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Kingir, Sevgi; Geban, Omer – Hacettepe University Journal of Education, 2012
The purpose of the present study was to investigate the effect of conceptual change text oriented instruction compared to traditional instruction on 10th grade students' understanding of reaction rate concepts. 45 students from two classes of the same teacher in a public high school participated in this study. Students in the experimental group…
Descriptors: Chemistry, Secondary School Science, Science Instruction, Scientific Concepts
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Akin, Fatma Nur; Uzuntiryaki-Kondakci, Esen – Chemistry Education Research and Practice, 2018
We examined the interactions among pedagogical content knowledge (PCK) components of novice and experienced chemistry teachers in teaching reaction rate and chemical equilibrium topics in this qualitative multiple-case design study. For this aim, three chemistry teachers who had different levels of teaching experience in chemistry teaching were…
Descriptors: Pedagogical Content Knowledge, Chemistry, Science Instruction, Science Teachers
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Landstrom, Evan B.; Nichol, Meghan; Lipshutz, Bruce H.; Gainer, Morgan J. – Journal of Chemical Education, 2019
Micellar catalysis has become an important aspect of the chemical industry's effort to "go green". However, this chemistry has yet to be fully explored in educational settings such as second-year organic chemistry laboratories. Reported herein is a discovery-based nucleophilic aromatic substitution experiment that introduces chemistry…
Descriptors: Discovery Learning, Science Experiments, Water, Organic Chemistry
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Calik, Muammer; Kolomuc, Ali; Karagolge, Zafer – Journal of Science Education and Technology, 2010
This paper reports on an investigation of the effect of conceptual change pedagogy on students' conceptions of "rate of reaction" concepts. The study used a pre-test/post-test non-equivalent comparison group design approach and the sample consisted of 72 Turkish grade-11 students (aged 16-18 years) selected from two intact classrooms.…
Descriptors: Foreign Countries, Intervention, Concept Formation, Teaching Methods
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Barrera, Luis A.; Alma C. Escobosa; Alsaihati, Laila S.; Noveron, Juan C. – Journal of Chemical Education, 2019
Herein we present a modified iodine clock experiment which replaces starch with cellulose paper. This provides the reaction with a white solid surface in which color change can be clearly observed and reduces reagent amounts required to 540 µL per group. After data acquisition, students are required to calculate reaction orders and the reaction…
Descriptors: Science Experiments, Chemistry, Kinetics, Science Laboratories
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Chan, Kennedy Kam Ho; West-Pratt, Jordan; Ng, Richard Chi Keung – American Biology Teacher, 2021
Students need procedural understanding--that is, knowledge of the procedures that scientists use to establish scientific evidence (also known as "concepts of evidence"), to successfully perform scientific investigations, and to evaluate public and scientific claims. However, concepts of evidence are seldom explicitly targeted in routine…
Descriptors: Science Instruction, Biology, Science Process Skills, Scientific Concepts
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Iribe, Jessica; Hamada, Terianne; Kim, Hyesoo; Voegtle, Matt; Bauer, Christina A. – Journal of Chemical Education, 2020
The principles of chemical kinetics comprise one of the core topics that appear throughout chemistry. Standard kinetics lessons typically cover reaction rates and relative rates, rate laws, integrated rate laws, half-lives, collision theory, and the Arrhenius equation. They can also introduce a discussion of mechanisms as well, which may be the…
Descriptors: Science Instruction, College Science, Undergraduate Study, Science Laboratories
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Leonello, Rocco; Savio, Matteo; Toaldo, Paola Baron; Bonomi, Renato – Journal of Chemical Education, 2018
Determination of enzymatic activity is a relevant experiment in teaching chemistry and biochemistry to high school and college students. A method for measuring the kinetic parameters of lactose cleavage by the enzyme lactase is described. This enzyme catalyzes the hydrolysis of lactose to galactose and glucose. The kinetic parameters can be…
Descriptors: Science Instruction, College Science, Undergraduate Study, Chemistry
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Ng, Enoch Ming Wei; Song, Zhixiong; Yau, Chin Doong; Liew, Oi Wah; Ng, Tuck Wah – Journal of Chemical Education, 2021
The reaction between hydrochloric acid and calcium carbonate to produce carbon dioxide gas is a popular and engaging experiment to illustrate chemical reactions that result in the production of gases. It also provides a useful model for teaching concepts related to the effects of concentration on reaction rates. Although a prepared hydrochloric…
Descriptors: Science Experiments, Laboratory Experiments, Laboratory Safety, Chemistry
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Leong, Jhaque; Ackroyd, Nathan C.; Ho, Karen – Journal of Chemical Education, 2014
The synthesis of N-methoxycarbonyl-2-imidazolidone, an analogue of biotin, was conducted by organic chemistry students and confirmed using FT-IR and H NMR. Spectroscopy students used FT-IR to measure the rate of hydrolysis of the product and determined the rate constant for the reaction using the integrated rate law. From the magnitude of the rate…
Descriptors: Science Instruction, Science Laboratories, Spectroscopy, Kinetics
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Tran, Kiet; Beshir, Anwar; Vaze, Abhay – Journal of Chemical Education, 2020
A comparison of the experiences of both organic and analytical lab faculty during the COVID-19 pandemic distance learning initiative is described here. Faculty of both lab courses experienced four shared challenges in the transition to the online format: (1) experimental implementation; (2) assessments and postlab activities; (3) technological…
Descriptors: Science Instruction, Science Laboratories, COVID-19, Pandemics
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Elen, Ken; Hardy, An; Van Bael, Marlies K. – Journal of Chemical Education, 2020
The redox reaction between dioxovanadium(V) and oxalate is proposed as a suitable system to analyze the kinetics of a twostep reaction mechanism using UV-vis spectroscopy. First, the spectra of dioxovanadium(V) and its reduced counterpart oxovanadium(IV) are compared and explained using the crystal field theory. The change in absorbance can be…
Descriptors: College Science, Chemistry, Undergraduate Students, Laboratory Experiments
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Rushton, Gregory T.; Criswell, Brett A.; McAllister, Nicole D.; Polizzi, Samuel J.; Moore, Lamesha A.; Pierre, Michelle S. – Journal of Chemical Education, 2014
Reaction kinetics is an axiomatic topic in chemistry that is often addressed as early as the high school course and serves as the foundation for more sophisticated conversations in college-level organic, physical, and biological chemistry courses. Despite the fundamental nature of reaction kinetics, students can struggle with transforming their…
Descriptors: Science Instruction, Chemistry, College Science, Kinetics
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Ault, Addison – Journal of Chemical Education, 2011
Rate equations for enzyme-catalyzed reactions are derived and presented in a way that makes it easier for the nonspecialist to see how the rate of an enzyme-catalyzed reaction depends upon kinetic constants and concentrations. This is done with distribution equations that show how the rate of the reaction depends upon the relative quantities of…
Descriptors: Equations (Mathematics), Biochemistry, Chemistry, Kinetics
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Schmitz, Guy – Journal of Chemical Education, 2005
The definition of reaction rate is derived and demonstrations are made for the care to be taken while using the term. Reaction rate can be in terms of a reaction property, the extent of reaction and thus it is possible to give a definition applicable in open and closed systems.
Descriptors: Chemistry, Science Education, Science Experiments, Stoichiometry
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