大学化学 >> 2020, Vol. 35 >> Issue (9): 205-208.doi: 10.3866/PKU.DXHX201910055

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二级反应速率常数与活化能计算问题的讨论

李奇飚, 郝雅娟()   

  • 收稿日期:2019-10-28 录用日期:2019-12-03 发布日期:2019-12-09
  • 通讯作者: 郝雅娟 E-mail:yjhao@sxu.edu.cn

Discussion on the Calculation of Rate Constant and Activation Energy of Second-Order Reaction

Qibiao Li, Yajuan Hao()   

  • Received:2019-10-28 Accepted:2019-12-03 Published:2019-12-09
  • Contact: Yajuan Hao E-mail:yjhao@sxu.edu.cn

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摘要：

针对物理化学参考书中个别有关化学反应速率常数的计算问题进行讨论。计算二级反应的速率常数k时，套用半衰期公式要注意与反应计量方程式的表达形式相对应；对于理想气体反应使用Arrhenius公式计算活化能时，要注意反应速率常数kc和kp以及相应活化能Eac和Eap的区别。以帮助学生在计算过程中有正确的理解和认识。

关键词: 反应速率常数, 半衰期, 气相反应, 活化能

Abstract:

In this paper, we discussed several problems on calculation of reaction rate constant in physical chemistry reference books. When calculating the rate constant k of the second-order reaction, we should make the half-life formula consistent with the reaction stoichiometric equation. And when calculating the activation energy with Arrhenius formula for ideal gas-phase reaction, attention should be paid to identifying the difference between the reaction rate constant kc and kp, as well as the difference between corresponding activation energy Eac and Eap. It is beneficial for students to have a correct understanding in calculation.

Key words: Reaction rate constant, Half-life, Gas-phase reaction, Activation energy