摘要
在热力学以至整个物理学中,嫡是一个很重要的物理概念。它对于透彻理解和深入掌握热力学第二定律,以及了解物质世界演化过程都非常重要。将稀溶液的依数性问题与熵变关联,通过整理和变换凝固点降低常数(k_f)和沸点升高常数(k_b)的数学表达式,获得了二者与摩尔熔化熵和摩尔蒸发熵的关系式,通过比较汽化过程和熔化过程的熵变大小理解同一稀溶液中凝固点降低值(ΔT_f)大于沸点升高值(ΔT_b)的结论。
Entropy is considered as a considerable physical conception in thermodynamics and even physics,which is crucial for comprehending and mastering second law of thermodynamics,as well as realizing the evolutionary process of natural world. The colligative properties of dilute solutions were associated with the entropy change. Through setting and transforming the mathematical expressions of freezing constant（kf） and boiling constant（kb）,the relational expression between freezing constant and molar entropy of fusion and the relational expression between boiling constant and molar entropy of evaporation were obtained,respectively. The conclusion of freezing point depression more than the boiling point elevation in the same dilute solution was deeply comprehended by comparing the magnitude between gasification process and melting process.
作者
刘翔宇
梁斌
杨锐
倪刚
宋伟明
LIU Xiang-yu;LIANG Bin;YANG Rui;NI Gang;SONG Wei-ming(School of Chemistry and Chemical Engineering,National Demonstration Center for ExperimentalChemistry Education,Ningxia University,Ningxia Yinchuan 750021,China)
出处
《广州化工》
CAS
2018年第11期98-100,共3页
GuangZhou Chemical Industry
基金
2017年自治区高等学校本科教学质量与教学改革工程项目(NXJG2017011)
宁夏回族自治区"化学工程与技术"国内一流学科建设项目(NXYLXK2017A04)
宁夏大学"西部一流专业(化学)"建设项目
关键词
熵
依数性
凝固点降低
沸点升高
entropy
colligative property
freezing point depression
boiling point elevation
