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本单元在已学习了两种常见化学物质空气、水的基础上,初步认识元素符号、化合价、化学式等化学用语,充分了解学习化学的工具和手段,开始了化学方程式的实际应用,重点讲述质量守恒定律及其应用,介绍化学方程式的表示意义、书写原则、配平方法和有关简单计算,化学方程式是整个化学课程中研究化学反应的化学用语工具,更是初中化学难度系数最大的重点知识。课题1质量守恒定律知识点1:质量守恒定律的理解
On the basis of studying air and water of two common chemical substances, this unit initially understands the chemical symbols such as element symbols, valences and chemical formulas, fully understands the learning chemistry tools and tools, starts the practical application of chemical equations, and focuses on the quality Conservation law and its application, introduce the meaning of the chemical equation, writing principle, trim method and simple calculation. Chemical formula is a chemical language tool for chemical reaction in the whole chemistry course. It is also the key knowledge of the chemical degree of difficulty in junior high school. Question 1, the law of conservation of mass Knowledge point 1: the understanding of the law of conservation of mass