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相关概念视频

Effect of Temperature Change on Reaction Rate02:28

Effect of Temperature Change on Reaction Rate

4.2K
The Arrhenius equation,
4.2K
Temperature Dependence on Reaction Rate02:55

Temperature Dependence on Reaction Rate

82.1K
The Collision Theory
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
82.1K
Thermodynamics: Activity Coefficient01:24

Thermodynamics: Activity Coefficient

1.5K
Activity is the measure of the effective concentration of the species in solution. It can be expressed as the product of the molar concentration of the species and its activity coefficient. The activity coefficient is a dimensionless quantity and depends on the total ionic strength of the solution.
The activity coefficient is a measure of the deviation from ideal behavior. When the ionic strength of the solution is minimal, the activity coefficient of an ionic species is close to unity, making...
1.5K
Arrhenius Plots02:34

Arrhenius Plots

40.1K
The Arrhenius equation relates the activation energy and the rate constant, k, for chemical reactions. In the Arrhenius equation, k = Ae−Ea/RT, R is the ideal gas constant, which has a value of 8.314 J/mol·K, T is the temperature on the kelvin scale, Ea is the activation energy in J/mole, e is the constant 2.7183, and A is a constant called the frequency factor, which is related to the frequency of collisions and the orientation of the reacting molecules.
The Arrhenius equation can be used...
40.1K
Thermal Strain01:19

Thermal Strain

2.0K
Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
2.0K
Extraction: Partition and Distribution Coefficients01:14

Extraction: Partition and Distribution Coefficients

2.5K
The distribution law or Nernst's distribution law is the law that governs the distribution of a solute between two immiscible solvents. This law, also known as the partition law, states that if a solute is added to the mixture of two immiscible solvents at a constant temperature, the solute is distributed between the two solvents in such a way that the ratio of solute concentrations in the solvents remains constant at equilibrium.
For extracting a solute from an aqueous phase into an...
2.5K

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相关实验视频

Updated: Jul 23, 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

Published on: January 16, 2016

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多结构分区功能切断及其对热速常数的影响.

Joel Leitão Nascimento1, Maiara Oliveira Passos1, Tiago Vinicius Alves1

  • 1Departamento de Físico-Química, Instituto de Química-Universidade Federal da Bahia. Rua Barão de Jeremoabo, 147, Salvador, Bahia, 40170-115, Brazil. tiagova@ufba.br.

Physical chemistry chemical physics : PCCP
|July 17, 2023
PubMed
概括

本研究使用先进的计算方法计算甲基酸反应的热速常数. 裁断构造数据显著影响准确性,导致潜在错误高达75%.

科学领域:

  • 化学动力学 化学动力学
  • 计算化学的计算化学

背景情况:

  • 抽取的反应在化学过程中至关重要.
  • 准确计算热速常数对于理解反应动态至关重要.

研究的目的:

  • 为了计算甲基酸的抽象反应的热速常数.
  • 调查构造分析对理论速率常数计算的影响.

主要方法:

  • 使用了多结构规范变量理论与小曲率道 (MS-CVT/SCT).
  • 采用一个结合系统和随机搜索算法进行结构分析.
  • 执行了高级电子结构计算 (MPWB1K/6-31+G(d,p)).

主要成果:

  • 鉴定了244种甲基酸和相关过渡状态的独特几何形状.
  • 证明在的-OCH3组周围的旋转产生不稳定的结构,对分区功能的贡献最小.
  • 量化证明,切断多结构性反振动分区函数可以引入高达75%的错误.

结论:

  • 合规灵活性显著影响理论速率常数的准确性.
  • 仔细考虑所有相关的形状是必要的可靠的计算预测.

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  • 该MS-CVT/SCT方法为研究复杂反应系统提供了一个强大的框架.