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所在平台: Udemy |
课程主页: https://www.udemy.com/course/chemical-equilibrium-v/
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课程名称：化学平衡 课程概述：本课程探讨化学反应在封闭容器中进行的事实，即大多数过程并不会完全结束，而是会在某种程度上留下一定量的反应物和产物。当化学反应达到某种状态时，称之为平衡状态。平衡代表了一个过程的状态，其中系统的温度、压力、浓度等属性随时间的推移不再发生变化。所有达到平衡的过程都涉及两个相对立的过程。当这两个相对立的过程的速率相等时，就达到了平衡。如果涉及的相对立过程仅是物理变化，则称为物理平衡；如果相对立的过程是化学反应，则称为化学平衡。 例如，当你在一个容器中加入越来越多的盐，并用玻璃棒搅拌，直到某种量的盐溶解后，就会发现无论再添加多少盐，盐都不再溶解，而是沉淀到底部。此时，溶液被称为饱和状态，并处于平衡状态。在这个阶段，未溶解的盐分子会以溶解的方式进入溶液（溶解过程），而同样数量的溶解盐又会以沉淀的方式沉淀下来（沉淀过程）。因此，在平衡状态下，溶解速率与沉淀速率相等。 课程大纲：无
It is an experimental fact that most of the process including chemical reactions, whencarried out in a closed vessel, do not go to completion. They proceed to some extent leaving considerable amounts of reactants & products. When such stage is reached in a reaction, it is said that the reaction has attained the state of equilibrium. Equilibriumrepresents the state of a process in which the properties like temperature, pressure, concentration etc. of the system do not show any change with passage of time. In all processes which attain equilibrium, two opposing processes are involved. Equilibrium is attained when the rates of the two opposing processes become equal.If the opposing processes involve only physical changes, the equilibrium is called Physical Equilibrium. If the opposing processes are chemical reactions, the equilibrium is called Chemical Equilibrium.If you add more and more salt in water taken in a container of a glass and stirredwith a glass rod, after dissolving of some amount. You will find out no furthersalt is going to the solution and it settles down at the bottom. The solution is nowsaid to be saturated and in a state of equilibrium. At this stage, many molecule ofsalt from the undissolved salt go into the solution (dissolution) and same amountof dissolved salt are deposited back (Precipitation).Thus, at equilibrium rate of dissolution is equal to rate of precipitation.
