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判断“化学变化”与“物理变化” ,只要抓住化学变化的本质特征 ,找出物理变化与化学变化的区别与联系 ,就能作出正确的判断。化学变化的本质特征是 ,变化时都生成了其它物质 ,是判断化学变化的依据。物质反应、物料燃烧 ,物质腐烂、变质、老化等 ,都生成了其它物质都是化学变
Judging “chemical changes” and “physical changes”, we can make correct judgments by grasping the essential characteristics of chemical changes and finding out the differences and connections between physical changes and chemical changes. The essential characteristic of chemical changes is that other substances are generated when they change, and they are the basis for judging chemical changes. Material reactions, material burning, material rot, deterioration, aging, etc.