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相关概念视频

Enthalpy of Solution02:39

Enthalpy of Solution

25.3K
There are two criteria that favor, but do not guarantee, the spontaneous formation of a solution:
25.3K
Entropy and Solvation02:05

Entropy and Solvation

7.2K
The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
7.2K
Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

15.0K
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...
15.0K
Hess's Law03:40

Hess's Law

46.2K
There are two ways to determine the amount of heat involved in a chemical change: measure it experimentally, or calculate it from other experimentally determined enthalpy changes. Some reactions are difficult, if not impossible, to investigate and make accurate measurements for experimentally. And even when a reaction is not hard to perform or measure, it is convenient to be able to determine the heat involved in a reaction without having to perform an experiment.
46.2K
Enthalpy02:59

Enthalpy

36.7K
Chemists ordinarily use a property known as enthalpy (H) to describe the thermodynamics of chemical and physical processes. Enthalpy is defined as the sum of a system’s internal energy (E) and the mathematical product of its pressure (P) and volume (V):
36.7K
Entropy01:18

Entropy

2.8K
The first law of thermodynamics is quantitatively formulated via an equation relating the internal energy of a system, the heat exchanged by it, and the work done on it. A quantitative formulation of the second law of thermodynamics leads to defining a state function, the entropy.
When an ideal gas expands isothermally, the disorder in the gas increases. From the molecular perspective, the gas molecules have more volume to move around in.
Consider an infinitesimal step in the expansion, which...
2.8K

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相关实验视频

Updated: Sep 13, 2025

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
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Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes

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关于在水溶液中对过程进行特征化的度-度补偿.

Fiorella Mancini1, Giuseppe Graziano1

  • 1Dipartimento di Scienze e Tecnologie, Università del Sannio, Via Francesco de Sanctis snc, 82100 Benevento, Italy.

Entropy (Basel, Switzerland)
|July 29, 2025
PubMed
概括
此摘要是机器生成的。

和的补偿在水中很常见,尤其是生物分子. 一个一般的水合理论解释说,当溶解物-水的吸引力比水-水的键弱时,这种情况会发生.

关键词:
吉布斯的自由能量是自由的.创建空洞的创建.蛋白质的形状稳定性 蛋白质的形状稳定性enthalpy Entropy 的补偿补充水分 补充水分 补充水分溶液与水之间的相互作用.水水的 H 键.

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科学领域:

  • 物理化学 物理化学
  • 生物物理化学 生物物理化学
  • 热力学是一种热力学.

背景情况:

  • 度-度补偿是水溶液中普遍存在的现象.
  • 它在涉及生物巨分子的过程中尤其普遍.
  • 对这种补偿的现有解释是多种多样的.

研究的目的:

  • 介绍一个一般的水理论.
  • 专注于一种特定的物理条件来进行热-热补偿.
  • 将这个理论应用于了解水性过程.

主要方法:

  • 专注于水分的一般理论.
  • 分析溶解物-水和水-水相互作用.
  • 物理化学原理的应用.

主要成果:

  • 提出了一个对力-力补偿的物理条件:相对于水-水键,溶解物-水的吸引力相对较弱.
  • 由于其合作性H键网络,这种条件通常在水中得到满足.
  • 该理论为理解水化效应提供了一个统一的框架.

结论:

  • 拟议的水化理论提供了一个对力-力补偿的基本解释.
  • 水的键网络的合作性是这种现象的关键.
  • 这项工作促进了对水系分子相互作用的理解.