大学化学 >> 2022, Vol. 37 >> Issue (8): 2112075.doi: 10.3866/PKU.DXHX202112075

所属专题: “新农科”背景下化学类专业与课程建设

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农科普通化学稀溶液依数性的情景教学实践与教学难点思考

张三兵1, 张莉1,*(), 李作鹏2   

  1. 1 中国农业大学理学院化学系, 北京 100193
    2 山西大同大学应用化学研究所, 山西 大同 037009
  • 收稿日期:2021-12-27 录用日期:2022-03-03 发布日期:2022-03-22
  • 通讯作者: 张莉 E-mail:zhlily@cau.edu.cn
  • 作者简介:张莉, Email: zhlily@cau.edu.cn
  • 基金资助:
    中国农业大学教改项目(BH2020072);中国农业大学教改项目(BH2021108)

Situational Teaching Practice and Thinking about Teaching Difficulties of Colligative Properties of Dilute Solutions in Agricultural General Chemistry

Sanbing Zhang1, Li Zhang1,*(), Zuopeng Li2   

  1. 1 Department of Chemistry, College of Science, China Agricultural University, Beijing 100193, China
    2 Institute of Applied Chemistry, Shanxi Datong University, Datong 037009, Shanxi Province, China
  • Received:2021-12-27 Accepted:2022-03-03 Published:2022-03-22
  • Contact: Li Zhang E-mail:zhlily@cau.edu.cn

摘要:

探讨在农科普通化学稀溶液依数性教学中结合学生专业运用情景教学法的实践,有利于提高学生学习兴趣,也有利于提高学生学习效果。针对国内普通化学教材中关于稀溶液依数性中蒸气压下降公式中k表达式的不同表示形式,从蒸气压下降公式的推导入手,提出了两者表示形式不同的原因是物理量量纲问题引起的。该方法减少学生相关计算的出错概率,并有助于强化学生对蒸气压下降及稀溶液其他依数性的理解。

关键词: 情景教学, 稀溶液, 依数性, 蒸气压下降, 蒸气压下降系数

Abstract:

Combined with the students' majors, the practice of applying the situational teaching method in the colligative properties of dilute solutions in agricultural general chemistry was discussed. This teaching practice is beneficial for students to improve their interest in learning and the learning effect. There is no unified expression for vapor pressure lowering constant k of the colligative properties of dilute solutions in domestic general chemistry courses. This work made theoretic analysis of the expression of k based on the equation derivation of vapor pressure lowering. The results show that the different expression forms of vapor pressure lowering constant k are due to the unit of the physical quantity. We believe this work can reduce the probability of making mistakes. It also helps students understand and master vapor pressure lowering and other colligative properties of dilute solutions.

Key words: Situational teaching, Dilute solution, Colligative property, Vapor pressure lowering, Vapor pressure lowering constant

MSC2000: 

  • G64