An Experiment to Demonstrate How a Catalyst Affects the Rate of a Reaction

Autor:	Edward Koubek, Christine L. Copper
Rok vydání:	1999
Předmět:	Reaction rate Science instruction Chemistry education Thermodynamics Nanotechnology General Chemistry Activation energy Iodine clock reaction Chemical reaction Education Catalysis
Zdroj:	Journal of Chemical Education. 76:1714
ISSN:	1938-1328 0021-9584
DOI:	10.1021/ed076p1714
Popis:	By performing this experiment, students in general and introductory physical chemistry can learn more about the effect of a catalyst on a chemical reaction. This experiment, which is a modified version of the traditional iodine clock reaction, allows students to calculate rates of reaction, orders of reactants, and activation energies. It also lets students discover that to increase a reaction's rate, a catalyst need only provide any additional pathway for the reaction, not necessarily a pathway having a lower activation energy. This experiment is designed so that students will notice that the amount of catalyst used is important. Furthermore, the slight amount (~10-5 M MoO42-) of catalyst needed to increase the overall reaction rate and the abrupt color change that occurs seem to pique the interest of our students.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::9fbef21d5231a578c303a5e9f04f4db3 https://doi.org/10.1021/ed076p1714 Zobrazit plný text záznamu