|
所在平台: Udemy |
课程主页: https://www.udemy.com/course/redox-reactions-j/
课程评论：没有评论
**课程名称：氧化还原反应** **课程概述：** 本课程深入探讨氧化还原反应，这是一种化学反应，其中氧化和还原同时发生。课程将从基本概念入手，解释氧化（通常涉及氧的增加或氢的失去）和还原（通常涉及氢的增加或氧的失去）。 **核心知识点：** * **电子转移概念：** 课程将重点介绍氧化还原反应的电子转移本质。氧化被定义为原子或离子失去电子的过程，而还原是原子或离子获得电子的过程。 * **氧化剂与还原剂：** 课程将阐明在氧化还原反应中，失去电子的物质被称为还原剂（或还原物），而获得电子的物质被称为氧化剂（或氧化物）。 * **水溶液中的氧化还原反应：** 课程将特别关注水溶液中氧化还原反应的进行方式，包括直接和间接反应。 * **直接氧化还原反应：** 课程将详细解释直接氧化还原反应，即氧化和还原发生在同一容器内的反应。在这种情况下，电子的转移距离非常短，几乎是瞬间完成的。 * **实例分析：** 课程将通过一个典型的例子——将锌棒放入硫酸铜溶液中，来具体展示直接氧化还原反应的发生过程及相应现象，例如： * 锌棒质量逐渐减轻 * 溶液蓝色逐渐变浅 * 铜析出并沉积在锌棒上或沉于杯底 * 该反应是放热反应 * 溶液始终保持电中性 * 反应不会无限进行，会在一定时间后停止 **课程内容结构：** 本课程内容围绕氧化还原反应的定义、电子转移机制、氧化剂与还原剂的角色，以及在水溶液中的直接与间接反应模式展开，并通过具体实验现象加深理解。
Redox reactions are the chemical reactions in which reduction and oxidation occurs simultaneously. In straight words addition of oxygen is oxidation and removal of hydrogen is reduction.ELECTRONIC CONCEPT OF OXIDATION AND REDUCTIONOxidation is a process in which an atom or an ion loses one or more electrons.Reduction is a process in which an atom or an ion gains one or more electrons.REDOX REACTIONRedox reactions may be regarded as electron transfer reactions in which the electrons are transferred from one reactant to the other. As the result substance which losses electrons is called a reducing agent or reductant while another which accepts the electrons is called an oxidizing agent or oxidant.REDOX REACTIONS IN AQUEOUS SOLUTIONIn aqueous solutions, the spontaneous redox reactions can be carried out directlyas well as indirectly.Direct Redox Reactions: Redox reactions in which oxidation and reduction takes place in the same vessel are called direct redox reactions. In such reactions, thetransfer of electrons from reductant to oxidant occurs over a very short distance(within molecular diameters). For example, if a zinc rod is placed in a solution ofcopper sulphate in a beaker, a spontaneous reaction occurs and following changeswill be observed.Observations for redox reaction occurring in a beakerZinc rod starts dissolving and loses its mass gradually.The blue color of the solution starts fading.Copper metal either starts settling at the bottom of the beaker or depositing on thezinc rod.The reaction is exothermic i.e., it takes place with the evolution of heat.The solution remains electrically neutral throughout.The reaction will not continue indefinitely but stops after some time.
