质量守恒定律是初中化学重要的定律,理解和掌握该定律可以解决一些化学计算等问题,下面作一简单介绍。一、运用质量守恒定律来解释一些化学反应中物质质量的“增重”与“减轻”现象例1木炭在空气中燃烧后质量减轻了。解析:木炭燃烧是木炭和氧气点燃生成二氧化碳,根据质量守恒定 The law of conservation of mass is an important law for junior high school chemistry. Understanding and mastering this law can solve some problems of chemical calculations. The following is a brief introduction. First, use the law of conservation of mass to explain the “weight gain” and “lightening” phenomena of the mass of substances in some chemical reactions. Example 1 The quality of charcoal in the air is reduced. Analysis: Charcoal combustion is charcoal and oxygen ignite to generate carbon dioxide, according to the quality of conservation