atomic mass

简明释义

原子质量

英英释义

例句

1.In isotopes, the atomic mass 原子质量 can vary due to the different number of neutrons.

在同位素中，由于中子数不同，原子质量 atomic mass可能会有所变化。

2.To determine the molar mass of a compound, you need to sum the atomic mass 原子质量 of all its constituent elements.

要确定化合物的摩尔质量，需要将其所有组成元素的原子质量 atomic mass相加。

3.The periodic table lists the atomic mass 原子质量 of each element, which is essential for calculations in chemistry.

周期表列出了每种元素的原子质量 atomic mass，这对化学计算至关重要。

4.Chemists often use the atomic mass 原子质量 to convert between grams and moles.

化学家常常使用原子质量 atomic mass在克和摩尔之间转换。

5.When calculating reaction yields, knowing the atomic mass 原子质量 of reactants is crucial.

在计算反应产率时，了解反应物的原子质量 atomic mass是至关重要的。

作文

Understanding the concept of atomic mass is fundamental in the field of chemistry and physics. The atomic mass of an element is a measure of the mass of its atoms, typically expressed in atomic mass units (amu). This value is crucial for various scientific calculations, including stoichiometry, which deals with the relationships between reactants and products in chemical reactions. To grasp the significance of atomic mass, we must first explore what it represents and how it is determined.The atomic mass of an element is not simply the sum of the protons and neutrons in its nucleus. Instead, it reflects the average mass of all the isotopes of that element, weighted by their natural abundance. For example, carbon has two stable isotopes: carbon-12 and carbon-13. While carbon-12 has an atomic mass of exactly 12 amu, carbon-13 has an atomic mass of approximately 13.003 amu. The atomic mass of carbon, which is about 12.01 amu, takes into account the relative abundance of these isotopes in nature.The importance of atomic mass extends beyond simple measurements; it plays a vital role in understanding chemical reactions. When substances react, they do so in fixed ratios based on their atomic mass. For instance, in the combustion of hydrocarbons, the atomic mass helps chemists calculate how much oxygen is needed to completely combust a given amount of fuel. This relationship is essential for industries such as pharmaceuticals and materials science, where precise measurements are critical.Moreover, the atomic mass is integral to the periodic table of elements. Each element is listed with its corresponding atomic mass, which provides valuable information about its properties and behaviors. Elements with similar atomic mass often exhibit similar chemical properties, which aids scientists in predicting the outcomes of reactions. For example, elements in the same group of the periodic table tend to have comparable atomic mass values and share similar valence electron configurations, leading to analogous reactivity patterns.In addition to its applications in chemistry, atomic mass also has implications in fields such as geology and astrophysics. Isotope ratios can provide insights into the age of rocks and fossils, while the atomic mass of elements found in stars helps astronomers understand the processes occurring within them. These interdisciplinary applications highlight the versatility and importance of atomic mass across various scientific domains.In conclusion, the concept of atomic mass is a cornerstone in the study of matter, influencing everything from chemical reactions to the organization of the periodic table. Its relevance spans multiple scientific disciplines, demonstrating how interconnected knowledge can lead to a deeper understanding of the universe. As students and researchers continue to explore the intricacies of atomic mass, they uncover new layers of meaning and application that enhance our comprehension of the physical world. Understanding atomic mass is not merely an academic exercise; it is a gateway to innovations and discoveries that shape our everyday lives.

理解原子质量的概念在化学和物理领域是基础。元素的原子质量是其原子质量的度量，通常以原子质量单位（amu）表示。这个数值对于各种科学计算至关重要，包括化学反应中的反应物和产品之间的关系，即化学计量学。要掌握原子质量的重要性，我们必须首先探讨它所代表的意义以及如何确定。元素的原子质量不仅仅是其原子核中质子和中子的总和。相反，它反映了该元素所有同位素的平均质量，按其自然丰度加权。例如，碳有两个稳定同位素：碳-12和碳-13。虽然碳-12的原子质量恰好为12 amu，但碳-13的原子质量约为13.003 amu。碳的原子质量约为12.01 amu，考虑了这些同位素在自然界中的相对丰度。原子质量的重要性不仅限于简单的测量；它在理解化学反应中发挥着至关重要的作用。当物质反应时，它们以固定的比例反应，这些比例基于它们的原子质量。例如，在烃的燃烧中，原子质量帮助化学家计算完全燃烧给定量燃料所需的氧气。这种关系对制药和材料科学等行业至关重要，在这些行业中，精确的测量至关重要。此外，原子质量是元素周期表的核心。每个元素都列出了其对应的原子质量，这提供了有关其性质和行为的宝贵信息。具有相似原子质量的元素通常表现出相似的化学性质，这有助于科学家预测反应的结果。例如，周期表中同一组的元素往往具有可比的原子质量值，并共享类似的价电子配置，从而导致类似的反应性模式。除了在化学中的应用，原子质量在地质学和天体物理学等领域也有影响。同位素比率可以提供关于岩石和化石年龄的见解，而在恒星中发现的元素的原子质量帮助天文学家理解其中发生的过程。这些跨学科的应用突显了原子质量在多个科学领域的多样性和重要性。总之，原子质量的概念是物质研究的基石，影响着从化学反应到元素周期表的组织。它的相关性跨越多个科学学科，展示了知识如何相互关联，从而加深我们对宇宙的理解。随着学生和研究人员继续探索原子质量的复杂性，他们揭示了新的意义和应用层面，增强了我们对物理世界的理解。理解原子质量不仅仅是学术练习；它是通向塑造我们日常生活的创新和发现的门户。