equivalent; equivalent weight

简明释义

当量

英英释义

例句

1.In chemistry, the concept of equivalent 当量 is crucial for understanding reactions.

在化学中，equivalent 当量 的概念对于理解反应至关重要。

2.In titration, the equivalent weight 当量重量 helps determine how much reagent is needed.

在滴定中，equivalent weight 当量重量 有助于确定所需试剂的量。

3.The equivalent weight 当量重量 of a substance can be calculated using its molar mass.

物质的 equivalent weight 当量重量 可以通过其摩尔质量计算得出。

4.The equivalent 当量 of an acid can be different depending on its dissociation.

酸的 equivalent 当量 可能因其解离而不同。

5.To perform the reaction correctly, you need to know the equivalent 当量 of each reactant.

为了正确进行反应，您需要知道每种反应物的 equivalent 当量。

作文

In the study of chemistry, the concept of equivalent plays a crucial role in understanding chemical reactions and stoichiometry. The term equivalent refers to the amount of a substance that can react with or replace one mole of hydrogen atoms in a reaction. This idea is essential for calculating the equivalent weight of various compounds, which is defined as the mass of a substance that combines with or displaces 1 mole of hydrogen or 8 grams of oxygen. Understanding equivalent weight is vital for chemists as it allows them to determine the proportions of reactants needed in a chemical reaction.For instance, when dealing with acids and bases, knowing the equivalent of an acid can help in neutralization reactions. If we take sulfuric acid (H2SO4) as an example, its equivalent weight can be calculated based on its ability to donate protons (H+ ions). Since sulfuric acid can donate two protons, its equivalent weight is half of its molar mass. This means that for every mole of sulfuric acid, there are two moles of hydrogen ions available for reaction, thus making it a strong acid.Moreover, the concept of equivalent is not limited to acids and bases; it extends to redox reactions as well. In these reactions, the equivalent weight of an oxidizing or reducing agent is determined by the number of electrons it can accept or donate. For example, in the case of potassium permanganate (KMnO4), the equivalent weight can vary depending on the acidity of the solution in which it is used, as it can undergo different reductions.In practical applications, understanding equivalent and equivalent weight is essential for industries that rely on chemical processes. For instance, in pharmaceuticals, precise dosages of active ingredients are required for effective treatment. Knowing the equivalent of each component ensures that the correct amount is administered, maximizing efficacy while minimizing side effects.Additionally, environmental science often employs the concepts of equivalent and equivalent weight to assess the impact of pollutants. When evaluating the toxicity of chemicals, scientists may refer to their equivalent amounts to gauge potential harm to ecosystems. By understanding how much of a pollutant is equivalent to a certain amount of a more harmful substance, regulations can be better formulated to protect public health and the environment.In conclusion, the terms equivalent and equivalent weight are fundamental in the field of chemistry. They provide a framework for understanding the relationships between different substances in a reaction, allowing chemists to make accurate calculations and predictions. Whether in laboratory settings, industrial applications, or environmental assessments, the significance of equivalent and equivalent weight cannot be overstated. Mastering these concepts is essential for anyone looking to delve deeper into the world of chemistry and its practical implications in our daily lives.

在化学研究中，等效的概念在理解化学反应和化学计量学中起着至关重要的作用。等效这个术语指的是能够与或替代一个摩尔氢原子反应的物质的量。这个概念对于计算各种化合物的当量重量至关重要，当量重量被定义为与或替代1摩尔氢或8克氧结合的物质的质量。理解当量重量对化学家来说是非常重要的，因为它使他们能够确定化学反应中所需的反应物比例。例如，在处理酸和碱时，知道酸的等效可以帮助中和反应。如果我们以硫酸（H2SO4）为例，可以根据其能释放的质子（H+离子）计算其当量重量。由于硫酸可以释放两个质子，因此其当量重量是其摩尔质量的一半。这意味着每摩尔硫酸中有两个氢离子可用于反应，从而使其成为一种强酸。此外，等效的概念不仅限于酸和碱；它还扩展到氧化还原反应。在这些反应中，氧化剂或还原剂的当量重量是通过它能接受或捐赠的电子数量来确定的。例如，在高锰酸钾（KMnO4）的情况下，其当量重量可能会根据使用的溶液的酸度而变化，因为它可以经历不同的还原。在实际应用中，理解等效和当量重量对依赖化学过程的行业至关重要。例如，在制药行业，要求活性成分的精确剂量以实现有效治疗。了解每个组分的等效确保了正确的剂量被施用，从而最大化疗效，同时最小化副作用。此外，环境科学通常利用等效和当量重量的概念来评估污染物的影响。当评估化学物质的毒性时，科学家可能会参考其等效量来衡量对生态系统的潜在危害。通过理解某种污染物的多少与某种更有害物质的等效量，可以更好地制定保护公众健康和环境的法规。总之，等效和当量重量这两个术语在化学领域是基础性的。它们提供了理解反应中不同物质之间关系的框架，使化学家能够进行准确的计算和预测。无论是在实验室环境、工业应用还是环境评估中，等效和当量重量的重要性都不容小觑。掌握这些概念对于任何想要深入探索化学及其在我们日常生活中的实际影响的人来说都是必不可少的。