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首页> 外文期刊>Journal of Chemical Education >Stepwise Approach to Hess's Law Using Household Desiccants: A Laboratory Learning Program for High School Chemistry Courses
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Stepwise Approach to Hess's Law Using Household Desiccants: A Laboratory Learning Program for High School Chemistry Courses

机译：使用家庭干撕衣逐步前往Hess的法律：高中化学课程的实验室学习计划

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摘要

This study focuses on designing a laboratory learning program for a high school chemistry course in which students could discover the fundamental principles of Hess's law via stepwise inquiry. By exploring the chemical properties of common desiccants, mainly those that were reactive in water, students were introduced to the exothermic reaction of CaO(s) with H_2O(l) as a heating agent. Due to the difficulties associated with directly measuring the heat of reaction for CaO(s) with H_2O(l), the heats of reaction for CaO(s) with HCl(aq) and Ca(OH)_2(s) with HCl(aq) were measured. Students could find the most appropriate experimental procedures through discussion in each group and subsequently establish a protocol in the class. The heats of reaction determined by students' experiments closely corresponded to those calculated using the thermodynamic database. Using the experimental values obtained for the reactions of CaO(s) with HCl(aq) and Ca(OH)_2(s) with HCl(aq), students could discover the relationship that existed among the heats of reaction for CaO(s) with H_2O(l), CaO(s) with HCl(aq), and Ca(OH)_2(s) with HCl(aq) by drawing an energy diagram and making the relevant thermochemical calculations.
机译：本研究侧重于设计高中化学课程的实验室学习计划，其中学生可以通过逐步查询发现Hess律法的基本原则。通过探索常见干燥剂的化学性质，主要是在水中反应的化学性质，学生被引入CaO（S）与H_2O（L）作为加热剂的放热反应。由于与H_2O（L）直接测量CaO（S）的反应热，CaO（水溶液）和Ca（OH）_2（S）与HCl（aq（aq）（aq）的反应热（aq ）被测量。学生可以通过每组讨论找到最合适的实验程序，并随后在课堂上建立一个协议。学生实验确定的反应热度与使用热力学数据库计算的那些相对应。使用用HCl（AQ）和Ca（OH）和Ca（OH）_2（S）与HCl（aq）反应获得的实验值，学生可以发现Cao（s）反应热量中存在的关系用HCl（AQ），CaO（S），CaO（S），通过绘制能量图并制备相关的热化学计算，具有HCl（AQ）的Ca（OH）_2（S）。

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