大学化学 >> 2022, Vol. 37 >> Issue (1): 2104004.doi: 10.3866/PKU.DXHX202104004

化学实验 上一篇    下一篇

“元素化学实验”中的热致变色现象(一)——部分Co(Ⅱ)化合物的热致变色现象及其变色机理探讨

阮婵姿, 潘蕊, 许振玲, 翁玉华, 张春艳, 吕银云, 董志强, 任艳平()   

  • 收稿日期:2021-04-06 录用日期:2021-04-28 发布日期:2021-05-10
  • 通讯作者: 任艳平 E-mail:ypren@xmu.du.cn
  • 作者简介:任艳平, Email: ypren@xmu.du.cn
  • 基金资助:
    2021年度教育部“基础学科拔尖学生培养计划2.0”研究课题(20212058);教育部2020年产学合作协同育人项目(202002060029);首批国家级线下一流课程建设项目

Thermochromic Phenomena in "Elemental Chemistry Experiment" (Ⅰ): Thermochromic Phenomenon and Discussion on Thermochromic Mechanism of Some Co(Ⅱ) Compounds

Chanzi Ruan, Rui Pan, Zhenling Xu, Yuhua Weng, Chunyan Zhang, Yinyun Lü, Zhiqiang Dong, Yanping Ren()   

  • Received:2021-04-06 Accepted:2021-04-28 Published:2021-05-10
  • Contact: Yanping Ren E-mail:ypren@xmu.du.cn

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摘要：

以探讨Co2+鉴定实验过程中意外发现在适量CoCl2溶液中加入适量NH4SCN溶液的体系具有可逆热致变色现象为切入点，在分析和探讨其热致变色机理的基础上，顺势通过“先做后教、以做定教”实验教学的“翻转课堂”模式，即学生完成元素化学实验，具有亲身经历和切身体会后，以“问题”为导向，以生动直观的演示实验现象为基础，引导学生直观认识一些Co（Ⅱ）化合物的热致变色现象及其影响因素，启发学生应用化学原理与化学知识解释和探讨热致变色现象产生的本质，以加深学生对配合物的结构、性质以及分裂能概念的理解，培养学生的观察、分析、判断、归纳、推理、总结和探索规律的能力以及“批判性”思维能力。

关键词: Co(Ⅱ)化合物, 热致变色, 影响因素, 机理探讨

Abstract:

In the Co2+ identification experiment, it was accidentally found that with an appropriate amount of SCN- added into CoCl2 solution, the solution presented reversible thermochromic phenomenon. Inspired by this phenomenon, the "flipped classroom" mode of experimental teaching of "doing first, teaching later, teaching determined by doing" was adopted accordingly based on the analysis and discussion of its thermochromic mechanism. Specifically, students do the experiment first and have questions during the experimental process, then the teacher demonstrates with students based on their questions, leading students to intuitive understanding of the thermochromic phenomenon and its influencing factors of some Co(Ⅱ) compounds or complexes. This article inspires students to use chemical principles and knowledge to explain and discuss the nature of thermochromic phenomenon, so as to deepen students' understanding of the structure, properties and concept of splitting energy of complexes. It also cultivates the students' ability of observation, analysis, judgment, induction, reasoning, summary, conclusion regular and "critical" thinking.

Key words: Co(Ⅱ) compounds, Thermochromism, Influencing factors, Discussion on thermochromic mechanism