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相关概念视频

Strong Acid and Base Solutions03:22

Strong Acid and Base Solutions

32.3K
A strong acid is a compound that dissociates completely in an aqueous solution and produces a concentration of hydronium ions equal to the initial concentration of acid. For example, 0.20 M hydrobromic acid will dissociate completely in water and produces 0.20 M of hydronium ions and 0.20 M of bromide ions.
32.3K
Titration Calculations: Weak Acid - Strong Base03:55

Titration Calculations: Weak Acid - Strong Base

45.1K
Calculating pH for Titration Solutions: Weak Acid/Strong Base
For the titration of 25.00 mL of 0.100 M CH3CO2H with 0.100 M NaOH, the reaction can be represented as:
45.1K
Polyprotic Acids03:38

Polyprotic Acids

29.5K
Acids are classified by the number of protons per molecule that they can give up in a reaction. Acids such as HCl, HNO3, and HCN that contain one ionizable hydrogen atom in each molecule are called monoprotic acids. Their reactions with water are:
29.5K
Intermolecular Forces03:13

Intermolecular Forces

61.0K
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...
61.0K
Chemical Equilibria: Systematic Approach to Equilibrium Calculations01:21

Chemical Equilibria: Systematic Approach to Equilibrium Calculations

822
Equilibrium calculations for systems involving multiple equilibria are often complex. For example, to calculate the solubility of a sparingly soluble salt in an aqueous solution in the presence of a common ion, one must consider all the equilibria in this solution. Calculations for these systems can be complicated and tedious, so a systematic approach with a series of steps is often helpful. The process is detailed below.
The first step is to identify all the chemical reactions involved, The...
822
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

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相关实验视频

Updated: Sep 9, 2025

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

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机器学习优化氧化物传输的原子间潜力:单度训练的惊人效率

Jonas Hänseroth1, Christian Dreßler1

  • 1Theoretical Solid State Physics, Institute of Physics, Technische Universität Ilmenau, 98693 Ilmenau, Germany.

The Journal of chemical physics
|August 28, 2025
PubMed
概括

氧化溶液的机器学习潜力显示出不同度的可转移性较差. 在中间度上进行微调可以提高准确度,并捕捉高度现象,如结合.

科学领域:

  • 计算化学
  • 材料科学
  • 机器学习

背景情况:

  • 机器学习的原子间潜力 (MLIP) 越来越多地用于分子模拟.
  • 不同化学环境或度的MLIP的可转移性是一个关键挑战.
  • 水性氧化物 (KOH) 溶液具有不同度的化学均系统.

研究的目的:

  • 对水性KOH溶液的MLIPs在度变化中的可转移性进行研究.
  • 在没有大量数据的情况下确定改善MLIP可转移性的策略.
  • 在不同的电解质条件下准确模拟氧化物运输动力学.

主要方法:

  • 开发和微调特定KOH度的MLIP.
  • 在广泛的度范围内评估MLIP性能 (力预测误差) (0.56-17.89mol L-1).
  • 对单个和多个度以及战略性选择的中间度进行训练的模型进行比较.

主要成果:

  • 在特定度上训练的模型显示转移性较差,误差从30到90 meV Å-1.
  • 在中间度 (6.26mol L-1) 上进行微调,可以在所有测试度中获得优异的可转移性.
  • 介质度模型准确地捕捉了新出现的高度现象,如氧化物-氧化物结合.

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Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry

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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid

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相关实验视频

Last Updated: Sep 9, 2025

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

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Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
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Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry

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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid

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结论:

  • 战略数据选择,特别是中间度,显著提高了MLIP在化学上相似的系统中的可转移性.
  • 这种方法提供了一个计算效率高的替代方案,用于训练各种数据集,以实现强大的MLIP性能.
  • 这些发现为开发用于电解质模拟的广泛应用的MLIP提供了实际指导方针.