atomic weight

简明释义

原子量

英英释义

例句

1.In chemistry, understanding atomic weight helps in balancing chemical equations.

在化学中，理解原子量有助于平衡化学方程式。

2.The atomic weight of hydrogen is approximately 1.008.

氢的原子量大约为1.008。

3.The periodic table lists the atomic weight of all known elements.

元素周期表列出了所有已知元素的原子量。

4.Different isotopes of an element can have different atomic weights.

同位素的原子量可能不同。

5.To calculate the molar mass, you need to know the atomic weight of each element involved.

要计算摩尔质量，您需要知道每个元素的原子量。

作文

The concept of atomic weight is fundamental to the field of chemistry and plays a crucial role in understanding the properties of elements. In simple terms, atomic weight refers to the average mass of an atom of an element, measured in atomic mass units (amu). This measurement takes into account the relative abundance of each isotope of the element, as well as their respective masses. For instance, the atomic weight of carbon is approximately 12.01 amu, which reflects the presence of both carbon-12 and carbon-13 isotopes in nature.Understanding atomic weight is essential for various applications, including stoichiometry, which is the calculation of reactants and products in chemical reactions. When chemists balance equations, they rely on the atomic weight to determine how much of each substance is needed. For example, if a chemist wants to synthesize water from hydrogen and oxygen, knowing the atomic weight of these elements allows them to calculate the precise amounts required to produce a specific quantity of water.Moreover, the atomic weight is not just a number; it also reflects the underlying structure of the atom. The protons and neutrons in the nucleus contribute significantly to the overall mass of an atom, while electrons have a negligible effect due to their much smaller mass. Therefore, when discussing atomic weight, one must consider the number of protons and neutrons present in an atom's nucleus. This relation helps scientists understand the stability of an atom and its tendency to form bonds with other atoms.In addition, the atomic weight has implications beyond individual elements. It influences the behavior of compounds formed by different elements. For example, in organic chemistry, the atomic weight of carbon plays a vital role in determining the characteristics of hydrocarbons. The varying atomic weights among different hydrocarbons can lead to significant differences in their physical and chemical properties, such as boiling points, melting points, and reactivity.Furthermore, advancements in technology have allowed for more precise measurements of atomic weight. Mass spectrometry is a technique that enables scientists to determine the atomic weight of isotopes with high accuracy. This precision is critical in fields such as pharmacology, where the exact composition of a drug can affect its efficacy and safety.In conclusion, the concept of atomic weight is integral to our understanding of chemistry. It serves as a bridge between the microscopic world of atoms and the macroscopic world of chemical reactions and compounds. By grasping the significance of atomic weight, students and professionals alike can appreciate the complexities of chemical interactions and the importance of accurate measurements in scientific research. As we continue to explore the universe at the atomic level, the role of atomic weight will undoubtedly remain a cornerstone of our scientific endeavors.

原子量的概念是化学领域的基础，对理解元素的性质至关重要。简单来说，原子量指的是一个元素原子的平均质量，以原子质量单位（amu）为单位进行测量。这一测量考虑了元素每种同位素的相对丰度及其各自的质量。例如，碳的原子量大约为12.01 amu，这反映了自然界中碳-12和碳-13同位素的存在。理解原子量对于各种应用至关重要，包括化学计量学，即计算化学反应中的反应物和产品。当化学家平衡方程式时，他们依赖于原子量来确定所需的每种物质的数量。例如，如果一位化学家想要通过氢和氧合成水，了解这些元素的原子量可以帮助他们计算出生产特定数量水所需的精确量。此外，原子量不仅仅是一个数字；它还反映了原子的基本结构。原子核中的质子和中子对原子的整体质量贡献显著，而电子由于其质量极小，对质量的影响微乎其微。因此，在讨论原子量时，必须考虑原子核中质子和中子的数量。这种关系帮助科学家理解原子的稳定性及其与其他原子形成键的倾向。此外，原子量不仅影响单个元素，还影响由不同元素形成的化合物的行为。例如，在有机化学中，碳的原子量在决定烃的特性方面起着至关重要的作用。不同烃之间的原子量变化可能导致其物理和化学性质（如沸点、熔点和反应性）的显著差异。此外，科技的进步使得对原子量的测量更加精确。质谱法是一种技术，使科学家能够以高精度确定同位素的原子量。这种精确性在药理学等领域至关重要，因为药物的确切成分可以影响其功效和安全性。总之，原子量的概念对于我们理解化学至关重要。它作为原子微观世界与化学反应和化合物宏观世界之间的桥梁。通过掌握原子量的重要性，学生和专业人士都能更好地欣赏化学相互作用的复杂性以及准确测量在科学研究中的重要性。随着我们继续在原子层面探索宇宙，原子量的角色无疑将继续成为我们科学努力的基石。