first order reaction

简明释义

一级反应

英英释义

例句

1.In a typical chemical kinetics lab, we often study a first order reaction 一级反应 to understand the rate laws.

在典型的化学动力学实验室，我们经常研究一个一级反应 first order reaction 来理解反应速率定律。

2.To calculate the half-life of a first order reaction 一级反应, you can use the formula t1/2 = 0.693/k.

要计算一级反应 first order reaction 的半衰期，可以使用公式 t1/2 = 0.693/k。

3.The decay of radioactive isotopes is a classic example of a first order reaction 一级反应.

放射性同位素的衰变是一个经典的一级反应 first order reaction 的例子。

4.When analyzing enzyme kinetics, many reactions can be approximated as a first order reaction 一级反应 at low substrate concentrations.

在分析酶动力学时，许多反应可以在低底物浓度下近似为一级反应 first order reaction。

5.The rate constant for a first order reaction 一级反应 is independent of the concentration of reactants.

对于一级反应 first order reaction，速率常数与反应物的浓度无关。

作文

In the realm of chemistry, understanding reaction kinetics is crucial for predicting how substances interact over time. One fundamental concept in this field is the first order reaction, which refers to a reaction where the rate is directly proportional to the concentration of one reactant. This means that as the concentration of the reactant decreases, the rate at which the reaction occurs also decreases, leading to a predictable pattern of behavior. The mathematical representation of a first order reaction can be expressed by the equation: rate = k[A], where 'k' is the rate constant and '[A]' is the concentration of the reactant.To illustrate the significance of first order reactions, consider the example of radioactive decay. In this process, the rate at which a radioactive substance disintegrates is proportional to the amount of that substance present. This means that half-lives can be calculated, allowing scientists to determine how long it will take for a sample to reduce to half its original amount. This property is essential not only in chemistry but also in fields such as medicine and archaeology, where understanding decay rates can inform treatment plans or dating ancient artifacts.Another important aspect of first order reactions is their graphical representation. When plotting the natural logarithm of the concentration of the reactant against time, a straight line is obtained, indicating a linear relationship. This characteristic provides a straightforward method for determining the rate constant 'k' experimentally. By measuring the concentration of the reactant at various time intervals, chemists can construct this graph and derive valuable insights into the reaction kinetics.Moreover, the concept of first order reactions extends beyond simple chemical processes. In biological systems, many enzymatic reactions follow first-order kinetics under certain conditions, particularly when substrate concentrations are low. Understanding these kinetics allows biochemists to optimize conditions for enzyme activity, which is vital in various applications, from industrial processes to drug development.In conclusion, the study of first order reactions plays a pivotal role in the understanding of chemical kinetics. By recognizing the relationship between reactant concentration and reaction rate, scientists can predict the behavior of various processes, ranging from radioactive decay to enzymatic reactions. The implications of this knowledge extend far beyond the laboratory, influencing fields such as medicine, environmental science, and even archaeology. As we continue to explore the complexities of chemical reactions, the principles governing first order reactions will undoubtedly remain a cornerstone of our understanding.

在化学领域，理解反应动力学对于预测物质随时间的相互作用至关重要。这个领域中的一个基本概念是一级反应，它指的是反应速率与一种反应物的浓度成正比。这意味着当反应物的浓度降低时，反应发生的速率也会降低，从而导致可预测的行为模式。一级反应的数学表达式可以用公式表示：速率 = k[A]，其中 'k' 是速率常数，'[A]' 是反应物的浓度。为了说明一级反应的重要性，可以考虑放射性衰变的例子。在这个过程中，放射性物质的衰变速率与该物质的量成正比。这意味着可以计算半衰期，使科学家能够确定样本减少到其原始量的一半所需的时间。这一性质不仅在化学中是必不可少的，而且在医学和考古学等领域中，理解衰变速率可以为治疗方案或古代文物的定年提供信息。一级反应的另一个重要方面是它们的图形表示。当将反应物浓度的自然对数绘制与时间的关系时，会得到一条直线，表明线性关系。这一特性提供了一种简单的方法来实验性地确定速率常数 'k'。通过测量不同时间间隔下反应物的浓度，化学家可以构建这一图表并获得有价值的反应动力学见解。此外，一级反应的概念超出了简单的化学过程。在生物系统中，许多酶促反应在某些条件下遵循一级动力学，特别是在底物浓度较低时。理解这些动力学使生物化学家能够优化酶活性的条件，这在从工业过程到药物开发的各种应用中都是至关重要的。总之，对一级反应的研究在理解化学动力学中发挥着关键作用。通过认识反应物浓度与反应速率之间的关系，科学家可以预测各种过程的行为，从放射性衰变到酶促反应。这一知识的影响远远超出了实验室，影响了医学、环境科学甚至考古学等领域。随着我们继续探索化学反应的复杂性，支配一级反应的原则无疑将继续成为我们理解的基石。