factors, which were randomly assigned by a Web-based tool that we developed. The…
Descriptors: Science Instruction, Science Experiments, Eye Movements, Stoichiometry
Kimberlin, Stephanie; Yezierski, Ellen – Journal of Chemical Education, 2016
Students' inaccurate ideas about what is represented by chemical equations and concepts underlying stoichiometry are well documented; however, there are few classroom-ready instructional solutions to help students build scientifically accurate ideas about these topics central to learning chemistry. An intervention (two inquiry-based activities)…
Descriptors: Stoichiometry, High School Students, Chemistry, Intervention
Chonkaew, Patcharee; Sukhummek, Boonnak; Faikhamta, Chatree – Chemistry Education Research and Practice, 2016
The purpose of this study was to investigate the analytical thinking abilities and attitudes towards science learning of grade-11 students through science, technology, engineering, and mathematics (STEM) education integrated with a problem-based learning in the study of stoichiometry. The research tools consisted of a pre- and post-analytical…
Descriptors: STEM Education, Critical Thinking, Cognitive Ability, Student Attitudes
Lanni, Laura M. – Journal of Chemical Education, 2014
A guided-inquiry lab, suitable for first-year general chemistry or high school advanced placement chemistry, is presented that uses only inexpensive, store-bought materials. The reaction of sodium bicarbonate (baking soda) with aqueous acetic acid (vinegar), under the constraint of the challenge to completely fill a sealable plastic bag with the…
Descriptors: Advanced Placement, Chemistry, College Science, Inquiry
Cotes, Sandra; Cotuá, José – Journal of Chemical Education, 2014
This article describes a method of instruction using an active learning strategy for teaching stoichiometry through a process of gradual knowledge building. Students identify their misconceptions and progress through a sequence of questions based on the same chemical equation. An infrared device and software registered as the TurningPoint Audience…
Descriptors: Science Instruction, Active Learning, Chemistry, Stoichiometry
Baranski, Andrzej – Journal of Chemical Education, 2012
Numerous articles have been published that address problems encountered in teaching basic concepts of chemistry such as the atomic mass unit, Avogadro's number, and the mole. The origin of these problems is found in the concept definitions. If these definitions are adjusted for teaching purposes, understanding could be improved. In the present…
Descriptors: Chemistry, Definitions, Science Instruction, College Science
Zhilin, Denis M. – Journal of Chemical Education, 2012
A simple, effective demonstration of the concept of limiting and excess reagent is presented. Mixtures of either air/methane (from a gas line) or air/butane (from a disposable cigarette lighter) contained in a plastic 2 L soda bottles are ignited. The mixtures combust readily when air/fuel ratios are stoichiometric, but not at a 2-fold excess of…
Descriptors: Stoichiometry, Science Instruction, College Science, Undergraduate Study
Sostarecz, Michael C.; Sostarecz, Audra Goach – Journal of Chemical Education, 2012
A solid foundation of chemistry principles is only gained through a true comprehension of the material as opposed to pure memorization. One of the most fundamental concepts in chemistry is that of determining the amount of product formed in a chemical reaction when one of the reactants is limiting. To increase students' comprehension of this…
Descriptors: Chemistry, Fundamental Concepts, Science Instruction, College Science
Nieves, Edgardo L. Ortiz; Barreto, Reizelie; Medina, Zuleika – Journal of Chemical Education, 2012
This activity introduces students to the concept of reduction-oxidation (redox) reactions. To help students obtain a thorough understanding of redox reactions, the concept is explored at three levels: macroscopic, submicroscopic, and symbolic. In this activity, students perform hands-on investigations of the three levels as they work at different…
Descriptors: Chemistry, Science Instruction, Secondary School Science, High Schools
Yu, Anne – Journal of Chemical Education, 2010
The gasometric analysis of nitrogen produced in a reaction between sodium nitrite, NaNO[superscript 2], and sulfamic acid, H(NH[superscript 2])SO[superscript 3], provides an alternative to more common general chemistry experiments used to study the ideal gas law, such as the experiment in which magnesium is reacted with hydrochloric acid. This…
Descriptors: Chemistry, Stoichiometry, Laboratory Experiments, Science Experiments
Molnar, Jozsef; Molnar-Hamvas, Livia – Online Submission, 2011
The presented strategy of chemistry calculation is based on mole-concept, but it uses only one fundamental relationship of the amounts of substance as a basic panel. The name of LEGO-method comes from the famous toy of LEGO[R] because solving equations by grouping formulas is similar to that. The relations of mole and the molar amounts, as small…
Descriptors: Chemistry, Computation, Science Instruction, Teaching Methods
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
Gulacar, Ozcan; Bowman, Charles R.; Feakes, Debra A. – Science Education International, 2013
The problem-solving strategies of students enrolled in general chemistry courses have been the subject of numerous research investigations. In most cases, the investigators were interested in the specific areas or concepts that posed the greatest difficulty to a student's success in achieving the correct answer. However, the investigation reported…
Descriptors: Problem Solving, College Students, Chemistry, Science Instruction