关于化学反应G-ξ曲线的教学探讨  

A Discussion on the Teaching of G-ξ Curve in Physical Chemistry

作　　者：王新平[1] 靳长德[1] 王斌[1] 袁守志[1] 

机构地区：[1]大连理工大学化工学院化学系,辽宁大连116024

出　　处：《化工高等教育》2007年第6期35-37,58,共4页Higher Education in Chemical Engineering

基　　金：大连理工大学教学研究面上基金“在物理化学教学中为创新潜力优势学生开辟‘绿色培养通道’”课题的支持.

摘　　要：本文分析了学生难以理解△rGm随化学反应进度孚改变的原因，认为在物理化学教学中，应选用在反应进度ξ=0～1mol区间内均为上凹形G～ξ曲线。原因是一个常规反应体系随着反应进度的增加，其G～ξ曲线普遍为该形状。对于△rGm不随反应进度ξ而改变的反应，我们认为反应产物间的同相混合吉布斯函数变应列入△rGm判断反应的自发方向。In this paper, the variation of ΔrGm with the reaction extent （ξ） for reactions conducted in the system with a general scale was discussed, which was widely accepted to be difficult for the students to be understand. It was proposed that the G-ξ curve showing in the Physical Chemistry for the students＇ study should be the general ones describing the variation of Gibbs function of the system vs. the extent of reaction, which is deflexibility in shape in the total region of ξ=0-1 mol. In addition, it was proposed that ΔG arising from the mixing between the products in the same phase should be accounted in the calculation of the ΔrGm for the reactions without the mixing between the reactants and products, although the ΔrGm of the reaction is not dependent on the reaction extent, for this type of reaction.

关 键 词：G~ξ曲线 曲线形状 (δG/δξ)T p 反应限度 反应进度 

分 类 号：O643.1[理学—物理化学]