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所在平台: Udemy |
课程主页: https://www.udemy.com/course/learn-chemical-kinetics/
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# 课程总结：学习化学动力学 本课程由 Coursera 提供，名为“学习化学动力学”。 ## 课程概述 化学反应是将反应物转化为产物的过程。虽然化学方程式提供了计算产物产量的定量工具，但它无法揭示反应的三个关键动态方面： 1. **反应速率：** 反应在给定时刻的进行速度。 2. **反应终点：** 反应完成后反应物和产物的浓度。 3. **反应方向与能量：** 反应是否自发进行并释放能量，或需要能量才能进行。 本课程重点关注 **化学动力学**，即研究反应速率及其机理——反应物转化为产物的逐步变化过程。 化学平衡决定了反应进行的程度，而热力学（ΔG < 0）则预测反应的可行性。然而，自由能变化的数据并不能告诉我们反应的速率以及影响其速率的因素。 课程将探讨以下关键问题： * 为什么有些反应缓慢而有些瞬间发生？ * 化学家如何测量、比较和表达化学反应的速率？ * 化学家能否预测和控制化学反应的速率？ 无论是药物的作用速度、血液凝结时间，还是水泥硬化或聚乙烯形成的速率，都对我们的生活和生产具有重要意义。**化学动力学** 正是解答这些关于化学反应速度和影响因素的学科。 ## 课程特色 * 专注于化学反应的关键动态方面之一：反应速率。 * 解释如何量化和理解反应速度。 * 通过实例说明化学动力学在医药、工业等领域的实际应用。 **注意：** 本课程的教学大纲（Syllabus）为“无”。
A chemical change involves changing reactants to products. A balanced equation is an essential quantitative tool for calculating product yields from reactant amounts, but it tells us nothing about three dynamic aspects of the reaction, which are essential to understanding chemical change. For any chemical reaction, chemists try to find out1. How fast is the reaction proceeding at a given moment?2. What will be the reactant and product concentrations when the reaction is complete?3. Will the reaction proceed by itself and release energy, or will it require energy to proceed?This lecture addresses the first of these questions and focuses on the field of kinetics, which deals with the speed of a reaction and its mechanism, the stepwise changes that reactants undergo in their conversion to products.The extent to which a reaction will proceed can be determined from chemical equilibrium whereas the feasibility of a chemical reaction can be predicted by thermodynamics (DG < 0). The knowledge of free energy change of a reaction however gives us no idea about the rate and the factors controlling the rate of a reaction.For example,Why do some reactions occur slowly while others seem to take placeinstantaneously?How does chemist's measure, compare and express the rates at which chemical reactions occur?Can chemists predict and control the rate of a chemical reaction?How quickly a chemical reaction occurs is a crucial factor in how the reaction affects its surroundings. Therefore, knowing the rate of a chemical reaction is integral to understanding the reaction. For example,How quickly a medicine acts or blood clots can make the difference between life and death.How long it takes for cement to harden or polyethylene to form can make the difference between profit and loss.All these questions can be answered by the branch of chemistry known asChemical kinetics.
