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所在平台: Udemy |
课程主页: https://www.udemy.com/course/chemical-reactions-and-equations/
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**课程名称：化学反应与方程式** **课程概述：** 本课程旨在深入探讨化学世界的变化本质。从物理变化到化学变化，课程将清晰界定两者的区别：物理变化不改变物质的化学组成，而化学变化则会重组原子，形成具有全新性质的新物质。 课程将阐述化学反应的定义——一个涉及原始物质消失、新物质生成的过程，并强调在化学反应中，旧化学键的断裂与新化学键的形成是核心要素，原子在此过程中重新排列组合。 **如何识别化学反应：** 课程还将教授学员如何通过观察来判断化学反应的发生，主要依据包括： * **温度变化：** 化学反应通常伴随着热量的吸收（吸热反应）或放出（放热反应）。 * **反应物定量关系：** 化学反应发生在特定量的反应物之间，遵循特定的化学计量关系。 这门课程将帮助您构建扎实的化学反应基础，理解物质转变的内在规律。
Everything in the world undergoes change. The change may be physical or chemical. A change is said to be physical when it does not involve change in chemical composition of the substance. But when the chemical composition of a substance is changed, the substance is said to undergo a chemical change or it is said that a chemical reaction takes place. Thus during a chemical reaction, the chemical composition of the substance is changed and new substances having new properties are formed. Thus a chemical reaction may be defined as the process in which original substances disappear and new substances are formed. In fact, during a chemical reaction, old bonds are broken and new bonds are formed. In other words, atoms are rearranged to form new substances.Chemical reaction:- The processes, in which a substance or substances undergo a chemical change to produce new substance or substances, with entire new properties, are known as chemical reaction.The nature and identity of products totally changes from the reactants. Observations which determines whether the chemical reaction has taken place or not.(a) Chemical reaction must be associated with change in temperature i.e. Heat should be either evolved or absorbed.(b)The reaction must occur between fixed quantities of the reactants.
