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相关概念视频

Energetics of Solution Formation02:35

Energetics of Solution Formation

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The formation of a solution is an example of a spontaneous process, which is a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Formation of the solution requires the solute–solute and solvent–solvent...
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Intermolecular Forces in Solutions02:28

Intermolecular Forces in Solutions

32.7K
The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...
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Chemical and Solubility Equilibria02:21

Chemical and Solubility Equilibria

4.0K
The free energy change associated with dissolving a solute in a liter of solvent is called the free energy of a solution, ΔGsolution. The overall ΔGsolution is expressed as the balance of ΔGinteraction against the always-favorable free-energy of mixing, ΔGmixing. Solution formation is favorable if  ΔGsolution is less than zero, whereas it is unfavorable if ΔGsolution is greater than zero. In short, for a solution to form and complete dissolution to take place,...
4.0K
Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

14.2K
Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
14.2K
Solvating Effects02:12

Solvating Effects

7.2K
An understanding of the solvating effect helps rationalize the relation between solvation and acidity of the compound. In addition, this also explains the relative stability of conjugate bases for compounds with different pKa values. This lesson details, in-depth, the principle of solvating effects. The strength of an acid and the stability of its corresponding conjugate base are determined using pKa values. This observed relationship is a consequence of solvation, which is the interaction...
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Intermolecular Forces03:13

Intermolecular Forces

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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Updated: May 15, 2025

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来自原子表面交互点的溶解能量.

Emily Gross1, Mark D Driver2, Areesha Saif2

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概括

液体平衡的表面位相互作用模型 (SSIMPLE) 现在可以计算流体相热力学性质的温度变化. 这种增强的模型准确地预测了各种化合物的液体密度和蒸汽-液体平衡.

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科学领域:

  • 物理化学 物理化学
  • 计算化学计算化学

背景情况:

  • 流体的热力学特性对于化学工程过程至关重要.
  • 现有的模型往往难以准确地捕捉温度依赖的行为.
  • 非共价相互作用在流体相内的分子相互作用中起着重要作用.

研究的目的:

  • 为了将平衡液体的表面位相互作用模型 (SSIMPLE) 推广为温度依赖的计算.
  • 开发一种基于分子间相互作用的流体相密度模型.
  • 评估SSIMPLE在不同温度下预测关联常数和蒸汽-液体平衡的能力.

主要方法:

  • 将SSIMPLE模型概括为包括温度依赖的极性相互作用.
  • 开发了一个扩张能量概念,该概念基于分子间表面交互点 (SSIP) 的互动.
  • 在171种化合物中使用了SSIP的原子相互作用点 (AIP) 版本.
  • 对二元混合物的关联常数和蒸汽液体平衡 (VLE) 的实验数据进行验证.

主要成果:

  • 在SSIMPLE中,非极性相互作用项是温度独立的,而极性项是温度依赖的.
  • 一般化的SSIMPLE模型准确地预测了H键复合体的关联常数的温度依赖性.
  • 使用AIP-SSIP描述计算的室温液体密度与实验数据有很好的一致性.
  • 对于196种二元混合物,SSIMPLE成功地复制了实验性蒸汽液体平衡.

结论:

  • 一般化的SSIMPLE模型为计算流体的取决于温度的热力学性质提供了一个强大的框架.
  • SSIMPLE精确地模拟了液相特性 (密度,关联常数) 和蒸汽-液平衡.
  • 该模型处理非共价相互作用的能力使其适用于各种流体系统.