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相关概念视频

Halogens03:01

Halogens

18.5K
Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. Astatine is a highly unstable radioactive element, so currently, most of its properties are unknown due to its short half-life. Tennessine is a synthetic element also predicted to be in this group. 
18.5K
Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility02:34

Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility

44.3K
Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
44.3K
Intermolecular Forces and Physical Properties02:56

Intermolecular Forces and Physical Properties

20.8K
20.8K
Intermolecular vs Intramolecular Forces03:00

Intermolecular vs Intramolecular Forces

87.2K
Intermolecular forces (IMF) are electrostatic attractions arising from charge-charge interactions between molecules. The strength of the intermolecular force is influenced by the distance of separation between molecules. The forces significantly affect the interactions in solids and liquids, where the molecules are close together. In gases, IMFs become important only under high-pressure conditions (due to the proximity of gas molecules). Intermolecular forces dictate the physical properties of...
87.2K
Hydrogen Bonds01:04

Hydrogen Bonds

8.4K
A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
8.4K
Radical Formation: Homolysis00:54

Radical Formation: Homolysis

3.6K
A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
3.6K

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Continuous Flow Chemistry: Reaction of Diphenyldiazomethane with p-Nitrobenzoic Acid
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横向化学 横向化学

Michelle DiMeo1, Andrew Gregory2, Frank A J L James2

  • 1Science History Institute.

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概括
此摘要是机器生成的。

布鲁姆斯伯里学术出版了广泛的"文化历史"系列,提供了一个结构化的方法来研究不同历史时期和主题的文化. 这种收藏方便了对文化主题的双重和同步分析.

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科学领域:

  • 文化研究 文化研究
  • 历史 历史 历史 历史 历史
  • 出版 出版 出版 出版 出版

背景情况:

  • 雷蒙德·威廉姆斯在1976年注意到了"文化"这个词的复杂性.
  • 布卢姆斯伯里学术出版社自2000年代以来出版了大约40个系列的"文化历史",还有50个计划.
  • 每个系列包括六卷,理论上涵盖不同的历史时期.

研究的目的:

  • 分析布鲁姆斯伯里学术的"文化历史"系列的结构和范围.
  • 评估系列主题和时间序列组织的教学和研究实用性.
  • 突出该系列所促进的跨学科和跨时代文化研究的创新方法.

主要方法:

  • "文化史"系列结构和卷数分布的内容分析.
  • 检查系列的时间和主题组织.
  • 评估Bloomsbury网站上可用的电子文本的可访问性和实用性.

主要成果:

  • 该系列系统地涵盖了从古代到现代的主要历史时期.
  • "水平" (跨时间) 和"垂直" (跨主题) 阅读的潜力是固有的系列设计.
  • 通过电子文本的数字访问增强了对比研究系列的可用性.

结论:

  • 布鲁姆斯伯里的"文化史"提供了一个全面而结构化的资源,用于探索文化历史.
  • 系列设计支持多方面的历史和文化调查方法.
  • 该系列的数字整合增强了其对学术研究和教育的价值.