covalency

简明释义

英[kəʊˈveɪlənsi]美[koʊˈveɪlənsi]

n. [物化] 共价；共有原子价

英英释义

单词用法

同义词

反义词

例句

1.This is the homonuclear bond energy for hydrogen in pure hydrogen. There we have perfect covalency.

这是氢的同原子的共价能,在纯氢中，我们有完美的共价键。

2.This is pure covalency. This is polar covalency.

这是平均共价，它是极性共价。

3.This is the homonuclear bond energy for hydrogen in pure hydrogen. There we have perfect covalency.

这是氢的同原子的共价能,在纯氢中，我们有完美的共价键。

4.So you can see that polar covalency is a tendency towards ionic bonding.

所以你看得出极性共价就是，趋向离子键的。

5.And why did he call it polar covalency?

为什么要称它为极性共价呢？

6.The covalency of nitrogen typically allows it to form three bonds.

氮的共价性通常允许它形成三个键。

7.In organic chemistry, the covalency of carbon allows it to form diverse compounds.

在有机化学中，碳的共价性使其能够形成多样的化合物。

8.Water's unique properties can be attributed to the covalency of its hydrogen and oxygen atoms.

水的独特性质可以归因于其氢和氧原子的共价性。

9.Understanding covalency helps predict the behavior of molecules in reactions.

理解共价性有助于预测分子在反应中的行为。

10.The concept of covalency is crucial for understanding how atoms bond together.

理解原子如何结合在一起的概念对了解共价性至关重要。

作文

Covalency is a fundamental concept in chemistry that describes the way atoms bond together to form molecules. It refers to the sharing of electron pairs between atoms, which allows them to achieve stability and fulfill their valence shell requirements. In essence, 共价键 is the measure of how many pairs of electrons are shared between two atoms. Understanding 共价性 is crucial for grasping the behavior of different substances in chemical reactions and their physical properties.When we think about the formation of a molecule, we often picture atoms coming together to create something new. For example, consider water (H2O), which consists of two hydrogen atoms and one oxygen atom. The oxygen atom has six electrons in its outer shell and needs two more to complete it, while each hydrogen atom has one electron and needs one more to achieve stability. Through 共价性, these atoms share electrons, resulting in the formation of two covalent bonds. This simple illustration underscores the importance of 共价性 in creating the compounds that make up our world.Different elements exhibit varying degrees of 共价性. For instance, carbon is known for its ability to form four covalent bonds, allowing it to create complex structures like proteins and DNA. This versatility makes carbon the backbone of organic chemistry. On the other hand, noble gases, such as helium and neon, have full valence shells and typically do not engage in 共价性 bonding, which is why they are often found in their elemental forms.The concept of 共价性 also leads us to understand molecular geometry and polarity. The shape of a molecule is influenced by how atoms share electrons, which can create regions of partial positive and negative charges within the molecule. This polarity affects how molecules interact with one another, influencing boiling points, solubility, and reactivity. For example, water's polar nature allows it to dissolve many substances, making it an essential solvent in biological systems.Moreover, the study of 共价性 extends beyond simple molecules; it plays a significant role in understanding complex biological processes. Enzymes, which are proteins that catalyze biochemical reactions, rely on specific 共价性 interactions to function effectively. The precise arrangement of atoms and the covalent bonds they form determine the enzyme's shape and, consequently, its activity. Similarly, the structure of DNA, with its double helix formed through covalent bonds, is critical for genetic information storage and transmission.In conclusion, 共价性 is a key principle that underpins much of chemistry and biology. By facilitating the formation of stable molecules, it enables the vast array of chemical reactions that sustain life. A thorough understanding of 共价性 not only enhances our comprehension of scientific concepts but also enriches our appreciation for the intricate connections that define the material world around us. As we continue to explore the complexities of chemistry, the significance of 共价性 will undoubtedly remain at the forefront of our studies, illuminating the pathways through which matter interacts and transforms.

共价性是化学中的一个基本概念，描述了原子如何结合形成分子。它指的是原子之间共享电子对的方式，这使它们能够实现稳定并满足其价壳要求。本质上，共价键是两个原子之间共享多少对电子的度量。理解共价性对于掌握不同物质在化学反应中的行为及其物理特性至关重要。当我们想到分子的形成时，常常想象原子聚集在一起创造出新的东西。例如，考虑水（H2O），它由两个氢原子和一个氧原子组成。氧原子在其外壳中有六个电子，需要再两个电子来完成，而每个氢原子有一个电子，需要再一个电子以实现稳定。通过共价性，这些原子共享电子，从而形成两个共价键。这一简单的例子强调了共价性在创建构成我们世界的化合物中的重要性。不同元素表现出不同程度的共价性。例如，碳以其形成四个共价键的能力而闻名，使其能够创建复杂的结构，如蛋白质和DNA。这种多样性使碳成为有机化学的基础。另一方面，惰性气体，如氦和氖，具有完整的价壳，通常不参与共价性键合，这就是为什么它们通常以元素形式存在。共价性的概念还使我们理解分子几何和极性。分子的形状受到原子共享电子的影响，这可能在分子内产生部分正电和负电荷区域。这种极性影响分子之间的相互作用，影响沸点、溶解度和反应性。例如，水的极性使其能够溶解许多物质，使其成为生物系统中必不可少的溶剂。此外，共价性的研究超越了简单的分子；它在理解复杂的生物过程方面发挥着重要作用。酶是催化生化反应的蛋白质，依赖于特定的共价性相互作用以有效运作。原子的精确排列及其形成的共价键决定了酶的形状，从而影响其活性。同样，DNA的结构通过共价键形成的双螺旋，对于遗传信息的存储和传递至关重要。总之，共价性是支撑化学和生物学大部分内容的关键原则。通过促进稳定分子的形成，它使维持生命的大量化学反应成为可能。对共价性的透彻理解不仅增强了我们对科学概念的理解，还丰富了我们对定义我们周围物质世界的复杂联系的欣赏。随着我们继续探索化学的复杂性，共价性的重要性无疑将继续处于我们研究的前沿，照亮物质相互作用和转变的路径。