8 Result(s) for 'school experiments'
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Catalysis Revisited An Overview of Classical school experiments and New Approaches for a Better Conceptual Understanding
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Marco Reinmold, Julian Grob, Bastian Hohm, Arnim Lühken
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World Journal of Chemical Education. 2023 11 (3). doi: 10.12691/wjce-11-3-14
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Keywords: Catalysis, kinetics, reaction order, homogeneous, heterogeneous, enzyme catalysis, photometry, BYOD, content knowledge, conceptual understanding, classical school experiments , new approaches, hands-on experiments, easy to perform
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Context: ...t contexts of green and sustainable chemistry. To promote such an adequate conceptual understanding, this article presents five school experiments . The experiments allow high school students to acquire the concepts of kinetics and catalysis in a technically correct mann...
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Context: Hydrogen is becoming increasingly important as a versatile energy source in society and industry across various sectors. It is obtained through the electrolysis of water, in which water is split electrolytically into oxygen and hydrogen. The production of hydrogen through electrolysis is an excellent way to teach students key aspects of modern energy storage and the energy transition in a clear and concise manner. However, simple, safe, and inexpensive experiments are particularly important in school lessons. The model experiment presented here shows how the electrolysis of water can be carried out successfully and safely using readily available everyday materials. Both technical fundamentals and safety-related aspects are taken into account.
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Context: ...ion and, in its first part, presents new experiments on additive colour mixing with fluorescent solutions. In addition, further school experiments with impressive fluorescence effects are described....
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school experiments on Different Lithium Batteries
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Dominique Rosenberg
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World Journal of Chemical Education. 2023 11 (3). doi: 10.12691/wjce-11-3-16
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Keywords: lithium batteries, lithium-manganese dioxide-batteries, lithium-pyrite-batteries, lithium-iodine-batteries
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Context: Lithium-ion based batteries are the most commonly used energy storage systems for electronic systems like tablets, smartphones, etc. in present times. Moreover, lithium ion-batteries are “the beacon of hope” for the automotive industry for the use in electric and hybrid cars and for the energy revolution to be applied as a short-time energy storage. However, other lithium-metal-based batteries are used in everyday life, such as lithium-manganese dioxide battery or lithium-iodine-battery. These types of batteries are much less known, but are used very frequently in everyday life. In this article simple experiments with lithium-batteries are presented.
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Context: Within this article we present the synthesis of coin metal nanoparticles and nanoporous surfaces by cathodic corrosion as school experiments . We further present two experiments utilizing the obtained materials as catalysts; the catalytic decomposition of hydrogen ...
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Energy Supply with Biogas – An Example of Curricula Innovation Research in the Field of Renewable Energy
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Isabel Rubner, Linda Baur, Bettina Grau, Jörg Steinbrenner, Benedikt Hülsemann
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World Journal of Chemical Education. 2023 11 (3). doi: 10.12691/wjce-11-3-4
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Keywords: Hohenheim Biogas Yield Test, Anaerobic Digestion, Methane, Biogas, School, Education, Curricular Innovation Research
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Context: ... than 9000 biogas plants are currently in operation in Germany. The principle of biogas production has long been implemented in school experiments . However, it was recognized that the methods used in school experiments usually do not produce methane. Therefore, a new ex...
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Can You See the Heat? – Using a Thermal Imaging Camera in the Chemistry Classroom
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Claudia Bohrmann-Linde, Simon Kleefeld
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World Journal of Chemical Education. 2019 7 (2). doi: 10.12691/wjce-7-2-18
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Keywords: thermal imaging camera, thermal energy, IR radiation, energy turnover, chemical reactions, sensor, hands-on experiments, e-book, digital media, chemistry classroom
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Context: ...g chemical experiments. They enable the observation of phenomena which are not visible to the human eye. In this paper a set of school experiments is described in which the use of a thermal imaging camera gives additional information on ongoing processes. Additionally a...
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Context: Diffusion is a transport process frequently shown experimentally in beginning science classes. However, quite a few standard school “diffusion experiments” such as letting food colorant drip into water and spraying perfume (or similar) into a classroom provide a false picture of diffusion by demonstrating convection, transport by flow, instead. The article explains why these two standard experiments clearly show convection and should therefore be banned from school lessons as "diffusion experiments": Diffusion is explained to be an entropy-driven process and, based on this, the so-called Einstein-Smoluchowski equation is derived with the help of simple probability calculations. Using the Einstein-Smoluchowski equation, it is then shown how transport phenomena can be clearly recognized as diffusion or be unmasked as convection experiments. The reader is provided with alternative genuine diffusion experiments for beginning classes that verifiably demonstrate diffusion, namely the spread of ammonia and hydrogen chloride in a sealed glass tube and the spread of methylene blue in water-based gels. Additionally, it is shown how these experiments can be used to quantify diffusion constants with the aid of the Einstein-Smoluchowski equation.
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